(Table T1) Stable oxygen and carbon isotopes of bulk carbonate from ODP Leg 207 sites

Stable isotopic values of 174 upper Campanian and Maastrichtian bulk carbonate samples from Demerara Rise, in the western tropical Atlantic (Ocean Drilling Program Leg 207, Sites 1257-1261), largely fall between 0 per mil and 2 per mil for d13C and between -2 per mil and -3 per mil for d18O. The rel...

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Bibliographic Details
Main Author: MacLeod, Kenneth G
Format: Dataset
Language:English
Published: PANGAEA 2006
Subjects:
207-1257A
207-1258A
207-1259A
207-1260A
207-1261A
207-1261B
Depth
composite
sediment/rock
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Event label
Intercore correlation
Joides Resolution
Leg207
Mass spectrometer Finnigan Delta Plus
North Atlantic Ocean
Ocean Drilling Program
ODP
Sample code/label
Walvis Ridge
Southeast Atlantic Ocean
δ13C
carbonate
δ18O
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.775981
https://doi.org/10.1594/PANGAEA.775981
Description
Summary:Stable isotopic values of 174 upper Campanian and Maastrichtian bulk carbonate samples from Demerara Rise, in the western tropical Atlantic (Ocean Drilling Program Leg 207, Sites 1257-1261), largely fall between 0 per mil and 2 per mil for d13C and between -2 per mil and -3 per mil for d18O. The relatively low values and high scatter of d13C values observed suggest secondary calcite with a remineralized organic carbon component was present in most to all samples analyzed. Oxygen isotopic data exhibit less scatter and values closer to those expected for contemporary sea-surface conditions than do carbon data. However, trends in d18O data at any one section do not correlate among sites using shipboard age estimates. Regardless of whether subsequent age estimates modify correlation among holes, diagenetic concerns will remain a significant complication in any efforts to study isotopic trends during the late Campanian-Maastrichtian at these sites.

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