Isotopic evidence for glaciation during the Cretaceous supergreenhouse

被引：208

作者：

Bornemann, Andre ^{[1
,2
]}

Norris, Richard D. ^{[1
]}

Friedrich, Oliver ^{[1
,3
]}

Beckmann, Britta ^{[4
]}

Schouten, Stefan ^{[5
]}

Damste, Jaap S. Sinninghe ^{[5
]}

Vogel, Jennifer ^{[1
]}

Hofmann, Peter ^{[4
]}

Wagner, Thomas ^{[6
]}

机构：

[1] Univ Calif San Diego, Scripps Inst Oceanog, Geosci Res Div, La Jolla, CA 92093 USA

[2] Univ Leipzig, Inst Geophys & Geol, D-04103 Leipzig, Germany

[3] Natl Ocean Ctr, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England

[4] Univ Cologne, Inst Geol & Mineral, D-50674 Cologne, Germany

[5] Netherlands Inst Sea Res, Dept Marine Biogeochem & Toxicol, NL-1790 AB Den Burg, Netherlands

[6] Univ Newcastle, Sch Civil Engn & Geosci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

来源：

SCIENCE | 2008年 / 319卷 / 5860期

关键词：

D O I：

10.1126/science.1148777

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 degrees C. High- amplitude sea- level changes and positive delta O-18 excursions in marine limestones suggest that glaciation events may have punctuated this episode of extreme warmth. New delta O-18 data from the tropical Atlantic show synchronous shifts similar to 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.

引用

页码：189 / 192

页数：4

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