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Cooling and ice growth across the Eocene-Oligocene transition

Lear, Caroline Helen, Bailey, Trevor R., Pearson, Paul Nicholas, Coxall, Helen Kathrine and Rosenthal, Yair 2008. Cooling and ice growth across the Eocene-Oligocene transition. Geology 36 (3) , pp. 251-254. 10.1130/G24584A.1

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The Eocene-Oligocene (E-O) climate transition (ca. 34 Ma) marks a period of Antarctic ice growth and a major step from early Cenozoic greenhouse conditions toward today's glaciated climate state. The transition is represented by an increase in deep-sea benthic foraminiferal oxygen isotope (18O) values occurring in two main steps that reflect the temperature and 18O of seawater. Existing benthic Mg/Ca paleotemperature records do not display a cooling across the transition, possibly reflecting a saturation state effect on benthic foraminiferal Mg/Ca ratios at deep-water sites. Here we present data from exceptionally well preserved foraminifera deposited well above the calcite compensation depth that provide the first proxy evidence for an 2.5 °C ocean cooling associated with the ice growth. This permits interpretation of E-O 18O records without invoking Northern Hemisphere continental-scale ice.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Q Science > QE Geology
Uncontrolled Keywords: Eocene; Oligocene; climate; ice sheets; temperature; Cenozoic
Publisher: Geological Society of America
ISSN: 0091-7613
Last Modified: 04 Jun 2017 02:09

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