Piela, Christine; Lyle, Mitchell W; Marcantonio, Franco; Baldauf, Jack G; Olivarez Lyle, Annette (2012): Biogenic sedimentation of DSDP Site 85-574 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.826109, Supplement to: Piela, C et al. (2012): Biogenic sedimentation in the equatorial Pacific: Carbon cycling and paleoproduction, 12–24 Ma. Paleoceanography, 27(2), PA2204, https://doi.org/10.1029/2011PA002236
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Abstract:
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.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 4.208700 * Longitude: -133.330200
Date/Time Start: 1982-04-11T00:00:00 * Date/Time End: 1982-04-11T00:00:00
Event(s):
85-574_Site * Latitude: 4.208700 * Longitude: -133.330200 * Date/Time: 1982-04-11T00:00:00 * Elevation: -4561.0 m * Penetration: 11.197 m * Recovery: 5.949 m * Location: North Pacific/TROUGH * Campaign: Leg85 * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 92 cores; 734.2 m cored; 0 m drilled; 81% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Piela, C; Lyle, MW; Marcantonio, F et al. (2012): (Table 1) Chronostratigraphy for DSDP Site 85-574. https://doi.org/10.1594/PANGAEA.826092
- Piela, C; Lyle, MW; Marcantonio, F et al. (2012): (Table 2) Average accumulation rates for DSDP Site 85-574. https://doi.org/10.1594/PANGAEA.826108