Cretaceous stable isotopic record and sea surface temperture estimation for ODP Site 207-1259

The Turonian (93.5 to 89.3 million years ago) was one of the warmest periods of the Phanerozoic eon, with tropical sea surface temperatures over 35°C. High-amplitude sea-level changes and positive d18O excursions in marine limestones suggest that glaciation events may have punctuated this episode of...

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Bibliographic Details
Main Authors: Bornemann, André, Norris, Richard D, Friedrich, Oliver, Beckmann, Britta, Schouten, Stefan, Sinninghe Damsté, Jaap S, Vogel, Jennifer, Hofmann, Peter, Wagner, Thomas
Format: Dataset
Language:English
Published: PANGAEA 2008
Subjects:
207-1259
COMPCORE
Composite Core
Joides Resolution
Leg207
North Atlantic Ocean
Ocean Drilling Program
ODP
Antarctic
Antarc*
Ice cap
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.771889
https://doi.org/10.1594/PANGAEA.771889
Description
Summary:The Turonian (93.5 to 89.3 million years ago) was one of the warmest periods of the Phanerozoic eon, with tropical sea surface temperatures over 35°C. High-amplitude sea-level changes and positive d18O excursions in marine limestones suggest that glaciation events may have punctuated this episode of extreme warmth. New d18O data from the tropical Atlantic show synchronous shifts ~91.2 million years ago for both the surface and deep ocean that are consistent with an approximately 200,000-year period of glaciation, with ice sheets of about half the size of the modern Antarctic ice cap. Even the prevailing supergreenhouse climate was not a barrier to the formation of large ice sheets, calling into question the common assumption that the poles were always ice-free during past periods of intense global warming.

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