Equatorial Pacific Reactive Phosphorus Accumulation Rates across the Eocene/Oligocene Transition

Details Equatorial Pacific Reactive Phosphorus Accumulation Rates across the Eocene/Oligocene Transition Equatorial Pacific Reactive Phosphorus Accumulation Rates across the Eocene/Oligocene Transition

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmpp11a0232f&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #PP11A-0232

Physics

0428 Carbon Cycling (4806), 4845 Nutrients And Nutrient Cycling (0470, 1050), 4900 Paleoceanography (0473, 3344), 4924 Geochemical Tracers

Scientific paper

Paired benthic foraminiferal stable isotope and trace metal records from ODP Site 1218 in the equatorial Pacific have shown that the Eocence/Oligocene (E/O) transition (~34 Ma) represents a major increase in Antarctic ice accumulation and a rapid deepening of the global calcite compensation depth (CCD) occurring in two steps [e.g., Lear et al., 2000; Lear et al., 2004; Coxall et al., 2005; Palike et al., 2006]. Simultaneous increases in biogenic mass accumulation rates (MARs) around Australia and in the Atlantic Ocean have been interpreted as representing increased productivity and/or organic carbon (C) burial possibly linked to cooling and ice sheet growth [Diester-Hass and Zahn, 2001; Anderson and Delaney, 2005]. Because the global CCD deepens across the transition, there is a need to distinguish organic C burial changes from CCD changes. We are determining reactive phosphorus (P, micromol P cm-2 kyr-1) MARs as an indicator of organic C burial for Site 1218 to help constrain the relative role of productivity during the E/O climatic transition. Reactive phosphorus (the sum of oxide associated, authigenic, and organic P; sequentially extracted from bulk sediment), delivered to the sediment water interface with organic C, is well preserved in oxygenated sediments. Preliminary results show an order of magnitude decrease in reactive P concentrations (from ~100 to ~10 micromol P g-1) across the E/O boundary. This may indicate that absolute organic C burial as well as the ratio of organic C burial to calcite burial may have decreased across the E/O transition in the equatorial Pacific upwelling zone.

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