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Geology; December 2003; v. 31; no. 12; p. 1069-1072; DOI: 10.1130/G19876.1
© 2003 Geological Society of America
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Extremely high sea-surface temperatures at low latitudes during the middle Cretaceous as revealed by archaeal membrane lipids

Stefan Schouten1, Ellen C. Hopmans1, Astrid Forster1, Yvonne van Breugel1, Marcel M.M. Kuypers*,1 and Jaap S. Sinninghe Damsté*,1

1 Department of Marine Biogeochemistry and Toxicology, Royal Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Den Burg, Texel, Netherlands

The middle Cretaceous (125–88 Ma) greenhouse world was characterized by high atmospheric CO2 levels, the general absence of polar ice caps, and much higher global temperatures than at present. Both {delta}18O-based and model-based temperature reconstructions indicate extremely high sea-surface temperatures (SSTs) at high latitudes. However, there are a number of uncertainties with SST reconstructions based on {delta}18O isotope data of foraminifera due to diagenetic overprinting effects and tenuous assumptions with respect to the {delta}18O value of Cretaceous seawater, the paleoecology of middle Cretaceous marine organisms and seawater pH. Here we applied a novel SST proxy (i.e., TEX86 [tetraether index of 86 carbon atoms], based on the membrane lipids of marine crenarchaeota) derived from middle Cretaceous sedimentary rocks deposited at low latitudes. The TEX86 proxy indicates that tropical SSTs in the proto–North Atlantic were at 32–36 °C during the early Albian and late Cenomanian–early Turonian. This finding agrees with SST estimates based on {delta}18O paleothermometry of well-preserved foraminifera as well as global circulation model calculations. The TEX86 proxy indicates cooler SSTs (27–32 °C) for the equatorial Pacific during the early Aptian, which is in agreement with SST estimates based on {delta}18O paleothermometry.

Key Words: Cretaceous • sea-surface temperature • TEX86 • tropics




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