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Abrupt deep-sea warming at the end of the Cretaceous

Liangquan Li and Gerta Keller
Abrupt deep-sea warming at the end of the Cretaceous
Geology (Boulder) (November 1998) 26 (11): 995-998

Abstract

Climatic and oceanographic variations during the last 2 m.y. of the Maastrichtian inferred from high-resolution (10 k.y.) stable isotope analysis of the mid-latitude South Atlantic Deep Sea Drilling Project Site 525 reveal a major warm pulse followed by rapid cooling prior to the Cretaceous-Tertiary boundary. Between 66.85 and 65.52 Ma, cool but fluctuating temperatures average 9.9 and 15.4 degrees C in intermediate and surface waters, respectively. This interval is followed by an abrupt short-term warming between 65.45 and 65.11 Ma, which increased temperatures by 2-3 degrees C in intermediate waters, and decreased the vertical thermal gradient to an average of 2.7 degrees C. This warm pulse may be linked to increased atmospheric pCO (sub 2) , increased poleward heat transport, and the switch of an intermediate water source from high to low-middle latitudes. During the last 100 k.y. of the Maastrichtian, intermediate and surface temperatures decreased by an average of 2.1 and 1.4 degrees C, respectively, compared to the maximum temperature between 65.32 and 65.24 Ma.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 26
Serial Issue: 11
Title: Abrupt deep-sea warming at the end of the Cretaceous
Affiliation: Princeton University, Department of Geosciences, Princeton, NJ, United States
Pages: 995-998
Published: 199811
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 21
Accession Number: 1999-000416
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
S29°04'15" - S29°04'14", E02°59'07" - E02°59'08"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199901
Program Name: DSDPDeep Sea Drilling Project
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