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Calcareous nannoplankton response to late Albian oceanic anoxic event 1d in the western North Atlantic

Record type: Article

Well-preserved nannofossil and stable isotope records from the mid-Cretaceous of Ocean Drilling Project Leg 171B (western North Atlantic) indicate cyclical, productivity-based variations in surface water characteristics, suggesting orbitally paced changes in upwelling intensity and the strength of deep mixing associated with oceanic anoxic event (OAE)1d. Paleontologic and isotopic evidence suggest that collapse of upper water column stratification associated with OAE1d was preceded by approximately 1 m.y. of progressively decreasing water column stability and increasing surface water fertility. Thirteen species went extinct during a short (ca. 200 k.y.) interval associated with OAE1d. Nine of these have morphological characters suggesting adaptation to specific depths in the photic zone. Simultaneous extinction of these depth-zoned species suggests that stratification collapse disrupted the habitat space for these specialized forms, resulting in extinction. A cyclostratigraphic model provides age estimates of several important nannofossil datums including the first appearances of Eiffellithus turriseiffelii (100.95 Ma) and Corollithion kennedyi (99.55 Ma).

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Citation

Watkins, David K., Cooper, Matthew J. and Wilson, Paul A. (2005) Calcareous nannoplankton response to late Albian oceanic anoxic event 1d in the western North Atlantic Paleoceanography, 20, (2), pp. 1-14. (doi:10.1029/2004PA001097).

More information

Published date: 2005
Keywords: nannofossils, oceanic anoxic event, extinction

Identifiers

Local EPrints ID: 38422
URI: http://eprints.soton.ac.uk/id/eprint/38422
ISSN: 0883-8305
PURE UUID: aac1edc5-c724-4ce9-a239-05966cb7a928
ORCID for Matthew J. Cooper: ORCID iD orcid.org/0000-0002-2130-2759

Catalogue record

Date deposited: 08 Jun 2006
Last modified: 17 Jul 2017 15:39

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Contributors

Author: David K. Watkins
Author: Paul A. Wilson

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