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


Autoria(s): Oberhänsli, Hedi; Hemleben, Christoph
Cobertura

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

Data(s)

14/03/1984

Resumo

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.

Formato

application/zip, 2 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.808886

doi:10.1594/PANGAEA.808886

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Oberhänsli, Hedi; Hemleben, Christoph (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, doi:10.2973/dsdp.proc.78a.125.1984

Palavras-Chave #Counting >250 µm fraction; Deep Sea Drilling Project; DSDP; G. obliquus d13C; G. obliquus d18O; G. ruber; G. ruber w d13C; G. ruber w d18O; G. sacculifer; G. sacculifer d13C; G. sacculifer d18O; Globigerinoides obliquus, d13C; Globigerinoides obliquus, d18O; Globigerinoides ruber; Globigerinoides ruber white, d13C; Globigerinoides ruber white, d18O; Globigerinoides sacculifer; Globigerinoides sacculifer, d13C; Globigerinoides sacculifer, d18O; Label; Mass spectrometer VG Micromass 903; ODP sample designation; P. obliqu. d13C; P. obliqu. d18O; Pulleniatina obliquiloculata, d13C; Pulleniatina obliquiloculata, d18O; S. dehiscens d13C; S. dehiscens d18O; Sample code/label; Sphaeroidinella dehiscens, d13C; Sphaeroidinella dehiscens, d18O
Tipo

Dataset