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Blake Nose stable isotopic evidence against the mid-Cenomanian glaciation hypothesis

Atsushi Ando, Brian T. Huber, Kenneth G. MacLeod, Tomoko Ohta and Boo-Keun Khim
Blake Nose stable isotopic evidence against the mid-Cenomanian glaciation hypothesis
Geology (Boulder) (May 2009) 37 (5): 451-454

Abstract

Detailed multitaxon stable isotope (delta (super 18) O and delta (super 13) C) data from Blake Nose (western North Atlantic) argue against a mid-Cenomanian glaciation event during the mid-Cretaceous greenhouse. Results generated are precisely correlated to sea-level changes inferred from European sequence stratigraphy using the twin delta (super 13) C excursions mid-Cenomanian event (MCE) Ia and MCE Ib. Microfossils analyzed (surface-dwelling to deep-dwelling planktonic foraminifera, benthic foraminifera, coccoliths) show remarkably consistent intertaxon delta (super 18) O and delta (super 13) C offsets; comparative scanning electron microscope and Sr/Ca analyses allow some delta (super 18) O data to be eliminated because of selective diagenesis. Across MCE Ia, the proposed interval of major glacioeustatic regression, the planktonic delta (super 18) O values are constant for each taxon. The absence of a mean seawater delta (super 18) O shift contradicts predictions for the mid-Cenomanian glaciation episode. The benthic delta (super 18) O records show significant fluctuations during MCE I, implying short-term variability in North Atlantic intermediate-water and deep-water circulation patterns and/or sources at that time.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 37
Serial Issue: 5
Title: Blake Nose stable isotopic evidence against the mid-Cenomanian glaciation hypothesis
Affiliation: Smithsonian National Museum of Natural History, Department of Paleobiology, Washington, DC, United States
Pages: 451-454
Published: 200905
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 32
Accession Number: 2009-050011
Categories: StratigraphyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2009111
Illustration Description: illus. incl. chart, strat. col.
N30°06'00" - N30°06'00", W76°14'06" - W76°14'06"
Secondary Affiliation: University of Missouri, USA, United StatesKyoto University, JPN, JapanPusan National University, KOR, South Korea
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: 200927
Program Name: ODPOcean Drilling Program
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