HR: 11:40h
AN: OS52A-06    [Abstracts]
TI: Barium, Barite, and Export Production - Lessons in the Development of a New Proxy
AU: * Paytan, A
EM: apaytan@pangea.stanford.edu
AF: Stanford University, Geological and Environmental Sciences, Stanford, CA 94305 United States
AB: The quantitative application of Ba as a proxy for export production in the ocean, first suggested by Dymond et al., (1992), is widely used for paleoproductivity studies at different oceanic settings and time scales. As for any promising and exciting proxy, the more we look the more complex it becomes. It is rare that in a first publication all of the potential complications and pit falls are identified and laid out. The evolution - from prediction, through testing, and refinement to better understanding and application, of the Ba, barite, productivity proxy, following the detailed outline of Jack's intuition and understanding will be presented. New trace element (Sr/Ba, SeO4/SO4) and isotope data (del44Ca) and barite accumulation rate results, that shed light on the mechanisms of barite formation and relation to export production will be discussed.
DE: 4805 Biogeochemical cycles (1615)
DE: 4825 Geochemistry
DE: 4835 Inorganic marine chemistry
DE: 4875 Trace elements
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting