Early Paleogene variations in the carbonate compensation depth of the Indian Ocean; new constraints using old boreholes (DSDP Leg 22)

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Author(s): Slotnick, B. S.; Lauretano, V.; Dickens, G. R.; Sluijs, A.; Lourens, L.
Author Affiliation(s): Primary:
Rice University, Department of Earth Science, Houston, TX, United States
Utrecht University, Faculty of Geosciences, Netherlands
Volume Title: AGU 2011 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2011; American Geophysical Union 2011 fall meeting, San Francisco, CA, Dec. 5-9, 2011. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Stable carbon isotope (δ13C) records across the early Paleogene (65-50 Ma) show a series of pronounced long-term and short-term variations that likely represent major changes in carbon fluxes to and from the ocean and atmosphere. To better constrain the cause of these carbon cycle changes, variations in carbonate saturation profiles (lysocline and calcite compensation depth, CCD) are needed from multiple ocean basins. Although several compilations have been generated for the late Paleogene and Neogene, past fluctuations in the lysocline and CCD remain poorly documented for the Early Paleogene. This is especially true for the Indian Ocean. More than 400 lower Paleogene sediment samples from DSDP Sites 213, 214, and 215 were analyzed for their carbonate content and stable isotope composition. The sequences were dated with bio- and magneto-stratigraphy to produce mass accumulation rates (MARs) of bulk sediment, and the carbonate and non-carbonate fractions. The records, when combined with each other and other carbonate and isotope records, provide insight as to how carbonate saturation profiles varied during the early Paleogene. Preliminary data suggest a long-term drop in carbonate saturation horizons from 57 to 51 Ma with short-term rises across intervening rapid carbon injection (hyperthermals) events.
Year of Publication: 2011
Research Program: DSDP Deep Sea Drilling Project
Key Words: 07 Marine Geology and Oceanography; 12 Stratigraphy, Historical Geology and Paleoecology; C-13; Carbon; Cenozoic; DSDP Site 213; DSDP Site 214; DSDP Site 215; Deep Sea Drilling Project; Indian Ocean; Isotopes; Leg 22; Lower Paleogene; Lysoclines; Neogene; Ninetyeast Ridge; Paleogene; Sea water; Stable isotopes; Tertiary
Coordinates: S101243 S101242 E0935347 E0935346
S112013 S112013 E0884305 E0884305
S080718 S080718 E0864730 E0864730
Record ID: 2015103335
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