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A stable and hot Turonian without glacial delta (super 18) O excursions is indicated by exquisitely preserved Tanzanian Foraminifera

Kenneth G. MacLeod, Brian T. Huber, Alvaro Jimenez Berrocoso and Ines Wendler
A stable and hot Turonian without glacial delta (super 18) O excursions is indicated by exquisitely preserved Tanzanian Foraminifera
Geology (Boulder) (July 2013) 41 (10): 1083-1086

Abstract

A shift from the icehouse climate in which humans evolved to a Late Cretaceous-like greenhouse climate is an often-repeated cautionary prediction of the consequences of continued anthropogenic CO (sub 2) emissions. The corollary, that understanding the past might help predict the future, has justified many Late Cretaceous studies, but important questions remain about climate stability and sensitivity. New delta (super 18) O measurements of more than 1000 samples of exceptionally well preserved foraminifera (8 planktic and 11 benthic taxa) from two sites in Tanzania indicate that hot and remarkably stable conditions prevailed in the region during the Turonian, including during a proposed greenhouse glacial event. Planktic taxa have delta (super 18) O values largely between -4.0 per mil and -5.0 per mil, suggesting surface-water temperatures between 30 and 35 degrees C. Estimates for seafloor temperatures are between 18 and 25 degrees C. No parallel shifts in delta (super 18) O values are observed among planktic and benthic taxa, contradicting an often-cited line of evidence for greenhouse glaciations and supporting an effectively ice-free Turonian world.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 41
Serial Issue: 10
Title: A stable and hot Turonian without glacial delta (super 18) O excursions is indicated by exquisitely preserved Tanzanian Foraminifera
Affiliation: University of Missouri, Department of Geological Sciences, Columbia, MO, United States
Pages: 1083-1086
Published: 20130730
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 29
Accession Number: 2013-069354
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2013300
Illustration Description: illus. incl. sketch map
S10°00'00" - S09°45'00", E39°00'00" - E40°00'00"
Secondary Affiliation: Smithsonian Museum of Natural History, USA, United StatesRepsol Exploration, ESP, SpainUniversity of Bremen, DEU, 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: 201341
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