Pb and Nd Isotopic Evolution of Global Seawater During the Last 60 Ma from Ferromanganese Crusts
M. Frank, R. K. O'Nions and J. R. Hein
Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, U.K.
U.S. Geological Survey, 345 Middlefield Road, MS-999, Menlo Park, CA 94025, USA