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Isotopic evidence for glaciation during the Cretaceous supergreenhouse

Isotopic evidence for glaciation during the Cretaceous supergreenhouse
Isotopic evidence for glaciation during the Cretaceous supergreenhouse
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 18O excursions in marine limestones suggest that glaciation events may have punctuated this episode of extreme warmth. New 18O 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.
0036-8075
189-192
Bornemann, André
57f1da93-2b5f-4f6d-a0b6-2ce8cd918d89
Norris, Richard D.
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Friedrich, Oliver
680f066c-a4b1-4647-beb3-281addc1ee17
Beckmann, Britta
fc0a01b4-bf50-4fb6-ad25-6346261b3668
Schouten, Stefan
0d0291ca-b8dc-48a2-b61c-798c650ec1fd
Sinninghe Damste, Jaap S.
a7450030-77b6-4f15-b31f-4ffe021eea25
Vogel, Jennifer
fd55047d-fdc5-402c-92f4-1ee61f53ebea
Hofmann, Peter
2b1a50a8-3439-446d-a1f6-2b32d138dbfb
Wagner, Thomas
a7b3bf6c-e8af-4ce6-bf76-8ed080aa7c63
Bornemann, André
57f1da93-2b5f-4f6d-a0b6-2ce8cd918d89
Norris, Richard D.
9e0dfa1e-0c69-4666-bbf9-a5a14909d8f9
Friedrich, Oliver
680f066c-a4b1-4647-beb3-281addc1ee17
Beckmann, Britta
fc0a01b4-bf50-4fb6-ad25-6346261b3668
Schouten, Stefan
0d0291ca-b8dc-48a2-b61c-798c650ec1fd
Sinninghe Damste, Jaap S.
a7450030-77b6-4f15-b31f-4ffe021eea25
Vogel, Jennifer
fd55047d-fdc5-402c-92f4-1ee61f53ebea
Hofmann, Peter
2b1a50a8-3439-446d-a1f6-2b32d138dbfb
Wagner, Thomas
a7b3bf6c-e8af-4ce6-bf76-8ed080aa7c63

Bornemann, André, Norris, Richard D., Friedrich, Oliver, Beckmann, Britta, Schouten, Stefan, Sinninghe Damste, Jaap S., Vogel, Jennifer, Hofmann, Peter and Wagner, Thomas (2008) Isotopic evidence for glaciation during the Cretaceous supergreenhouse. Science, 319 (5860), 189-192. (doi:10.1126/science.1148777).

Record type: Article

Abstract

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 18O excursions in marine limestones suggest that glaciation events may have punctuated this episode of extreme warmth. New 18O 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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Published date: 11 January 2008

Identifiers

Local EPrints ID: 50052
URI: https://eprints.soton.ac.uk/id/eprint/50052
ISSN: 0036-8075
PURE UUID: 1ec5364d-ab1d-4a72-b707-37783ef5e78c

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Date deposited: 16 Jan 2008
Last modified: 13 Mar 2019 20:52

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Contributors

Author: André Bornemann
Author: Richard D. Norris
Author: Oliver Friedrich
Author: Britta Beckmann
Author: Stefan Schouten
Author: Jaap S. Sinninghe Damste
Author: Jennifer Vogel
Author: Peter Hofmann
Author: Thomas Wagner

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