Calculation of paleoproductivity during the Eocene-Oligocene transition of ODP Site 113-689 ...
High-resolution records of carbon and oxygen isotopes and benthic foraminiferal accumulation rates for the Eocene-Oligocene section at Ocean Drilling Program Site 689 (Maud Rise, Weddell Sea; paleodepth about 1500 m) were used to infer variations in paleoproductivity in relation to changes in climat...
| Main Authors: | , |
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| Format: | Dataset |
| Language: | English |
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PANGAEA
1996
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| Online Access: | https://dx.doi.org/10.1594/pangaea.712516 https://doi.pangaea.de/10.1594/PANGAEA.712516 |
| Summary: | High-resolution records of carbon and oxygen isotopes and benthic foraminiferal accumulation rates for the Eocene-Oligocene section at Ocean Drilling Program Site 689 (Maud Rise, Weddell Sea; paleodepth about 1500 m) were used to infer variations in paleoproductivity in relation to changes in climate and ventilation of the deeper-water column. The benthic foraminiferal abundance and isotope records show short-term fluctuations at periodicities of 100 and 400 ka, implying orbitally driven climatic variations. Both records suggest that intermediate-depth water chemistry and primary productivity changed in response to climate. During the Eocene, productivity increased during cold periods and during cold-to-warm transitions, possibly as a result of increased upwelling of nutrient-rich waters. In the Oligocene, in contrast, productivity maxima occurred during intervals of low delta18O values (presumably warmer periods), when a proto–polar front moved to the south of the location of Site 689. This profound ... : Supplement to: Diester-Haass, Lieselotte; Zahn, Rainer (1996): Eocene-Oligocene transition in the Southern Ocean: History of water mass circulation and biological productivity. Geology, 24(2), 163-166 ... |
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