This project seeks to use isotopic tracers to understand the reactivity and fate of CO2 in the subsurface. Research includes the investigation of natural analogues for CO2 sequestration, including the Red Mountain Mining District, Livermore, CA and saline aquifers throughout the U.S. that have been naturally or intensionally exposed to elevated levels of CO2. Laboratory investigations will explore how the kinetics of isotope exchange reactions can be used to better understand reaction rates. (Maher, Bird, Brown, Benson).
Research in this area is focused on coupling low-temperature dating techniques such as U/Pb or 230-Th/U using the multi-collector ICP-MS and the SHIRMP-RG with the development and refinement of new paleoclimate proxies such as U and SI isotopes that are sensitive to past moisture levels (Maher).
Sampling mine drainage at the NSF DUSEL. Homestake Mine
General areas of interest include:
Graduate student Kim Lau is using variations in uranium isotopes to reconstruct past seawater conditions.