Impact of the Middle Miocene climate transition on elongate, cylindrical foraminifera in the subtropical Pacific

Johnson, K., Hayward, B. W. and Holbourn, A. (2011) Impact of the Middle Miocene climate transition on elongate, cylindrical foraminifera in the subtropical Pacific Marine Micropaleontology, 78 (1-2). pp. 50-64. DOI 10.1016/j.marmicro.2010.09.008.

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Fifty-eight species of elongate, cylindrical benthic foraminifera (here referred to as the Extinction Group) belonging to genera that became extinct during the mid-Pleistocene Climate Transition (MPT), were documented (similar to 50 kyr resolution) through the early middle Miocene (15-13 Ma) in two sites on opposite sides of the subtropical Pacific Ocean (ODP Sites 1146, South China Sea; ODP Site 1237, southeast Pacific). The study was undertaken to investigate the response of the Extinction Group (Ext. Gp) to the major cooling during the middle Miocene Climate Transition (MCT) to look for clues that might explain the causes of the extinction during the glacials of the mid-Pleistocene Climate Transition. Ext. Gp faunal differences between the two sites (attributed to regional and bathymetric differences in food supply to the seafloor) are greater than those that occurred through the 2 myr time span at either site. The middle Miocene Climate Transition was not an interval of enhanced species turnover or a decline in Ext. Gp abundance, in contrast to the major extinctions that occurred during the mid-Pleistocene Climate Transition. Distinct changes in the composition of the Ext. Gp faunas did occur through this time (more pronounced in Site 1237). At both sites the pre-middle Miocene Climate Transition faunas were transformed into their post-middle Miocene Climate Transition composition during the period of major cooling (14.0-13.7 Ma). During this transition interval the faunal composition swung back and forth between the two end member faunas. These faunal changes are attributed to changes in productivity (decrease in South China Sea, increase in southeast Pacific), brought about by major changes in global climate and continental aridity. (C) 2010 Elsevier B.V. All rights reserved.

Document Type: Article
Keywords: Deep-sea benthic foraminifera Middle Miocene cooling Extinction Subtropical Pacific south china sea atmospheric carbon-dioxide ice-sheet development benthic foraminifera equatorial pacific deep-water midpleistocene extinction pleistocene extinctions circulation changes north-atlantic
Research affiliation: Kiel University
Refereed: No
DOI etc.: 10.1016/j.marmicro.2010.09.008
ISSN: 0377-8398
Date Deposited: 15 Dec 2011 05:14
Last Modified: 08 Oct 2012 09:27

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