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Englebright Reservior

Englebright Lake Drilling Project 3

Charles N. Alpers and Lorraine E. Flint  U.S. Geological Survey

Noah P. Snyder  Boston College

Englebright Lake Drilling Project 3

Figure 2 – GLAD200 drilling platform on Englebright Lake

During May-June 2002, DOSECC and the U.S. Geological Survey collaborated on research drilling at Englebright Lake, a 70,000 acre-foot reservoir built in 1941 on the Yuba River in the northwestern Sierra Nevada of California. The drilling at Englebright Lake was part of the Upper Yuba River Studies Program, a multi-disciplinary, multi-agency effort with the overall purpose of addressing the following question:

“To determine if the introduction of wild chinook salmon and steelhead to the Upper Yuba River watershed is biologically, environmentally, and socio-economically feasible over the long term.”

Specific to Englebright Lake, the main project goal was to characterize reservoir sediments with regard to grain-size distribution and mercury concentration so that the possible effects of dam removal and sediment release downstream could be assessed. The work was funded by the Resources Agency of the State of California under the California Bay-Delta Program (CALFED) and by the U.S. Geological Survey.

Englebright Lake Drilling Project 1

Figure 1 – Location map and sampling sites

In all, 335 meters of core were collected, primarily using hydraulic piston methods. Average recovery was 86%. Thirty holes were drilled at seven locations – at six of the locations, complete sections through the reservoir bed sediment deposits were achieved. Sediment thickness ranged from 6 m near Englebright Dam to 33 m in the mid-reservoir area. Before splitting, cores were analyzed for magnetic susceptibility, bulk density (neutron log), and gamma radiation. After splitting, digital photographs were taken and archived along with descriptive information.

One set of subsamples were taken immediately for analysis of methylmercury (frozen for preservation), moisture content, and loss on ignition (organic content). After all cores were logged and stratigraphic correlations were determined, a second, more detailed round of subsampling resulting in a vertically continuous section at each location was done, for analysis of grain-size distribution, total mercury, and other trace metals. Selected subsamples were used for geochronology (210Pb and 137Cs).

Results of grain-size distribution and loss on ignition for 561 samples were used to extrapolate from one-dimensional vertical sections of sediment sampled in cores to entire three dimensional volumes of the reservoir deposit. In this manner, the mass of the reservoir sediment deposit was estimated to be 26 x 106 metric tons of material, of which 64.7 to 68.5% was sand and gravel and the remainder was silt and clay.

Total mercury concentrations in unsieved sediment increased with decreasing distance from the dam, following a trend toward finer grained sediment. Average mercury concentrations of samples rich in silt and clay was about 300 nanograms per gram (ng/g, or parts per billion, ppb), whereas average Hg in sand-gravel-rich samples was about 12 ng/g (or ppb).

The successful drilling of complete post-reservoir sediment profiles at Englebright Lake allowed the USGS to make the first quantitative assessment of the total mass of mercury contained within a foothill reservoir in a watershed greatly impacted by historical gold mining. Based on available information, about 2.3×106 kg of mercury were lost to the environment in the Yuba River watershed in association with historical gold mining. The estimated total mass of mercury in Englebright lake sediments (accumulated from 1941 to 2002) is 2,500 to 2,800 kg, which represents about 0.1% of the total amount of Hg estimated to have been lost to the environment during historical gold mining in this watershed.

Results of this project will play a significant role in determining the potential impacts of the removal of Englebright Dam on downstream environments. Also, the core samples from Englebright Lake represent an archive of the history of sediment transport and deposition processes in the Yuba River watershed over more than six decades, and are a potential resource to future researchers investigating watershed transport processes.

References:

Alpers, C.N., Antweiler, R.A., Snyder, N.P., and Curtis, J.A., in review, Mercury transport and deposition in a watershed affected by historical gold mining: the upper Yuba River, California. Journal article for Water Resources Research.

Alpers, C.N., Hunerlach, M.P., Marvin-DiPasquale, M.C., Antweiler, R.C., Lasorsa, B.K., De Wild, J.F., and Snyder, N.P., 2006, Geochemical Data for Mercury, Methylmercury, and Other Constituents in Sediments from Englebright Lake, California, 2002: U.S. Geological Survey Data Series 151, 95 p. http://pubs.water.usgs.gov/ds151/

Snyder, N.P., and Hampton, M.A., 2003, Preliminary cross section of Englebright Lake sediments, U.S. Geological Survey Open-File Report 03-397, 1 plate. http://geopubs.wr.usgs.gov/open-file/of03-397/

Snyder, N.P., Alpers, C.N., Flint, L.E., Curtis, J.A., Hampton, M.A., Haskell, B.J., and Nielson, D.L., 2004a, Report on the May-June 2002 Englebright Lake deep coring campaign:  U.S. Geological Survey Open-File Report 2004-1061, 32 p. plus 10 plates. http://pubs.usgs.gov/of/2004/1061/

Snyder, N.P., Allen, J.R., Dare, C., Hampton, M.A., Schneider, G., Wooley, R.J., Alpers, C.N., and Marvin-DiPasquale, M.C., 2004b, Sediment grain-size and loss-on-ignition analyses from 2002 Englebright Lake coring and sampling campaigns:  U.S. Geological Survey Open-File Report 2004-1080, 46 p. http://pubs.usgs.gov/of/2004/1080/

Snyder, N.P., Rubin, D.M., Alpers, C.N., Childs, J.R., Curtis, J.A., Flint, L.E., and Wright, S.A., 2004c, Estimating rates and properties of sediment accumulation behind a dam: Englebright Lake, Yuba River, northern California, Water Resources Research, v. 40, W11301, doi:10.1029/2004WR003279 http://www2.bc.edu/~snyderno/snyder_etal_2004.pdf

Snyder, N.P., Wright, S.A., Alpers, C.N., Flint, L.E., Holmes, C.W., and Rubin, D.M., 2006, Reconstructing depositional processes and history from reservoir stratigraphy: Englebright Lake, Yuba River, northern California, Journal of Geophysical Research, v. 111, F04003, doi:10.1029/2005JF000451. http://www.agu.org/journals/jf/jf0604/2005JF000451/ http://www2.bc.edu/~snyderno/snyder_etal_2006.pdf

Englebright Lake Drilling Project 2

 

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Lake Titicaca

Lake Titicaca Scientific Core Drilling Project

Lake Titicaca Drilling Project

P.A. Baker Duke University

S.C. Fritz University of Nebraska

G.O. Seltzer Syracuse University

 

Lake Titicaca is a high-elevation (3812 m) lake in the tropical Andes of Bolivia and Peru and was drilled in April/May 2001 using the GLAD 800 drilling platform and coring system (Figure 1). This site is critical for reconstructing the history of the South American summer monsoon system and how long-term variation in effective moisture in the tropical Andes is affected by variation of global-scale glacial boundary conditions, orbitally produced changes in seasonal insolation, and changes in tropical Pacific and/or Atlantic sea-surface temperature. Over 625 m of mud was recovered from paired overlapping holes in three locations. The longest recovered sequence spans 136 m and consists of alternations between two primary lithologic units, indicative of four major glacial stages and the intervening interglacials.

 

Lake Titicaca Drilling

Figure 1 – GLAD800 drilling platform on Lake Titicaca

Generally, the intervals of increased glaciation were periods when Lake Titicaca was deep and fresh and therefore times of high effective moisture and likely high precipitation (based on calcium carbonate concentrations, diatom stratigraphy, and d13C isotopic measurements on bulk organic carbon). A chronology based on radiocarbon, U-series ages on aragonite laminae, and tuning to the Vostok CO2 record suggests that the drilled sequence extends over approximately the last 370,000 years. Extrapolation of the radiocarbon chronology suggests that the most recent period of ice expansion in the cordillera surrounding the lake began approximately 60,000 14C yr BP, following a major dry interval. A series of U-series dates on discrete aragonite layers suggests that the penultimate low stand of Lake Titicaca, rather than dating to the last summer solar minimum (~32,000 yr BP), is coincident with MIS5e, the penultimate interglacial stage (~125,000 yr BP). This suggests that the water balance of the lake is as strongly influenced by global-scale (an tropical) temperature changes and boundary conditions as by precession forcing of the South American summer monsoon.

Lake Titicaca Drilling1

Figure 2 – Drilling log and lithology of Lake Titicaca borehole 2B.

Read more about this scientific core drilling services project at ICDP.

References:

Baker, P.A. and S.C. Fritz. High-resolution records and mechanisms of climate variability in tropical South America…and beyond. IODP-ICDP Workshop: Acquiring high to ultra-high resolution geological records of past climate change by scientific drilling, October 2008, Potsdam, Germany.

Baker, P.A., S.C. Fritz, C.A. Rigsby, S.A Burns, K.Coley, E. Ekdahl. “Millennial Climate Variability in Tropical South America”. American Geophysical Union, San Francisco, December 2005.

Baker, P.A., S.C. Fritz, G.O. Seltzer, & C. Rigsby. Tropical climate dynamics in the South American Altiplano. AGU Annual Meeting, San Francisco, December 2003.

Baker, P.A., S.C. Fritz, G.O. Seltzer, C. Rigsby, S. Cross, M. Grove, A. Ballantyne. “Climates of tropical South America: past, present, and future” European Geophysical Union, Vienna, April 2007.

Baker, P.A., S.C. Fritz, G.O. Seltzer, K. Arnold, & P. Tapia. Geochemical and diatom records of hydrologic variability in the tropical Andes during the late Quaternary from drill cores of Lake Titicaca. AGU, San Francisco, December 2002. EOS Trans. 83: F896.

Baker, PA, S C Fritz, G O Seltzer, A P Ballantyne, C A Rigsby. The Terrestrial Paleoclimatic Record of the Late Quaternary as Revealed by Drilling Lake Titicaca, Peru/Bolivia. American Geophysical Union, San Francisco, December 2004

Ekdahl, E J, S C Fritz, L R Stevens, P A Baker, G O Seltzer. A High-Resolution Biogenic Silica Record From Lake Titicaca, Peru-Bolivia: South American Millennial-Scale Climate Variability From 18-60 Kya. American Geophysical Union, San Francisco, December 2004.

Ekdahl, E., Fritz, S.C., Baker, P.A., Burns, S.A., Coley, K., Rigsby, C.A. “Multi-Decadal to Millennial Scale Holocene Hydrologic Variation in the Southern Hemisphere Tropics of South America”. American Geophysical Union, San Francisco, December 2005.

Fritz, S.C., P.A. Baker, E. Ekdahl, S. Burns, “Holocene multi-decadal to millennial-scale hydrologic variability on the South American Altiplano”, American Geophysical Union, San Francisco, December 2006.

Fritz, S.C., P.A. Baker, G.O. Seltzer, A. Ballantyne, P. Tapia, H. Cheng, R.L. Edwards. 2007. Quaternary glaciation and hydrologic variation in the South American tropics as reconstructed from the Lake Titicaca drilling project. Quaternary Research 68: 410-420.

Fritz, S.C., P.A. Baker, G.O. Seltzer, E. Ekdahl, “Glaciation and hydrologic variation in the South American tropics during the last 400,000 yr”. American Geophysical Union, San Francisco, December 2005.

Fritz, S.C., P.A.Baker, G.O. Seltzer. “Late Quaternary hydrologic variability in the southern tropical Andes and its relationship to the adjoining Amazon Basin and major climate drivers”, International Quaternary Association Congress, Cairns, Australia, August 2007.

Fritz, S.C., T. Johnson, P.A. Baker, S. Colman, W. Dean, J. Peck. 2006. Large-lake drilling projects supported by the US National Science Foundation Earth Systems History Program. PAGES News 14: 19-20.

Seltzer, G.O., P.A. Baker, S.C. Fritz, D. Rodbell, & B. Valero. The record of tropical glaciation from drill cores from Lake Titicaca, Bolivia/Peru. Geological Society of America, Seattle, November 2003.

Seltzer, G.O., P.A. Baker, S.C.Fritz, K. Arnold, A. Ballantine, P. Tapia, & C. Veliz. A long record of tropical glaciation and climate change in drill cores from Lake Titicaca. AGU, San Francisco, December 2001. EOS Trans. 82: F757.

Seltzer, G.O., S.C. Fritz, P.A. Baker. A >100 kyr record of glaciation from the southern tropical Andes. AGU San Francisco, December 2002. EOS Trans. 83: F896.

Partial listing of presentations:

Fritz, S.C. – Invited University presentations:

2008: Braunschweig University (Geology)

2007: Kansas State University (Geology), University of Adelaide, Australia (Geography), University of Edinburgh (Geosciences), CEREGE, Aix-en-Provence, France

2006: Queens University, Kingston, ON (Biological Sciences), University (Environmental Sciences), Louisiana State University (Geology)

2005: Lehigh University (Earth & Environmental Sciences), Iowa State University (Earth & Atmospheric Sciences)

University of Iowa (Geology), Geological Survey of Denmark and Greenland

Data are archived at http://www.ncdc.noaa.gov/paleo/data.html

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Chicxulub Impact Structure 2001

Chixculub scientific core drilling project

Toward a Sequence Stratigraphy of the Chicxulub Impact Basin Infill

Michael T. Whalen and Zulmacristina F. Pearson  University of Alaska Fairbanks

Sean P. Gulick University of Texas at Austin

 

Co-PIs Michael Whalen and Sean Gulick were funded in 2005 under a pre-drilling activity proposal to conduct stratigraphic analysis of the Yaxcopoil-1 (Yax-1) core and investigate the relationship of the core to offshore 2D seismic data to provide insight into the Tertiary infilling history of the Chicxulub impact basin. High-resolution logging of approximately 400 m of Tertiary carbonate-dominated sedimentary rocks in Yax-1 (Dressler et al., 2003) provides details of the lithostratigraphy and biostratigraphy and permits a preliminary sequence stratigraphic analysis of the post-impact succession in the basin. Approximately 290 samples were collected for petrographic, x-ray diffraction and biostratigraphic analyses. Analysis of offshore 2D seismic data provides a broader view of the process of Tertiary basin infilling and the history of Yucatàn carbonate platform development.

Chicxulub Impact Basin

Figure 1. Interpreted seismic line from the northeast portion of the crater illustrating the position of the K/T boundary and six overlying seismic units. Note the two sets of prograding clinoforms in seismic Unit C. Inset is a photograph from sequence 3, ~640 m Yax-1 core, illustrating graded turbidites that may be similar to the deposits making up toes of prograding clinoforms in seismic Unit C. Modified from Pearson et al. (2006).

 

Ten lithofacies were categorized into two broad groups: redeposited and background facies that occur in 5 lithostratigraphic units. Redeposited facies include carbonate supportstones of a wide array of grain sizes and finer-grained facies with evidence of soft sediment deformation, all of which were deposited by a variety of gravity flow mechanisms. Background facies include fine-grained argillaceous and clean limestones that were deposited mainly from suspension, below storm wave base, at depths ranging from bathyal to neritic. Depositional environments range from a deep-water, steep slope inside the Chicxulub crater rim to outer carbonate ramp neritic environments that were established once the Yucatàn platform had prograded seaward.

Five depositional sequences were identified based on transgressive and maximum flooding surfaces and facies stacking patterns. Biostratigraphic data remains equivocal but indicate that the first 3 sequences range from Early Paleocene to Early Eocene in age. The base of sequences 1 through 4 contain coarse-grained redeposited carbonates interpreted as lowstand gravity-flow deposits, while the highstand of sequence 3 records the first evidence of relatively fine-grained turbidite deposits that we interpret as the initial record of Yucatàn platform progradation into the Chicxulub basin (Fig. 1). Sequences 4 and 5 consist mainly of background and fine-grained redeposited facies but by the top of sequence 4 indicate that the Yucatàn platform slope and outer ramp had prograded over the position of the Yax-1 core. The upper portion of sequence 3 and lower sequence 4 appear to straddle the Paleocene-Eocene boundary. A series of soft sediment deformed units in sequence 3 may have been deposited in response to events associated with the Paleocene-Eocene thermal maximum; however, better biostratigraphic control will be necessary to test this hypothesis.

Six seismic units were identified, the lower 5 of which appear to roughly correlate with the 5 sequences in the Yax-1 core (Fig. 1). The geometry and distribution of seismic units A and B are strongly controlled by the morphology of the crater. Unit C, with two sets of clinoforms, records a major progradational event in the eastern portion of the basin that may to be related to turbidite deposition in sequence 3 in Yax-1 (Fig. 1). The timing of significant platform progradation into the basin near Yax-1; however, appears to be during sequence 4, i.e. later than in the eastern part of the basin. Seismic units D and E display parallel reflectors indicating relatively level bottom conditions similar to the depositional environments indicated by lithofacies in upper sequence 4 and sequence 5. By the time of deposition of unit E, the western and central parts of the basin were mostly infilled. The top of units E and D, at the edges of the inner crater, is an erosional truncation surface that marks the base of unit F. Unit F, overlies an erosional truncation that cuts into units D and E, and is characterized by discontinuous reflectors that are restricted to the northeastern portion of the basin, the last part of the basin to be infilled during the Tertiary (Pearson et al., 2006; Whalen et al., 2007; Gulick et al., 2008).

Chicxulub Impact Basin1

Figure 2. DOSECC’s Hybrid Coring System installed on a rotary rig, drilling the Yax-1 core.

 

Chicxulub is the largest well-preserved impact structure on Earth. Analysis of the Yax-1 core and comparison with patterns of deposition revealed with 2D seismic data provide us with information about the post-impact history of Chicxulub and the history of infilling the impact basin. If Chicxulub is representative, large marine impacts in tectonically quiescent regions may dominate local depositional environments for millions to tens of millions of years post-impact before returning control to eustasy. Successions within impact basins will likely record shoaling and slope readjustment as the instantaneously created basin is filled on geologic timescales. Our understanding of the processes and consequences of large-scale impacts have been enhanced through study of the Chicxulub impact structure and sediment infill. The relatively rapid, post-impact recovery of the Yucatàn carbonate platform demonstrates the resiliency of the carbonate-producing systems to even the most catastrophic, mass-extinction inducing events.

 

 

 

 

Read more on this scientific core drilling services project at ICDP.

References

Dressler, B.O., Sharpton, V.L. Morgan, J.V., Buffler, R., Moran, D., Smit, J., Stöffler, D., and Urrutia, J., 2003, Investigating a 65-Ma-Old Smoking Gun: Deep Drilling of the Chicxulub Impact Structure. EOS, Transactions, American Geophysical Union v. 84, no. 14, p. 125-130.

Gulick, S. P. S., P. J. Barton, G. L. Christeson, J. V. Morgan, M. McDonald, K. Mendoza-Cervantes, Z. F. Pearson, A. Surendra, J. Urrutia-Fucugauchi, P. M. Vermeesch, and M. R. Warner (2008), Importance of pre-impact crustal structure for the asymmetry of the Chicxulub impact crater, Nature Geoscience, v. 1, p. 131-135.

Pearson, Z.F., Whalen, M.T., Gulick, S.P., and Norris, R., 2006, Annealing The Chicxulub Impact: Tertiary Yucatan Carbonate Platform Development and Basin Infilling, Geological Society of America Abstracts with Programs, v. 38, p. 297.

Whalen, M.T., Pearson, Z.F., and Gulick, S.S.P., 2007, Toward a Sequence Stratigraphy of the Chicxulub Impact Basin Infill: Integration of Lithostratigraphy, Biostratigraphy, and Seismic Stratigraphy: Final Report of Pre-drilling Activity Proposal to the Joint Oceanographic Institutions, 27 p.

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Koolau

Koolau Volcano Drilling scientific core drilling company

Rock Coring Koolau Volcano, Hawai’i: Implications for Deep Mantle Recycling of the Crust

Michael O. Garcia University of Hawai’i

 

Mantle plumes produce basalts which provide fundamental information on the composition and history of the mantle.Ê The Hawaiian plume is the classic example of a mantle plume and its basalts are unquestionably the best studied suite from any plume. The subaerially exposed lavas of Koolau Volcano belong to the Enriched Mantle1 endmember of ocean island basalts and they define a geochemical endmember among Hawaiian shield lavas in major and trace elements and in isotopes. Koolau lavas are important to an understanding of the origin and evolution of the Hawaiian plume and the mantle. In particular, Koolau lavas appear to provide the strongest evidence for deep mantle recycling of crust (sediments and basalt), although this interpretation remain controversial and is based on sampling only the uppermost veneer of the volcano. It is important to establish the longevity of the distinctive Koolau geochemical signature by sampling deeper and older lavas from the volcano. If there were basaltic and sedimentary components in the Hawaiian plume, were they restricted to the final stages of Koolau volcano’s growth? Scientific drilling will allow us to answer this question by obtaining lavas from subsurface of this enigmatic volcano.

Koolau Volcano Drilling

Figure 1 – Schematic drawing and photos of Kalihi Shaft Well drilling.

Funding in support of this project has been obtained from the U.S. National Science Foundation and from several U.S., German and Japanese research groups that will support collecting about 300 m of rock cores from the base of the Kalihi, a 345 m deep, water observation hole, which has just been drilled by the City of Honolulu. This coring will extend below any surface exposures of the volcano’s lavas and it is expected that the rocks obtained will have experienced less topical weathering than surface rocks. As part of this project, we will systematically log the chips obtained from the upper part of the well. The cores from the lower 300 m of the well will be logged following procedures we have developed for the Hawaii Scientific Drilling Program. We have assembled an international team of experts to make a thorough petrographic and geochemical characterization of the core and chips from the Kalihi hole as part of this one year project. This will include petrography, mineral and glass chemistry by microprobe, and whole-rock major and trace element (Rb, Sr, Y, Zr, Nb, V, Ni, Cr, Zn, by XRF , and all REE, Ta, Ba, Nb, Th, Hf, U, Pb, Rb, Cs by ICP-MS) compositions for approximately 50 lavas flows and O, Pb, Sr, Nd and Hf isotope ratios for select samples. Several of the flows will also be dated by Ar-Ar.

 

DOSECC has provided core drilling services for the Koolau Drillling Project that is under the direction of Dr. Michael Garcia of the University of Hawaii. Their CS1500 rig was used for deepen an existing well on the Kalihi Board of Water Supply Site (Figure 3.) The drilling project began on April 14 and drilling ended on May 24, 2000.

The Kalihi Shaft Well had previously been drilled to a depth of 1150 feet. 8-5/8″ casing extends from the surface to a depth to 150 feet; beneath that, the well has no casing. In order to core the bottom part of the well, a temporary liner is installed from the surface to 1150 feet. The core drilling is being done through this temporary liner.

The coring uses rod with an outer diameter of 3.65 inches and collects core of 2.4 inches. The coring assemblies are shown on the right. The rock is cut using a diamond core bit, and the core sample is fed into a 10 foot core barrel. When this barrel is full, it is retrieved to the surface using a wireline while the core bit and rods remain in the hole.

The major funding for the drilling project is from the University of Hawaii, NSF and ICDP, with additional funding from the following institutions: California Institute of Technology, Massachusetts Institute of Technology, University of California at Berkeley. Woods Hole Oceanographic Institute, Tokyo Institute of Technology, Carnegie Institute of Washington, Max-Plank-Institute fur Chemie.

Koolau Volcano Drilling1

Figure 2 – University of Hawaii geology and geophysics professor Mike Garcia, examines a core sample taken from the Koolau mountains. Graduate research assistant Eric Haskins works in the background. (George F. Lee, Star-Bulletin)

 

 

 

 

 

 

 

 

 

 

 

 

Related Publications:

Chen, C.-Y., et al., The tholeiite to alkalic basalt transition at Haleakala Volcano, Maui, Hawaii, Contrib. Mineral. Petrol. 106, 183-200, 1991.

Clague, D. A., Dalrymple, G. B., The Hawaiian Emperor Volcanic Chain, USGS Prof. Paper 1350, 5-54, 1987.

Eiler, J.M., Farley, K.A., Valley, J.W., Hofmann, A.W. and Stolper, E.M., Oxygen isotope constraints on the sources of Hawaiian volcanism, Earth Planet. Sci. Lett., 144, 453-468, 1996a.

Eiler, J. M., Valley, J. W. and Stolper, E. M., Oxygen isotope ratios in olivine from the Hawaii Scientific Drilling Project, J. Geophys. Res., 101, 11,807-11,814, 1996b.

Frey, F. A., Garcia, M. O. and Roden, M. F., Geochemical characteristics of Koolau Volcano: Implications of intershield geochemical differences among Hawaiian volcanoes, Geochim. Cosmochim. Acta, 58, 1441-1462, 1994.

Frey, F. A. and Rhodes, J. M., Intershield geochemical differences among Hawaiian volcanoes: implications for source compositions, melting process and magma ascent paths, Phil. Trans. R. Soc. Lond. A, 342, 121-136, 1993.

Garcia, M. O., Foss, D.J.P., West, H.B. and Mahoney, J.J., Geochemical and isotopic evolution of Loihi Volcano, Hawaii, Jour. Petrol., 36, 1647-1674, 1995.

Garcia, M., Muenow, D., Aggrey, K. and O’Neil, J., Major element, volatile and stable isotope geochemistry of Hawaiian submarine tholeiitic glasses. J. Geophys. Res., 94, 10,525-10,538, 1989

Garcia, M., Rubin, K.H., Norman, M.D., Rhodes, J.M., Graham, D.W., Muenow, D.,

Spencer, K., Petrology and geochronology of basalt breccia from the 1996 earthquake swarm of Loihi Seamount, Hawaii: Magmatic history of its 1996 eruption. Bull. Volcanol. 59, 577-592, 1998

Hauri, E. H., Major-element variablity in the Hawaiian mantle plume. Nature 382, 415-419, 1996.

Hauri, E. H., Lassiter, J. C. and DePaolo, D. J., Osmium isotope systematics of drilled lavas from Mauna Loa, Hawaii, J. Geophys. Res., 101, 11,793-11,806, 1996.

Jackson, M. C., Frey, F.A., Garcia, M.O. and Wilmoth, R.A., Geology and petrology of basaltic lavas and dikes of the Koolau Volcano in the Trans-Koolau exploratory tunnels, Bull. Volcan., 60, 381-401, 1999.

Kyser, T. K. O=Neil, J.R., and Carmichael I. S. E., Genetic relations among basic lavas and ultramafic nodules: Evidence from oxygen isotope compositions: Contrib. Mineral. Petrol., v. 81, p. 88-102, 1982.

Lassiter, J. C., DePaolo, D. J. and Tatsumoto, M., Isotopic evolution of Mauna Kea volcano: Results from the initial phase of the Hawaiian Scientific Drilling Project, J. Geophys. Res., 101, 11,769-11,780, 1996.

Koolau Volcano Drilling2

Figure 3 – DOSECC’s CS1500 drilling rig at the Koolau drillsite.

 

 

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Hawaii Volcano Observatory

Hawaii Volcano1 scientific drilling core drilling services core drilling companies

A Geochemical Investigation of the Role of Recycled Oceanic Crust in Hawaiian Magmatism

Amy M. Gaffney Lawrence Livermore National Laboratory

Investigations of the role of oceanic lithosphere in the geochemistry of Hawaiian magmas have generated two main families of hypotheses. One invokes ancient oceanic lithosphere that has been subducted, stored in the mantle for some length of time and recycled into the plume source where it contributes to compositional variation in the plume-generated lavas (e.g., White & Hofmann, 1982; Lassiter & Hauri, 1998; Blichert-Toft et al., 1999). Alternatively, plume-generated magmas may acquire geochemical characteristics of oceanic lithosphere by interacting with or assimilating it as they rise to the surface (e.g., Chen & Frey, 1985; Eiler et al., 1996). Singly or together, these processes may contribute to the range of compositional variability expressed through the two primary compositional endmembers of Hawaiian shield-stage magmatism: the relatively enriched Ko’olau component and the relatively depleted Kea component.

Hawaii Volcano1

Kea-type lavas have the most depleted Sr and Nd isotopic compositions of all Hawaiian shield-stage lavas, and thus the Kea source material has been interpreted as having an association with or derivation from ambient depleted mantle or oceanic lithosphere. Identification and characterization of oceanic lithosphere associations and the resulting compositional variations within Kea-type lavas require high-density sampling as well as stratigraphic (i.e., time) control. This approach was successfully implemented for the young Kea-type Mauna Kea volcano with the multi-disciplinary work on the Hawaii Scientific Drilling Project (HSDP) cores (e.g., Stolper et al., 1996, and included papers; Blichert-Toft & Albarede, 1999; Abouchami et al., 2000; DePaolo et al., 2001; Blichert-Toft et al., 2003; Eisele et al, 2003; Huang & Frey, 2003).

From this project, broad conclusions were drawn about the compositional structure of the Hawaiian plume and the origin of the compositional variations within Mauna Kea lavas. However, in order to evaluate the role of oceanic lithosphere in the origin of geochemical heterogeneity in Kea-type volcanoes on an inter- and intra-volcano scale, analogous studies on older volcanoes are important. Thus, a study was undertaken to geochemically characterize stratigraphically-controlled sequences of shield-stage lavas from West Maui volcano, an older (~1.8 Ma) Kea-type volcano.

Questions Addressed With this Research

  • What is the range of chemical variability that characterizes the Kea component?
  • What is the role of oceanic lithosphere in generating the chemical variability among Kea-type lavas?
  • How, if at all, does the contribution of oceanic lithosphere to geochemical heterogeneity in Kea-type lavas vary on an intra- and inter-volcano scale?

The samples used for this study were collected from a monitoring well at the Mahinahina Water Treatment Facility near Honokawai, Maui. This study site was an exceptional location for this investigation, as the samples collected provided a stratigraphic sequence representing the late shield-stage of magmatism at West Maui volcano. This sequence of lavas is comparable to those obtained in the early stages of drilling on the HSDP core on Mauna Kea, thus enabling comparison between the two sets of data and testing of the broad applicability of models of magmatism derived from individual volcanoes. Comprehensive geochemical data set was obtained for these samples, including major and trace element and Sr-Nd-Hf-Pb-O-Os isotopic data.  A variety of geochemical modeling techniques were used to assess contributions of oceanic lithosphere to these magmas, and evaluate the origin of the Kea component. This work led to several conference presentations as well as three publications (Gaffney et al., 2004; Gaffney et al., 2005a; Gaffney et al., 2005b).

This study resulted in several important conclusions that have contributed to current understanding of the origin of geochemical heterogeneity in Hawaiian magmatism. First, it was showed that although Kea-type magmatism at West Maui and other Kea-type volcanoes derives its primary geochemical characteristics from ancient recycled oceanic crust in the plume source, some lavas from these volcanoes also carry geochemical fingerprints of Pacific oceanic crust that was assimilated by the plume-derived magmas. This shallow source is identifiable only within relatively short stratigraphic sequences of lavas, indicating that oceanic crust contamination is an episodic, rather than continuous, process.

Second, it was showed that recycled oceanic crust in the Hawaiian plume controls geochemical variability in erupted magmas on an inter- and intra-volcano scale. Whereas the different parts of recycled oceanic crust (upper vs. lower crust) control the large compositional differences observed between Kea-type and Ko’olau-type Hawaiian volcanoes, the physical mechanisms of melting recycled oceanic crust in the plume control the chemical variability observed within any individual volcano. Thus, the relatively narrow range of chemical variability that characterizes the Kea component reflects the processes involved with melting of recycled lower oceanic crust (peridotite and eclogite), whereas the relatively large range of chemical variability that characterizes Ko’olau-type Hawaiian volcanoes reflects the processes involved in melting the lithologically distinct recycled upper oceanic crust (eclogite and metamorphosed sediment).

Lastly, through comparing the time-compositional relationships on an intra- and inter-volcano scale for Hawaiian magmatism over the last ~3 million years, it was concluded that the scale of oceanic crust heterogeneities in the Hawaiian plume is large enough that they are sampled over the lifespans of several volcanoes. In contrast, the chemical variability introduced by assimilation of Pacific oceanic crust reflects a process that only operates in the latest stages of the volcano’s life, once magma flux from the plume has decreased considerably from its peak flux during the main stages of volcanic shield-building.

References:

Abouchami, W., Galer, S. J. G. & Hofmann, A. W. (2000). High precision lead isotope systematics of lavas from the Hawaiian Scientific Drilling Project. Chemical Geology 169, 187-209.

Blichert-Toft, J. & Albarède, F. (1999). Hf isotopic compositions of the Hawaii Scientific Drilling Project core and the source mineralogy of Hawaiian basalts. Geophysical Research Letters 27(7), 935-938.

Blichert-Toft, J., Weis, D., Maerschalk, C., Agranier, A. & Albarède, F. (2003). Hawaiian hot spot dynamics as inferred from the Hf and Pb isotope evolution of Mauna Kea volcano. Geochemistry Geophysics Geosystems 4, 2002GC000340.

Chen, C.-Y. & Frey, F. A. (1985). Trace element and isotopic geochemistry of lavas from Haleakala Volcano, East Maui, Hawaii: implications for the origin of Hawaiian basalts. Journal of Geophysical Research 90, 8743-8768.

DePaolo, D. J., Bryce, J. G., Dodson, A., Schuster, D. L. & Kennedy, B. M. (2001). Isotopic evolution of Mauna Loa and the chemical structure of the Hawaiian plume. Geochemistry, Geophysics, Geosystems 2, 2000GC000139.

Eiler, J. M., Farley, K. A., Valley, J. W., Hofmann, A. W. & Stolper, E. M. (1996). Oxygen isotope constraints in the sources of Hawaiian volcanism. Earth and Planetary Science Letters 144, 453-468.

Eisele, J., Abouchami, W., Galer, S. J. G. & Hofmann, A. W. (2003). The 320 kyr Pb isotope record of Mauna Kea lavas recorded in the HSDP-2 drill core. Geochemistry, Geophysics, Geosystems 4, 2002GC000339.

Gaffney, A.M., Nelson, B.K., and Blichert-Toft, J., 2005 Melting in the Hawaiian plume at 1-2 Ma as recorded at Maui Nui: the role of eclogite, peridotite and source melting. Geochemistry, ‘Geophysics, Geosystems 6, 10.1029/2005GC000927.

Gaffney, A.M, Nelson, B.K., Reisberg, L. and Eiler, J., 2005, Oxygen-osmium isotopic compositions of West Maui lavas: a record of shallow-level magmatic processes. Earth and Planetary Science Letters 239, 122-139.

Gaffney, A.M., Nelson, B.K., and Blichert-Toft, J, 2004, Geochemical constraints on the role of oceanic lithosphere in intra-volcano heterogeneity at West Maui, Hawaii, Journal of Petrology 45, 1663-1687.

Hauri, E. H. (1996). Major-element variability in the Hawaiian mantle plume. Nature 382, 415-419.

Huang, S. & Frey, F. A. (2003). Trace element abundances of Mauna Kea basalt from phase 2 of the Hawaii Scientific Drilling Project: petrogenetic implications of correlations with major element content and isotopic ratios. Geochemistry Geophysics Geosystems 4, 2002GC000322.

Lassiter, J. C. & Hauri, E. H. (1998). Osmium-isotope variations in Hawaiian lavas: evidence for recycled oceanic lithosphere in the Hawaiian plume. Earth and Planetary Science Letters 164, 483-496.

Stolper, E. M., DePaolo, D. J. & Thomas, D. M. (1996). Introduction to special section; Hawaii Scientific Drilling Project. Journal of Geophysical Research 101, 11,593-11,598.

White, W. M. & Hofmann A. W. (1982) Sr and Nd isotope geochemistry of oceanic basalts and mantle evolution. Nature 296, 821-825.

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Great Salt Lake Scientific Drilling

Bonneville Basin scientific drilling

Ecosystem and Paleohydrological Response to Quaternary Climate Change in the Bonneville Basin, Utah

Scientific Drilling Project by DOSECC Core Drilling Services

Deborah P. Balch, Andrew S. Cohen and J. Warren Beck University of Arizona

Douglas W. Schnurrenberger University of Minnesota (currently at DOSECC)

Brian J. Haskell, Hai Cheng and R. Lawrence Edwards University of Minnesota

Blas L. Valero Garces Pyrenean Institute of Ecology

We report the results of a detailed paleoecological study of the Bonneville basin covering the last ~280,000 yr. Our study used fossil ostracodes and a sedimentological record obtained from the August 2000 GLAD800 drilling operation at Great Salt Lake. We analyzed 125 samples, taken at ~1 m intervals from Site 4 (GSL00-4), for ostracodes and other paleoecologic and sedimentologic indicators of environmental change. Multivariate analyses applied to the ostracode data and qualitative analyses of fossil and sedimentological data indicate an alternation between three major environments at the core site over the cored interval: (1) shallow saline or hypersaline lakes; (2) salt or freshwater marshes; and (3) occasional deep freshwater lakes. These environmental changes are consistent with shoreline studies of regional lake level fluctuations, but provide considerable new detail on both the timing and environmental conditions associated with the various lake phases. Our age model (using 14C, U-Series, tephra and biostratigraphic chronologies) allowed us to associate the core’s record of regional paleohydrology with the marine oxygen isotope stages of global climate change. The core contains continuous records for the last four glacial/interglacial sequences. Salt/freshwater marshes were common during the interglacials and deep freshwater conditions correspond with maximum global ice volume in OIS 2, and before a maximum in global ice during OIS 6. Immediately following deep lake phases, crashes in lake level from rapid desiccation resulted in the deposition of thick evaporite units. Our study suggests that the climate of the Great Salt Lake catchment appears to have been drier during OIS 6 than during OIS 2.We compare our record of environmental change during OIS 6 glaciation with other records from western United States and find that the overall pattern of climate was similar throughout the West, but differences in the timing of climate change (i.e. when a region became drier or moister) are common.

Bonneville Basin Drilling

Figure 1 – GLAD800 drilling barge on the Great Salt Lake

In the late 1990s, the International Continental Drilling Program (ICDP) provided funds for DOSECC (the US nonprofit research consortium for continental scientific drilling) to develop a dedicated lake drilling system, designated the GLAD800 system. The intent of this grant was to jump start scientific drilling in lakes around the world with an inexpensive and modular system that would be easily transported between sites, and would be broadly accessible to the scientific community. This system, including a barge platform, drill rig and coring tool kit, was first tested with NSF support at the Great Salt Lake and Bear Lake in August 2000. The mandate from NSF was that all engineering tests of the GLAD-800 system be coupled to significant scientific questions, so that the testing would also yield scientific benefits. The long history of scientific (and specifically paleoclimate) research on the Great Salt Lake, coupled with DOSECC’s location in Salt Lake City, made the Great Salt Lake and Bear Lake natural targets for this testing.

Bonneville Basin Drilling1

Figure 2 – Drilling locations

The drilling campaign collected four long cores from the Great Salt Lake and obtained a total of 371 m of sediment with 96% recovery. One site in particular, GSL00-4 (also known as Site 4), reached 121 m below lake floor (mblf) and provides the longest continuous record of the lake’s history ever collected from a drilling operation. Drilling took place in the hanging wall of the Carrington Fault, which is located along the southeast margin of the lake’s northern basin (Fig. 1). The primary objective for drilling at this site was to obtain a detailed basinal history extending back to Oxygen Isotope Stage (OIS) 6 and to use its paleontological and sedimentological contents to address questions related to paleoclimate. A preliminary study of the core, based on core catcher samples taken every 3 m (ca. 6000 yr resolution), suggested that Site 4 contains a high- resolution paleoecological record extending back ~250,000 yr BP based on tephra correlation and preliminary U-series dating (Dean et al., 2002). Paleoecological analyses of its ostracode assemblages, in particular, have shown that the lake levels have fluctuated over time giving rise to both marsh conditions and saline, open water conditions at the core site (Kowalewska and Cohen, 1998; Dean et al., 2002). Up to this point, we did not have detailed knowledge about these environmental fluctuations because the previous studies were at too low of a resolution. The goal of this current study was to explain these patterns in greater detail by accomplishing the following: (i) increase sampling frequency to improve resolution; (ii) resolve the chronological sequence of paleoecological and paleolimnological change through the acquisition of a reliable age model; and (iii) determine if these changes are correlated with changes in regional or global climate change, particularly at the glacial/interglacial time scale.

Bonneville Basin Drilling2

Figure 1 – Site 4 composite density and susceptibility graph

 

Site 4 contains a highly continuous paleoecological archive of Quaternary environmental and climate change. Our intermediate resolution sampling (~2,000 yr) is too coarse to capture the finer environmental fluctuations preserved in the core, however this study is a first step in unlocking the rich paleoenvironmental story of the Bonneville basin preserved at Site 4. Its paleoecological and sedimentological indicators show that the core site has fluctuated over time mostly between marsh and saline to hypersaline open-water conditions, but has, on occasion, been submerged in deep, freshwater. These local environmental changes can be understood in terms of oscillating lake levels. Our study confirms that climate forcing has played a major role in these lake level fluctuations and some, though not all, of the climatic fluctuations can be associated with changes in global ice volume. Overall, we see low to very low lake levels during the interglacial cycles (OIS 7, 5, 3 and 1). The lowest lake levels coincide with the presence of marsh indicators in the core’s sedimentary and paleoecological record. Saline/hypersaline conditions at the core site indicate regional lake levels higher than during marsh phases, but significantly lower than open freshwater conditions, such as the Little Valley cycle (mid OIS 6) and the Lake Bonneville cycle (late OIS 2). However, the climate of the Great Salt Lake catchment appears to have been drier during OIS 6 than during OIS 2. Thus, the high-resolution records and climate models from the last glacial advance may not serve as a good analog for the older glacial cycles. Many smaller lake level oscillations are recorded in Site 4, and with higher resolution sampling and a more robust age model, we may find that these smaller oscillations are sensitive to climate changes on millennial or shorter time scales. Oviatt (1997) found that some of the lake fluctuations associated with Lake Bonneville coincided with millennial scale Heinrich events. The sediments contained in Site 4 provide a detailed natural archive of (1) local environmental and ecological change at the core site (2) fluctuations in regional paleohydrology and (3) climate change over the last four glacial/interglacial sequences. This long, continuous record provides important insights into the paleoecology, paleohydrology and paleoclimate of the northeastern Great Basin, and will allow us the unique opportunity to link these insights into an interdisciplinary framework of past global change.

View the proposal for this scientific drilling project at ICDP.

Representative References:

Antevs, E., 1948. Climatic changes and pre-white man. The Great Basin, with Emphasis on Glacial and Postglacial Times, Bulletin of the University of Utah, vol. 38, pp. 167– 191.

Beck, W.J., Richards, D.A., Edwards, R.J., Silverman, B.W., Smart, P.L., Donahue, D.J., Hererra-Osterheld, S.H., Burr, G.S., Calsoyas, L., Jull, A.J.T., Biddulph, D., 2001. Extremely large variations of atmospheric 14C concentration during the last glacial period. Science, 292, 2453– 2458.

Cheng, Hai, Edwards, R. Lawrence, And Dettman, David L., 2005. A ~280ka Paleoecologic and Paleoclimatic Record for the Bonneville Basin derived from the GLAD800 Drilling Campaign at Great Salt Lake, Utah: oral presentation given at GSA Annual Meeting, Salt Lake City, UT

Cohen, A.S., Palacios_Fest, M.R., Negrini, R.M., Wigand, P.E., Erbes, D.B., 2000. A paleoclimate record for the past 250,000 years from Summer Lake, Orgeon, USA: II. Sedimentology, paleontology and geochemistry. J. Paleolimnol., 24, 151– 182.

Cohen, Andrew S., Balch, Deborah P., Helfrich, L. Cody Schnurrenberger, Douglas W., Haskell, Brian J., Valero-Garcés, Blas L., Beck, J. Warren, COHMAP, 1988. Climate changes in the last 18,000 years: observations and simulations. Science, 241, 1043– 1052.

Currey, D.R., 1990. Quaternary palaeolakes in the evolution of semidesert basins, with Special emphasis on Lake Bonneville and the Great Basin, USA. Palaeogeogr. Palaeoclimatol. Palaeoecol.,76, 189–214.

Currey, D.R., Oviatt, C.G., 1985. Durations, average rates, and probable causes of Lake Bonneville expansions, still-stands, and contractions during the last deep-lake cycle, 32,000 to 10,000 years ago. In: Kay, P.A., Diaz, H.F. (Eds.), Problems of and Prospects for Predicting Great Salt Lake Level. Cent. Publ. Affairs Admin. Univ. Utah, pp. 9 –24.

Davis, O.K., 1998. Palynological evidence for vegetation cycles in a 1.5 million year pollen record from the Great Salt Lake, Utah, USA. Palaeogeogr. Palaeoclimatol. Palaeoecol., 138, 175–185.

Davis, O.K., Moutoux, T.E., 1998. Tertiary and Quaternary vegetation history of the Great Salt Lake. J. Paleolimnol., 19, 417–427.

Dean, W., Rosenbaum, J., Haskell, B., Kelts, K., Schnurrenberger, D., Valero-Garces, Blas, Cohen, A., Davis, O., Dinter, D., Nielson, D., 2002. Progress in global lake drilling holds potential for global change research. Trans.-Am. Geophys. Union, 83 (85), 90– 91.

Hostetler, S.W., Giorgi, F., Bates, G.T., Bartlein, P.J., 1994. Lake–atmosphere feedbacks associated with paleolakes Bonneville and Lahontan. Science, 263, 665– 668.

Kaufman, D.S., Forman, S.L., Bright, J., 2001. Age of the Cutler Dam Alloformation (late Pleistocene), Bonneville basin, Utah. Quat. Res., 56, 322– 334.

Kowalewska, A., Cohen, A.S., 1998. Reconstruction of paleoenvironments of the Great Salt Lake Basin during the late Cenozoic. J. Paleolimnol., 20, 381– 407.

Kutzbach, J.E., Guetter, P.J., Behling, P.J., Selin, R., 1994. Simulated climatic changes: results of the COHMAP climate model experiments. In: Wright Jr., H.E., Kutzbach, J.E., Webb, T.I., Ruddiman, W.T., Street-Perrott, F.A., Bartlein, P.J. (Eds.), Global Climates Since the Last Glacial Maximum. University of Minnesota, Minneapolis, pp. 24– 93.

Oviatt, Charles G., And Thompson, Robert S., 2005. Late Quaternary History of Great Salt Lake and Lake Bonneville from Sediment Cores: oral presentation given at GSA Annual Meeting, Salt Lake City, UT

Oviatt, C.G., 1997. Lake Bonneville fluctuations and global climate change. Geology, 25, 155– 158.

Oviatt, C.G., 2002. Bonneville basin lacustrine history: thecontributions of G.K. Gilbert and Ernst Antevs. In: Hershler, R., Madsen, D.B., Currey, D.R. (Eds.), Great Basin Aquatic Systems History. Smithsonian Contributions to the Earth Sciences, vol. 33. Smithsonian Institution Press, Washington, DC, pp. 121–129.

Oviatt, C.G., McCoy, W.D., Reider, R.G., 1987. Evidence for a shallow Early or Middle Wisconsin-age lake in the Bonneville basin, Utah. Quat. Res., 2, 248–262.

Oviatt, C.G., Currey, D.R., Miller, D.M., 1990. Age and paleoclimatic significance of the Stansbury shoreline of Lake Bonneville, northeastern Great Basin. Quat. Res., 33, 291–305.

Oviatt, C.G., Currey, D.R., Sack, D., 1992. Radiocarbon chronology of Lake Bonneville, Eastern Great Basin, USA. Palaeogeogr. Palaeoclimatol. Palaeoecol., 99, 225–241.

Oviatt, C.G., Thompson, R.S., Kaufman, D.S., Bright, J., Forester, R.M., 1999. Reinterpretation of the Burmester Core, Bonneville Basin, Utah. Quat. Res., 52, 180– 184.

Palacios, M., Cohen, A., Haskell, B., Valero-Garces, B., Schnurrenberger, D., Heil, C., Dean, W., Davis, O., Kruger, N., Dinter, D., 2001. GLAD 1, GSL Site 4. In: Schnurrenberger, D., Haskell, B. (Eds), Initial Reports of Global Lakes Drilling Program Volume 1. Glad 1: Great Salt Lake, Utah and Bear

Lake, Utah, Idaho. Limnological Research Center CDROM, University of Minnesota, Minneapolis, Minnesota, pp. 37–46; 271–315.

Schnurrenberger, D., Russell, J., Kelts, K., 2003. Classification of lacustrine sediments based on sedimentary components. J. Paleolimnol., 29, 141–154.

Scott, W.E., McCoy, W.D., Shroba, R.R., Rubin, M., 1983. Reinterpretation of the exposed record of the last two cycles of Lake Bonneville, western United States. Quat. Res., 20, 261– 285.

Spencer, R.J., Baedecker, M.J., Eugster, H.P., Forester, R.M., Goldhaber, M.B., Jones, B.F., Kelts, K., Mckenzie, J., Madsen, D.B., Rettig, S.L., Rubin, M., Bowser, C.J., 1984. Great Salt Lake, and precursors, Utah: the last 30,000 years. Contrib. Mineral. Petrol., 86, 321– 334.

Thompson, R.S., Toolin, L.J., Forester, R.M., Spencer, R.J., 1990. Accelerator-mass spectrometer (AMS) radiocarbon dating of Pleistocene lake sediments in the Great Basin. Palaeogeogr. Palaeoclimatol. Palaeoecol., 78, 301– 313.

Thompson, R.S., Whitlock, C., Bartlein, P.J., Harrison, S.P., Spaulding, W.G., 1993. Climatic changes in the western United States since 18,000 yr B.P. In: Wright Jr., H.E., Kutzbach, J.E., Webb, T.I., Ruddiman, W.T., Street-Perrott, F.A., Bartlein, P.J. (Eds.), Global Climates Since the Last Glacial Maximum. University of Minnesota, Minneapolis, pp. 468–513.

Whitlock, C., Sarna-Wojcicki, A.M., Bartlein, P.J., Nickmann, R.J., 2000. Environmental history and tephrostratigraphy at Carp Lake, southwestern Columbia basin, Washington, USA. Palaeogeogr. Palaeoclimatol. Palaeoecol., 155, 7 –29.

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Bear Lake Scientific Drilling Project

Bear Lake Drilling scientific drilling

Paleoenvironments of Bear Lake, Utah and Idaho

Scientific Drilling Project by DOSECC Core Drilling Services

Joseph G. Rosenbaum, Walter E. Dean, and Marith C. Reheis USGS, Denver, CO

Jordon Bright, Darrell S. Kaufman, R. Scott Anderson, and Gonzalo Jiménez-Moreno Northern Arizona University

Steven M. Colman Large Lakes Observatory, University of Minnesota, Duluth

Clifford W. Heil, Jr. University of Rhode Island

Joseph P. Smoot USGS, Reston, VA

Lisa A. Doner Plymouth State University

Katrina Moser University of Western Ontario 

Bear Lake is located 100 km northeast of Salt Lake City and lies along the course of the Bear River, the largest river in the Great Basin. The lake, which is one of the oldest extant lakes in North America, occupies a tectonically active half-graben and contains hundreds of meters of Quaternary sediment. In 1996 a group led by the late Kerry Kelts (University of Minnesota) and Robert Thompson (U.S. Geological Survey) acquired three Kullenburg piston cores (4 to 5 m long) from Bear Lake. The coring arose from their recognition of Bear Lake as a potential repository of long records of paleoenvironmental change. They recognized that the lake is located in an area that is sensitive to changes in regional climate patterns, that the lake basin is long lived, and that, unlike many lakes in the Great Basin, Bear Lake was never dry during warm dry periods.

Bear Lake Drilling

Figure 1 – Comparison of carbonate-mineral content in the 120-m section of Bear Lake sediments penetrated by GLAD800 coring and oxygen isotope values (δ18O) based on SPECMAP. Weight % CaCO3 is based on total inorganic carbon and the proportion of calcite and aragonite is based on X-ray diffraction peak heights. δ18O values are in standard deviation units.

Paleoenvironmental studies of the Bear Lake sediment were conducted under the Western Lake/Catchment Systems Project of the USGS (funded by the USGS Earth Surface Dynamics Program). Initially, paleoenvironmental studies of Bear Lake focused on the three Kullenburg cores, which spanned the last ~30,000 years. Additional coring was conducted to elucidate the spatial distribution of sedimentary units. The study was also expanded to include extensive study of the catchment, including the properties of catchment materials and the processes that could potentially affect the delivery of catchment materials to the lake.

During 2000, DOSECC needed to test the newly developed GLAD800 drilling platform on suitable sites in the vicinity of Salt Lake City prior to shipping the platform to remote locations. Following initial testing in the shallow waters of Great Salt Lake, the GLAD800 platform was transported to Bear Lake where it was tested in deeper water (>50 m). The cost of drilling on Bear Lake was split equally between the USGS and NSF. Coring was extremely successful with nearly 100% recovery. Two cores, acquired near the lake’s depocenter (100 m and 120 m in length), extend the Bear Lake record over three glacial/interglacial cycles (about a quarter-million years).

Responses of the lake and catchment to climate change include intermittent disconnection from the Bear River, alternation between siliciclastic sedimentation (including glacial flour) and endogenic carbonate sedimentation (with aragonite forming during the driest intervals), and changes in stable isotopes, diatoms, and pollen. Although the lake underwent major changes in lake level, it did not dry out or become highly saline over the last several hundred thousand years. As a consequence of its relatively stable hydrology, the lake developed endemic populations of fish and ostracodes. Many of the results of this study are presented in Geological Society of America Special Paper 450, “Paleoenvironments of Bear Lake, Utah and Idaho, and its catchment”.

Bear Lake Drilling1

Figure 2 – Bear Lake, Utah

References (*indicates that report contains information from GLAD800 core)

*Initial Reports of the Global Lake Drilling Program, Volume 1: GLAD1: Great Salt Lake, Utah, and Bear Lake, Utah/Idaho – Edited by D. Schnurrenberger and B. Haskell. (NOTE: This is a CD put out by the Limnological Research Center, University of Minnesota.)

*Dean, W.E, Rosenbaum, J.G, Haskell, B., Kelts, K., Schnurrenberger, D.,Valero-Garcés, B., Cohen, A., Davis, O., Dinter, D., and Nielson, D., 2002, Progress in Global Lake Drilling holds potential for Global Change research, EOS (Trans. American Geophysical Union), v. 83, p. 85, 90, 91.

*Colman, S.M., 2006, Acoustic stratigraphy of Bear Lake, Utah-Idaho—Late Quaternary sedimentation in a simple half-graben: Sedimentary Geology, v. 185, p. 113–125.

*Bright, J., Kaufman, D.S., Forester, R.M., and Dean, W.E., 2006, A continuous 250,000 yr record of oxygen and carbon isotopes in ostracode and bulk-sediment carbonate from Bear Lake, Utah-Idaho: Quaternary Science Reviews, v. 25, no. 17-18, p. 2258–2270.

*Colman, S.M, Kaufman, D.S., Bright, J., Heil, C., King, J.W., Dean, W.E., Rosenbaum, J.G., R.M. Forester, R.M., Bischoff, J.L., Perkins, M., McGeehin, J.P., 2006, Age model for a continuous, ca 250-kyr Quaternary lacustrine record from Bear Lake, Utah-Idaho, USA: Quaternary Science Reviews.

*Jiménez-Moreno, G., Anderson, R.S., and Fawcett, P.J., 2007, Orbital- and millennial-scale vegetation and climate changes of the past 225 ka from Bear Lake, Utah-Idaho (USA): Quaternary Science Reviews, v. 26, p. 1713–1724.

*Rosenbaum, J.G. and Kaufman, D.S., 2009, Introduction to Paleoenvironments of Bear Lake, Utah and Idaho, and its catchment, in Rosenbaum, J.G., and Kaufman, D.S., eds., Paleoenvironments of Bear Lake, Utah and Idaho, and its catchment: Geological Society of America Special Paper 450, pp. v – xiii.

*Dean, W.E.,, 2009, Endogenic carbonate sedimentation in Bear Lake, Utah and Idaho, over the last two glacial-interglacial cycles, in Rosenbaum, J.G., and Kaufman, D.S., eds., Paleoenvironments of Bear Lake, Utah and Idaho, and its catchment: Geological Society of America Special Paper 450, pp. 169 – 196.

*Rosenbaum, J.G., and Heil Jr, C.W., 2009, The glacial/deglacial history of sedimentation in Bear Lake, Utah and Idaho, in Rosenbaum, J.G., and Kaufman, D.S., eds., Paleoenvironments of Bear Lake, Utah and Idaho, and its catchment: Geological Society of America Special Paper 450, pp. 247 – 262.

*Heil Jr., C.W., King, J.W., Rosenbaum, J.G., Reynolds, R.L., and Steven M. Colman, S.M., 2009, Paleomagnetism and environmental magnetism of GLAD800 sediment cores from Bear Lake, Utah and Idaho, in Rosenbaum, J.G., and Kaufman, D.S., eds., Paleoenvironments of Bear Lake, Utah and Idaho, and its catchment: Geological Society of America Special Paper 450, pp. 291 – 310.

*Kaufman, D.S., Bright, J., Dean, W.E., Rosenbaum, J.G., Moser, K., Anderson, R.S., Colman, S.M., Heil Jr., C.W., Gonzalo Jiménez-Moreno, G., Reheis, M.C., and Simmons, K.R., 2009, A quarter-million years of paleoenvironmental change at Bear Lake, Utah and Idaho, in Rosenbaum, J.G., and Kaufman, D.S., eds., Paleoenvironments of Bear Lake, Utah and Idaho, and its catchment: Geological Society of America Special Paper 450, pp. 311 – 351.

Abstracts:

*Rosenbaum, J., Dean, W., Honke, J., Skipp, G., Haskell, B., Schnurrenberger, D., Kelts, K., Palacios-Fest, M., Nielson, D., 2000, GLAD800 Drilling in Bear Lake, Utah/Idaho, Eos, v. 81, p. F709.

*Rosenbaum, J.G., Dean, W.E., Bright, J., Colman, S.M., Bischoff, J.L., Anderson, S.R., Forester, R.M., Kaufman, D.S., 2001, Climate record in a 240 kyr sediment core from Bear Lake, Utah/Idaho, Eos, v. 82, F756.

*Heil, C.W., King, J.W., Rosenbaum, J.G., 2001, Paleomagnetic chronology and mineral magnetic proxies of lake level for Bear Lake, Utah/Idaho, Eos, v. 82, F336-337.

*Dean, W.E., Bischoff, J.L., Forester, R.M., Rosenbaum, J.G., Simmons, K.R., and Skipp, G.L., Glacial-interglacial contrasts in carbonate sedimentation in Bear Lake Utah/Idaho – downstream recorder of Pacific climate, 2002, Geological Society of America Annual Meeting, Abstracts with Programs, p. 292.

*Dean, W.E., and Rosenbaum, J.G., 2003, GLAD800 coring on Bear Lake, Utah/Idaho, Third Annual Limnogeology Congress Abstract Volume, p. 71.

Rosenbaum, J.G., Dean, W.E., and S M Colman 2003, The glacial to Holocene transition in sediments from Bear Lake, Utah/Idaho, XVI INQUA Congress Programs with Abstracts, p. 163.

*Colman, S.M., Kaufman, D.S., Bright, J., Heil, C., King, J.W., Dean, W.E., Rosenbaum, J.G., Forester, R.M., Bischoff, J.L., Perkins, M., McGeehin, J.P., 2004, Age Model for a continuous 250-kyr Quaternary lacustrine record from Bear Lake, Utah-Idaho, Eos v. 85, abstract PP33B-0929.

*Kaufman, D.S., Anderson, R.S., Bright, J., Colman, S. M., Dean, W.E., Forester, R.M., Heil, C. W., Moser, K., Rosenbaum, J.G., and Simmons, K.R., 2005, Multi-proxy evidence for environmental change during the last two glacial-interglacial cycles from core BL00-1, Bear Lake, Utah-Idaho, Geological Society of America Abstracts with Programs, Vol. 37, No. 7, p. 336.

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Long Valley Exploratory Well

LONG VALLEY DEEP DRILLING scientific drilling project

Scientific Drilling Project by DOSECC Core Drilling Services

The Long Valley Exploratory Well (LVEW) is situated on the resurgent dome of Long Valley Caldera, at the boundary of the Sierra Nevada and the Basin and Range Province in eastern California (Figure 1). Long Valley Caldera was created by a catastrophic, voluminous eruption of high-silica rhyolite, approximately 760,000 years ago. Since that time, minor volcanic activity in the area has recurred every few hundred years and major volcanic episodes associated with the caldera magma system occur at a frequency of about every 200,000 years (Bailey, 1989). LVEW was drilled to assess the potential of a deep geothermal resource beneath the resurgent dome, help improve assessments of volcanic risk from major or minor volcanic eruptions emanating from the central caldera, and provide a “hole of opportunity” for testing drilling instruments and technology (Figure 2).

LVEW began in 1989 as an engineering and scientific research well for the U. S. Department of Energy’s Magma Energy Program. Original plans called for drilling to a total depth of 18,000 feet to be accomplished in four phases. Phase I was completed in 1989 to a depth of 2650 feet. In 1991, Phase II deepened the hole to 7200 feet, with emphasis on exploring the geothermal energy potential of a deep magmatic source. Data from Phase II suggested that downhole temperatures, which reached 100¡C at the bottom of the well, were too cool for geothermal development (Sass and others, 1991), although, mineralogical evidence suggested that, in the past, the temperatures had been as high as 350¡C for the same depth (McConnell and others, 1997).

LONG VALLEY DEEP DRILLING 2

Figure 1 – Long Valley location map.

The Long Valley Coring Project (LVCP), operated during July through September 1998, was the third phase of drilling at LVEW. This phase deepened the existing hole from 7180 feet to a final depth of 9831 feet (2188 to 2996 meters) during the summer of 1998. Unlike the previous two phases of drilling in which core was recovered only at specific intervals, LVCP recovered continuous core throughout the entire section. LVCP was initiated to obtain additional information on magmatic processes both past and present in the caldera. It was envisioned that by deepening the preexisting borehole it would be possible to gain information about the presence of small magmatic intrusions, the brittle-ductile transition above the inferred magma body, the nature of the temperature gradient, and perhaps the presence of a magma chamber or neogranite. In addition, drilling was expected to provide more details about geothermal energy potential, volcanic hazards and the stratigraphy of Long Valley Caldera, as well as to field-test a newly developed hybrid drilling unit (Sass and others, 1998). To achieve these goals, LVCP was slated to deepen the existing hole to a depth between 11,500 and 13,000 feet. However, unexpected delays and short bit runs, attributed to thick layers of metaquartzite, decreased daily recovered footage and cost precious drilling time and money. The final depth achieved was 9831 feet. Nevertheless, the retrieval of over 2500 feet of continuous core provided geologists with a wealth of new data and material for further research efforts.

LVEW Stratigraphy

During Phases I and II, LVEW passed through the volcanic caldera fill and into the metamorphosed intrusions and metasedimentary basement rock. LVCP continued to drill through a thick sequence of metasedimentary rocks (Figure 3). The metamorphic material is correlative with the Mt Morrison roof pendant which is intruded by Sierra Nevada granites to the west and south of the drillsite. Specifically, graphitic, banded metapelites, metaquartzites, calcareous sandstones, and calc-silicate rocks most resembles the sequence of metamorphic rocks that make up the nearby Ordovician Mt. Aggie Formation (McConnell and others, 1998). Metamorphic patterns in the recovered core are indicative of several episodes of deformation suggesting that multiple processes of metamorphism were active, either simultaneously or sequentially, in the area. Indeed, an increase in contact metamorphic grade in the deepest portion of the core suggests that drilling approached the contact aureole of an intrusive body. Possible sources include Cretaceous age Sierra Nevada granite or neogranite representing the chilled margin from the Long Valley Caldera magma chamber.

LVCP drilling intersected several igneous intrusions in the metamorphic rocks. Their chemistry and alteration vary greatly, suggesting intrusion at different times or multiple episodes of emplacement and magmatic activity in the caldera. Several intrusions are petrographically similar to hypabyssal sills in the overlying volcanic fill found during the earlier phases of drilling. Their cumulative thickness and presence is suggested to account for much of the elevation of the resurgent dome (McConnell and others, 1995). These intrusions may ultimately provide information about the underlying magma chamber.

The presence or absence of geothermal potential should be reflected in changes of temperature with depth. Temperature’s in LVEW are unexpectedly low (Figure 4). The last kilometer in the well is isothermal and the bottomhole temperature remains just above 100 ¡C. Despite these anomalously low temperatures, the core provides abundant evidence of deep hot water circulation. Thick zones of hydrothermal alteration and open veins of pristine crystals of hydrothermal minerals, such as quartz, epidote, chlorite, sulfide minerals, and blade calcite at depths of 8500-8550 and 9100 feet, suggest that vigorous hot water circulation was present in the recent past

LONG VALLEY DEEP DRILLING 2

Figure 2 – Long Valley cross section

In addition to locally stretched and ductilely deformed metasedimentary rocks, the core contains lithologic and structural evidence of recent faulting. Faulting is indicated by fresh fault gouge, open vein brecciation, and open fractures. Two sections show the most significant evidence for recent faulting. Thick fault gauges occur between 8630 and 8910, presumable indicating the largest and most active faults. A deeper sequence stretches from approximately 9420 to 9800 feet, repeating the package of faulted rocks many times; suggesting an active extensional fault zone. This depth coincides with the calculated hypocenters of the Long Valley Caldera seismic swarm from September 1997 to January 1998 (oral communication, Steve Hickman). This intriguing evidence for young and contemporaneous faulting may allow for interpretations of the state of stress in the area of the resurgent dome.

Future plans for the wellsite include continued temperature logging and the emplacement of a package of instruments including seismometers and flow meters to increase the monitoring capabilities of the Long Valley Observatory. A series of add-on science research projects are also underway including detailing geochemistry of fluid inclusions within the hydrothermal minerals, Alpha recoil track age determinations of volcanic rocks, and geophysical modeling of the thermal regime of the caldera.

[The above project summary was modified from Sacket et al., 1999.]

LONG VALLEY DEEP DRILLING 2

Related Publications

Bender-Lamb, Sylvia, Magma energy exploratory well, Long Valley Caldera, California Geology, 44 (4), p. 85-92, 1991.

Hill, David P., Sorey, Michael L., Ellsworth, William L., Sass, John H., Scientific drilling continues in Long Valley Caldera, California, Eos, Transactions, American Geophysical Union, 79 (36), p. 429, 432, 1998.

Martini, B. A., Cochran, S. A., Potts, D. C., Silver, E. A., Pickles, W. L., Carter, M. R., Priest, R. E., Wayne, B. M., White, W. T., III, Geobotanical characterization of a geothermal system using hyperspectral imagery; Long Valley Caldera, CA, USA, Anonymous, Proceedings of the thirteenth international conference; applied geologic remote sensing, Proceedings of the Thematic Conference on Geologic Remote Sensing, 13 (1), p. 337-341, 1999. Meeting: Thirteenth international conference on Applied geologic remote sensing, Vancouver, BC, Canada, March 1-3, 1999.

Sackett, Penelope C., McConnell, Vicki S., Roach, Angela L., Priest, Susan S., Sass, John H., Long Valley Coring Project, Inyo County, California, 1998; preliminary stratigraphy and images of recovered core, Open-File Report – U. S. Geological Survey , OF 99-0158, p. (1 disc), 1999.

Sass, John H., Finger, John T., McConnel, Vicki, The Long Valley coring project, Bulletin – Geothermal Resources Council, 27 (2), p. 44-46, 1997.

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LA Blind Thrusts

LA Blind Thrusts scientific drilling project, located in California, a current project that is institutionally-funded

Los Angeles Blind Thrusts

Scientific Drilling Project by DOSECC Core Drilling Services

LA Blind Thrusts project, located in California, a current project that is institutionally-funded.

This scientific drilling project was conducted in 1997 by DOSECC core drilling services.  Southern California is home to several blind thrust systems and other principal faults, some of which are exposed at the surface and vary in slip rates and earthquake recurrence intervals. Read more about the ramifications of this study in this NSF publication.

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Bass River Scientific Drilling Project

Bass River project, located in New Jersey, scientific drilling project

Bass River, New Jersey

Scientific Drilling Project by DOSECC Core Drilling Services

Bass River project, located in New JerseyBass River project, located in New Jersey, a 1996 project that was NSF (EAR and OCE), NJ Geological Survey, DE Geological Survey, USGS-funded.