Biogenic sedimentation in the equatorial Pacific: Carbon cycling and paleoproduction, 12-24 Ma
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The equatorial Pacific is an important part of the global carbon cycle and has been affected by climate change through the Cenozoic (65Ma to present). We present a Miocene (12-24Ma) biogenic sediment record from Deep Sea Drilling Project (DSDP) Site 574 and show that a CaCO3 minimum at 17Ma was caused by elevated CaCO3 dissolution. When Pacific Plate motion carried Site 574 under the equator at about 16.2Ma, there is a minor increase in biogenic deposition associated with passing under the equatorial upwelling zone. The burial rates of the primary productivity proxies biogenic silica (bio-SiO2) and biogenic barium (bio-Ba) increase, but biogenic CaCO3 decreases. The carbonate minimum is at17Ma coincident with the beginning of the Miocene climate optimum; the transient lasts from 18 to 15Ma. Bio-SiO2 and bio-Ba are positively correlated and increase as the equator was approached. Corg is poorly preserved, and is strongly affected by changing carbonate burial. Terrestrial 232Th deposition, a proxy for aeolian dust, increases only after the Site 574 equator crossing. Since surface production of bio-SiO2, bio-Ba, and CaCO3 correlate in the modern equatorial Pacific, the decreased CaCO3 burial rate during the Site 574 equator crossing is driven by elevated CaCO 3 dissolution, representing elevated ocean carbon storage and elevated atmospheric CO2. The length of the 17Ma CaCO3 dissolution transient requires interaction with a slow part of the carbon cycle, perhaps elevated mantle degassing associated with the early stages of Columbia River Basalt emplacement. 2012 by the American Geophysical Union.
author list (cited authors)
Piela, C., Lyle, M., Marcantonio, F., Baldauf, J., & Olivarez Lyle, A.