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Valanginian isotope variation in glendonites and belemnites from Arctic Svalbard; transient glacial temperatures during the Cretaceous greenhouse

Gregory D. Price and Elizabeth V. Nunn
Valanginian isotope variation in glendonites and belemnites from Arctic Svalbard; transient glacial temperatures during the Cretaceous greenhouse
Geology (Boulder) (March 2010) 38 (3): 251-254

Abstract

Oxygen and carbon isotope data from Cretaceous (Valanginian) glendonites and belemnites from Arctic Svalbard are presented. Oxygen isotope data from well-preserved glendonites, in conjunction with the ikaite to glendonite pseudomorph transition temperature, are used to provide an estimate of the oxygen isotope composition of ambient seawater. Calculation of such a factor is essential for robust paleotemperature estimates. Using this methodology, our paleotemperatures calculated from the oxygen isotope compositions of coexisting belemnites yield cool temperatures (4-7 degrees C) consistent with transient glacial polar conditions during the Cretaceous greenhouse. Cool polar temperatures during the Cretaceous help reconcile geologic data with the simulations of general circulation models. Nevertheless, beyond this postulated and transient cool event within the Valanginian, the remainder of the isotope data are interpretable in terms of warm polar conditions during the Cretaceous greenhouse.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 38
Serial Issue: 3
Title: Valanginian isotope variation in glendonites and belemnites from Arctic Svalbard; transient glacial temperatures during the Cretaceous greenhouse
Affiliation: University of Plymouth, School of Geography, Earth and Environmental Sciences, Plymouth, United Kingdom
Pages: 251-254
Published: 201003
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 36
Accession Number: 2010-030932
Categories: StratigraphyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2010066
Illustration Description: illus. incl. strat. col., sketch map
N78°00'00" - N79°00'00", E15°30'00" - E16°00'00"
Secondary Affiliation: Johannes Gutenberg-Universitaet Mainz, DEU, Federal Republic of Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201018
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