Oberhänsli, Hedi; Hemleben, Christoph (1984): Abundance of Globigerinoides sacculifer and Globigerinoides ruber and oxygen and carbon stable isotopes of different planktonic foraminifers at DSDP Holes 78-541 and 78-543 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.808886, Supplement to: Oberhänsli, H; Hemleben, C (1984): Stable isotope record of the Pliocene and Pleistocene planktonic foraminifers from Leg 78A, Sites 541 and 543, on the Barbados Ridge Complex. In: Biju-Duval, B; Moore, JC; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 78A, 499-508, https://doi.org/10.2973/dsdp.proc.78a.125.1984
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Abstract:
The stable isotope study of monospecific planktonic foraminifer samples recovered at Sites 541 and 543 during Deep Sea Drilling Project Leg 78A indicates a warming during the early Pliocene about 4.7 to 4.3 Ma. The changes in the late Pliocene oxygen isotope record around 2.9 to 2.7 Ma coincide with changes in the circulation pattern resulting from the closure of the Panama seaway and the beginning of the Northern Hemisphere glaciation. The Pleistocene record is characterized by 0.5 to 1.0 per mil fluctuations in the d18O record. These fluctuations reflect salinity changes, rather than temperature changes, as indicated by Globigerinoides ruber and G. sacculifer abundances. The salinity changes may be explained by a drifting of (1) the highly saline Central Water Mass of the southern Sargasso Sea, and (2) lower-salinity ocean water displaced by the northward shift of the Intertropical Convergence Zone into the Caribbean region during cooler intervals.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 15.616150 * Median Longitude: -58.691000 * South-bound Latitude: 15.520000 * West-bound Longitude: -58.728300 * North-bound Latitude: 15.712300 * East-bound Longitude: -58.653700
Date/Time Start: 1981-02-13T00:00:00 * Date/Time End: 1981-02-28T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Oberhänsli, H; Hemleben, C (1984): (Table 1) Abundance of Globigerinoides sacculifer and Globigerinoides ruber and oxygen and carbon stable isotopes of different planktonic foraminifers at DSDP Hole 78-541. https://doi.org/10.1594/PANGAEA.808884
- Oberhänsli, H; Hemleben, C (1984): (Table 2) Abundance of Globigerinoides sacculifer and Globigerinoides ruber and oxygen and carbon stable isotopes of different planktonic foraminifers at DSDP Hole 78-543. https://doi.org/10.1594/PANGAEA.808885