(Table 1) Datum-levels from DSDP Hole 80-548, supplement to: Loubere, Paul (1987): Late Pliocene variations in the carbon isotope values of North Atlantic benthic Foraminifera: Biotic control of the isotopic record? Marine Geology, 76, 45-56

Analyses of benthic Foraminifera carbon isotope values were made in 172 samples from the Late Pliocene at DSDP Site 548 which is located in the Northeast Atlantic on the continental slope southwest of Ireland (1253 m water depth). The carbon isotope record is quite stable from about 3.4 to 2.5 Ma, a...

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Bibliographic Details
Main Author: Loubere, Paul
Format: Dataset
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 1987
Subjects:
DEPTH, sediment/rock
Depth, top/min
Depth, bottom/max
Ageprofile Datum Description
Age model
Age, maximum/old
Age, comment
Drilling/drill rig
Leg80
Glomar Challenger
Deep Sea Drilling Project DSDP
North Atlantic
Northeast Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.761043
https://doi.pangaea.de/10.1594/PANGAEA.761043
Description
Summary:Analyses of benthic Foraminifera carbon isotope values were made in 172 samples from the Late Pliocene at DSDP Site 548 which is located in the Northeast Atlantic on the continental slope southwest of Ireland (1253 m water depth). The carbon isotope record is quite stable from about 3.4 to 2.5 Ma, and contrasts with the record at Site 552A in the North Atlantic (2311 m water depth) which is much more variable for this time period. The carbon record at Site 548 is also consistently more negative than that of Site 552A. After 2.5 Ma the benthic carbon isotope record of Uvigerina at Site 548 becomes extremely variable with large negative deviations. These isotopic variations might be associated with paleoceanic circulation changes caused by glaciation between 2.5 and 2 Ma. However, paired analyses of Uvigerina and Cibicidoides species for 38 samples within the glacial interval, yield carbon isotopic records which are quite different from one another. The Uvigerina record contains larger negative deviations than does the Cibicidoides record. Also, the isotopic difference between Uvigerina and Cibicidoides increases during glaciations and in a long term trend from 2.5 to 2.0 Ma. The lack of covariance between the Uvigerina and Cibicidoides carbon isotope records indicates that, after 2.5 Ma at Site 548, biotic factors influenced the benthic isotopic record.

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