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Critical Zone Observatory (CZO)


Critical Zone Observatory (CZO) Scientific Drilling Project

critical-zone-scientific-drillingThis is a NSF- funded scientific drilling project in California’s Sierra Nevada conducted by the DOSECC core drilling services team in 2013.  This overview is from their website, CriticalZone.org:

Spearheaded by colleagues at the University of Wyoming, researchers have been participating in a number of weathering studies investigating long-term versus short-term rates of erosion (sediment basins and solute fluxes versus cosmogenic nuclides and regolith geochemistry), landscape evolution, “stepped topography” and the role of bare rock in shaping landscapes, the role of dust in pedogenesis and nutrient supply to the forests in and around the CZO (from isotopic tracers), and the origins of coarse sediment in streams (also from isotopic tracers).

Geophysical imaging of weathered layers at the CZO has been studied over the past two summers to provide 2D and 3D knowledge of the subsurface. Methods of geophysical investigation include seismic refraction and resistivity. Tests on hypotheses include what controls the thickness of the subsurface (weathering and erosion), and how much water is stored in the subsurface (porosity versus depth).

Future studies focus on cosmogenic nuclide method development (10Be in magnetite), drilling and coring in partnership with DOSECC (Drilling, Observation and Sampling of the Earths Continental Crust).