HR: 1340h
AN: PP53B-1392    [Abstracts]
TI: Influence of Environmental Factors over the Incorporation of U, Cd, and Minor Metals into Foraminiferal Calcite: Results of Summer 2004 Culture Experiments
AU: * Russell, A D
EM: russell@geology.ucdavis.edu
AF: Department of Geology, One Shields Avenue, University of California, Davis, CA 95616 United States
AU: Hoenisch, B
AF: Lamont Doherty Earth Observatory, PO Box 1000, Palisades, NY 10964-1000 United States
AU: Spero, H
EM: spero@geology.ucdavis.edu
AF: Department of Geology, One Shields Avenue, University of California, Davis, CA 95616 United States
AU: Lea, D W
AF: Department of Geological Sciences, University of California, Santa Barbara, CA 93106-9630 United States
AB: During the summer of 2004, we conducted laboratory culture experiments with planktonic foraminifera ({\it O. universa} and {\it G. bulloides}) to constrain the relationships between U, Cd, Mg, and Sr and environmental factors (temperature, salinity, carbonate ion concentration, and light levels). In order to test the hypothesis that photosynthesis by algal symbionts influences U incorporation through its effect on local pH, we cultured {\it O. universa} (a symbiont-bearing species) under low light conditions in seawater modified to produce a range of carbonate ion concentrations. We will compare this curve to one we generated in previous experiments using {\it O. universa} cultured under high light conditions. We also cultured {\it G. bulloides} (a symbiont-free species) in seawater of variable carbonate. In addition, we conducted experiments to evaluate the influence of salinity and temperature on U in {\it G. bulloides}, and the influence of salinity and temperature in {\it O. universa}. Finally, we evaluated the influence of temperature on Cd in {\it G. bulloides}. We will report the results of these experiments at the Fall AGU Meeting.
DE: 4267 Paleoceanography
DE: 1045 Low-temperature geochemistry
DE: 1065 Trace elements (3670)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2004 AGU Fall Meeting