Uranium isotopes as a potential global-ocean redox proxy: a test from the Upper Pennsylvanian Hushpuckney Shale (Kansas, U.S.A.)

Achim Dirk Herrmann, Coastal Studies Institute, Baton Rouge, United States, Thomas J Algeo, University of Cincinnati Main Campus, Cincinnati, OH, United States, Gwyneth Williams Gordon, Arizona State Univ, METAL Lab, Tempe, AZ, United States and Ariel D Anbar, Arizona State University, Department of Chemistry, Tempe, AZ, United States