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New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere

Leon J. Clarke and Hugh C. Jenkyns
New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere
Geology (Boulder) (August 1999) 27 (8): 699-702

Abstract

A new composite delta (super 18) O record, generated from calcareous fine-fraction and bulk sediments from the Exmouth Plateau, details long-term Cretaceous climatic change at mid-latitudes in the Southern Hemisphere. Assessment of new and previously published delta (super 18) O data indicates that a mid-Cretaceous global climatic optimum was achieved sometime between the time of the Cenomanian-Turonian boundary and the middle Turonian, when surface-ocean paleotemperatures were the highest of the past 115 m.y. Periods of cooling and warming that reversed the general patterns were superimposed on long-term Aptian-Turonian warming and Turonian-Maastrichtian cooling trends, respectively. Extrapolation of Southern Hemisphere paleotemperature trends to Maastrichtian paleotemperature data from a low-latitude Pacific guyot implies that maximum mid-Cretaceous low-latitude paleotemperatures could have been in excess of 33 degrees C.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 27
Serial Issue: 8
Title: New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere
Affiliation: University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Pages: 699-702
Published: 199908
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 24
Accession Number: 1999-055482
Categories: StratigraphyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 9957
Illustration Description: illus. incl. 2 tables, sketch map
S19°53'15" - S19°53'14", E112°15'14" - E112°15'15"
S20°35'12" - S20°35'11", E112°12'31" - E112°12'32"
S19°55'56" - S19°55'55", E110°27'14" - E110°27'15"
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: 199919
Program Name: ODPOcean Drilling Program
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