Stable carbon and oxygen isotope record of Maastrichtian sediments from DSDP Site 74-528 in the South Atlantic Ocean

The upper Maastrichtian interval of mid-latitude South Atlantic Deep Sea Drilling Project site 528 spans approximately the last 4 million years of the Cretaceous. The isotopic record of this sequence indicates that relatively large (0.5-1.0‰) late Maastrichtian oxygen and carbon isotopic shifts occu...

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Bibliographic Details
Main Authors: d'Hondt, Steven L, Lindinger, Matthias
Format: Other/Unknown Material
Language:English
Published: PANGAEA 1994
Subjects:
74-528
74-528_Site
COMPCORE
Composite Core
Deep Sea Drilling Project
DRILL
Drilling/drill rig
DSDP
Glomar Challenger
Leg74
South Atlantic/RIDGE
South Atlantic Ocean
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.703805
https://doi.org/10.1594/PANGAEA.703805
Description
Summary:The upper Maastrichtian interval of mid-latitude South Atlantic Deep Sea Drilling Project site 528 spans approximately the last 4 million years of the Cretaceous. The isotopic record of this sequence indicates that relatively large (0.5-1.0‰) late Maastrichtian oxygen and carbon isotopic shifts occurred on geologically short time scales (less than 100-500 kyr). Comparison with previous oxygen isotopic data suggests that in high- and mid-latitude southern oceans the multimillion-year Maastrichtian cooling trend largely resulted from geologically rapid climatic 'steps'. Coincidence of the largest carbon and oxygen isotopic excursions suggests that relatively large and geologically rapid changes in marine and atmospheric carbon content may have directly contributed to the long-term cooling of the Late Cretaceous 'greenhouse'.

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