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- W198468280 abstract "Carbonate dissolution changes across the Eocene/Oligocene boundary at Ocean Drilling Program Site 748 in the southern Indian Ocean were studied in detail based on changes in the calcareous nannofossil genus Chiasmolithus. There is an abrupt increase in carbonate dissolution near the top of subchron C13r (about 33.6 Ma in the time scale of Cande and Kent [1992]), coincident with an abrupt increase in cool-water taxa of calcareous nannofossils and the increase in [delta][sup 18]O and [delta][sup 13]C of planktonic foraminifers. The authors interpret that the carbonate dissolution spike was caused by an abrupt increase in marine productivity due to a global cooling as indicated by the nannofossil and oxygen isotope data. Sharp cooling increased nutrient supply to the surface ocean through stronger upwelling, which led to increase in productivity. An increase in carbonate production in the surface ocean decreased the carbonate ion concentration in the ocean and led to increased dissolution of carbonate on the sea floor although the increased supply of carbonate to the sea floor may have suppressed the carbonate compensation depth. Increased productivity also increased the flux of organic matter to the sea floor where carbon dioxide released from oxidation of the organic matter enhanced dissolution ofmore » carbonate. The increase in planktonic foraminiferal [delta][sup 13]C values also indicates an increase in productivity. This appears to be an excellent example of global cooling related to increased productivity, which serves as a positive feedback by drawing down carbon dioxide from the atmosphere and reducing the greenhouse effect.« less" @default.
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- W198468280 date "1993-03-01" @default.
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- W198468280 title "Cooling event in the earliest oligocene" @default.
- W198468280 hasPublicationYear "1993" @default.
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