New NASA project funded

NASA just funded our continued work on uranium isotope geochemistry through an award lead by Steve Romaniello at Arizona State University. The project is titled “Refining the geochemical toolkit for paleoredox reconstruction: uranium isotope behavior under suboxic, anoxic, and iron-rich conditions” and will include investigators from ASU, Iowa State University, George Mason University, and myself at LBNL/UC Berkeley. This is a very exciting project linking laboratory experiments, modern systems experiencing the U redox cycle and examining variations in U in the sedimentary record.

 A summary of U isotope observations in the geologic record. We do not know if changes in the U isotope composition of the carbonate sink represents changes in the amount of U exported by reducing reactions or changes in the size of the isotopic fractionation due to changes in the reductants, seawater chemistry or other unidentified phenomena.

A summary of U isotope observations in the geologic record. We do not know if changes in the U isotope composition of the carbonate sink represents changes in the amount of U exported by reducing reactions or changes in the size of the isotopic fractionation due to changes in the reductants, seawater chemistry or other unidentified phenomena.