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  • 1
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    Biogenic sedimentation of DSDP Site 85-574
    PANGAEA
    In:  Supplement to: Piela, Christine; Lyle, Mitchell W; Marcantonio, Franco; Baldauf, Jack G; Olivarez Lyle, Annette (2012): Biogenic sedimentation in the equatorial Pacific: Carbon cycling and paleoproduction, 12–24 Ma. Paleoceanography, 27(2), PA2204, https://doi.org/10.1029/2011PA002236
    Details
    Publication Date: 2023-06-27
    Description: The equatorial Pacific is an important part of the global carbon cycle and has been affected by climate change through the Cenozoic (65 Ma to present). We present a Miocene (12-24 Ma) biogenic sediment record from Deep Sea Drilling Project (DSDP) Site 574 and show that a CaCO3 minimum at 17 Ma was caused by elevated CaCO3 dissolution. When Pacific Plate motion carried Site 574 under the equator at about 16.2 Ma, 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 at ~17 Ma coincident with the beginning of the Miocene climate optimum; the transient lasts from 18 to 15 Ma. 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 CaCO3 dissolution, representing elevated ocean carbon storage and elevated atmospheric CO2. The length of the 17 Ma 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.
    Keywords: 85-574_Site; COMPCORE; Composite Core; Deep Sea Drilling Project; DSDP; Glomar Challenger; Leg85; North Pacific/TROUGH
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    (Table 2) Average accumulation rates for DSDP Site 85-574
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 85-574_Site; Accumulation rate, barium; Accumulation rate, calcium carbonate; Accumulation rate, mass; Accumulation rate, opal; Accumulation rate, thorium; Accumulation rate, total organic carbon; Accumulation rate, uranium; AGE; Age, maximum/old; Age, minimum/young; Barium; Calcium carbonate; Carbon, organic, total; COMPCORE; Composite Core; Deep Sea Drilling Project; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg85; North Pacific/TROUGH; Opal, biogenic silica; Paleolatitude; Paleolongitude; Sample code/label; Sample code/label 2; Sedimentation rate; Thorium; Uranium
    Type: Dataset
    Format: text/tab-separated-values, 522 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    (Table 1) Chronostratigraphy for DSDP Site 85-574
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 85-574_Site; AGE; Age model; Age model, optional; Ageprofile Datum Description; COMPCORE; Composite Core; Deep Sea Drilling Project; DEPTH, sediment/rock; DSDP; Glomar Challenger; Group; Leg85; North Pacific/TROUGH
    Type: Dataset
    Format: text/tab-separated-values, 417 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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