Cenomanian-Turonian palaeoceanographic change on the Kerguelen Plateau: a comparison with Northern Hemisphere records

Holbourn, A. and Kuhnt, W. (2002) Cenomanian-Turonian palaeoceanographic change on the Kerguelen Plateau: a comparison with Northern Hemisphere records Cretaceous Research, 23 (3). pp. 333-349. DOI 10.1006/cres.2002.1008.

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Recent drilling on the Kerguelen Plateau (Ocean Drilling Program Leg 183) has provided a unique and exciting high latitude record of palaeoceanographic change during the Cenomanian-Turonian in the Southern Ocean. The benthic foraminiferal succession at Site 1138 records the evolution of the Kerguelen Plateau from a subaerially exposed platform in the Cenomanian to a bathyal, pelagic environment in the early Turonian, following a major transgressive pulse and increased thermal subsidence of the Kerguelen Plateau, which led to a sea-level rise of possibly several hundred metres. Diversified benthic foraminiferal assemblages indicate an upper bathyal, mesotrophic setting after the peak of the transgression. The assemblages exhibit strong similarities to temperate, shelf and slope assemblages in the Northern Hemisphere. This bimodal distribution reflects the existence of open oceanic gateways and a dynamic trans-hemispheric global circulation. Equatorial assemblages are characterized by a low-diversity, high carbon flux biofacies. Assemblages from Alaska demonstrate high organic productivity and low oxygen conditions and the prevalence of elevated temperatures on the flooded shelf of the North Slope. Our results show that the distribution of upper bathyal benthic foraminifera was strongly modulated by carbon flux and oxygenation fluctuations, and not by physical migration barriers. (C) 2002 Elsevier Science Ltd. All rights reserved.

Document Type: Article
Keywords: Ocean Drilling Program Leg 183 Kerguelen Plateau benthic foraminifera biogeography palaeoceanography Cenomanian-Turonian benthic foraminiferal assemblages sea-level change paleoclimatic significance paleobotanical evidence alexander island polar climates arctic-ocean carbon flux biodiversity boundary
Research affiliation: Kiel University
DOI etc.: 10.1006/cres.2002.1008
ISSN: 0195-6671
Date Deposited: 02 Feb 2012 07:03
Last Modified: 08 Oct 2012 10:36
URI: http://eprints.uni-kiel.de/id/eprint/16243

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