Strontium isotope data from DSDP Sites 32-305 and 62-463 and ODP Sites 113-689 and 113-690 ...
Fluctuations in oxygen (d18O) and carbon (d13C) isotope values of benthic foraminiferal calcite from the tropical Pacific and Southern Oceans indicate rapid reversals in the dominant mode and direction of the thermohaline circulation during a 1 m.y. interval (71-70 Ma) in the Maastrichtian. At the o...
| Main Authors: | , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
1997
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.712680 https://doi.pangaea.de/10.1594/PANGAEA.712680 |
| Summary: | Fluctuations in oxygen (d18O) and carbon (d13C) isotope values of benthic foraminiferal calcite from the tropical Pacific and Southern Oceans indicate rapid reversals in the dominant mode and direction of the thermohaline circulation during a 1 m.y. interval (71-70 Ma) in the Maastrichtian. At the onset of this change, benthic foraminiferal d18O values increased and were highest in low-latitude Pacific Ocean waters, whereas benthic and planktic foraminiferal d13C values decreased and benthic values were lowest in the Southern Ocean. Subsequently, benthic foraminiferal d18O values in the Indo-Pacific decreased, and benthic and planktic d13C values increased globally. These isotopic patterns suggest that cool intermediate-depth waters, derived from high-latitude regions, penetrated temporarily to the tropics. The low benthic d13C values at the Southern Ocean sites, however, suggest that these cool waters may have been derived from high northern rather than high southern latitudes. Correlation with eustatic ... : Supplement to: Barrera, Enriqueta C; Savin, Samuel M; Thomas, Ellen; Jones, Charles E (1997): Evidence for thermohaline-circulation reversals controlled by sea-level change in the latest Cretaceous. Geology, 25(8), 715-718 ... |
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