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

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dc.contributor.author Ando, Atsushi en
dc.contributor.author Huber, Brian T. en
dc.contributor.author MacLeod, Kenneth G. en
dc.contributor.author Ohta, T. en
dc.contributor.author Khim, B. -K en
dc.date.accessioned 2009-06-08T14:25:55Z
dc.date.available 2009-06-08T14:25:55Z
dc.date.issued 2009
dc.identifier.citation Ando, Atsushi, Huber, Brian T., MacLeod, Kenneth G., Ohta, T., and Khim, B. -K. 2009. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F7520">Blake Nose stable isotopic evidence against the mid-Cenomanian glaciation hypothesis</a>." <em>Geology</em>. 37:451&ndash;454. en
dc.identifier.issn 0091-7613
dc.identifier.uri http://hdl.handle.net/10088/7520
dc.description.abstract Detailed multitaxon stable isotope ( A18O and A13C) 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 A13C 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 A18O and A13C offsets; comparative scanning electron microscope and Sr/Ca analyses allow some A18O data to be eliminated because of selective diagenesis. Across MCE Ia, the proposed interval of major glacioeustatic regression, the planktonic A18O values are constant for each taxon. The absence of a mean seawater A18O shift contradicts predictions for the mid-Cenomanian glaciation episode. The benthic A18O records show signifi cant fl uctuations during MCE I, implying short-term variability in North Atlantic intermediate-water and deep-water circulation patterns and/or sources at that time. en
dc.format.extent 234218 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.relation.ispartof Geology en
dc.title Blake Nose stable isotopic evidence against the mid-Cenomanian glaciation hypothesis en
dc.type Journal Article en
dc.identifier.srbnumber 77897
rft.jtitle Geology
rft.volume 37
rft.spage 451
rft.epage 454
dc.description.SIUnit NMNH en
dc.description.SIUnit NH-Paleobiology en
dc.citation.spage 451
dc.citation.epage 454


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