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The response of calcareous nannofossil assemblages to the Paleocene/Eocene Thermal Maximum at the Walvis Ridge in the South Atlantic
Universita' "G. d'Annunzio".
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
(University of California, Santa Cruz)
Utrecht University.
2009 (English)In: Marine Micropaleontology, ISSN 0377-8398, Vol. 70, no 3-4, 201-212 p.Article in journal (Refereed) Published
Abstract [en]

Compositions and abundances of calcareous nannofossil taxa have been determined in a ca 170 kyrs long time interval across the Paleocene/Eocene boundary at 1-cm to 10-cm resolution from two ODP Sites (1262, 1263) drilled along the flank of the Walvis Ridge in the South Atlantic. The results are compared to published data from ODP Site 690 in the Weddell Sea. The assemblages underwent rapid evolution over a 74 kyrs period, indicating stressed, unstable and/or extreme photic zone environments during the PETM hyperthermal. This rapid evolution, which created 5 distinct stratigraphic horizons, is consistent with the restricted brief occurrences of malformed and/or weakly calcified morphotypes. The production of these aberrant morphotypes is possibly caused by major global scale changes in carbon cycling in the ocean–atmosphere system, affecting also photic zone environments. No marked paleoecologically induced changes are observed in abundances of the genera Discoaster, Fasciculithus and Sphenolithus at the Walvis Ridge sites. Surprisingly, there is no significant correlation in abundance between these three genera, presumed to have had a similar paleoecological preference for warm and oligotrophic conditions.

Place, publisher, year, edition, pages
Elsevier , 2009. Vol. 70, no 3-4, 201-212 p.
Keyword [en]
Calcareous nannofossils; PETM; Uniquely rapid evolution; Paleoecology; Photic zone environment
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Research subject
Marine Geoscience
URN: urn:nbn:se:su:diva-34384DOI: 10.1016/j.marmicro.2008.12.005ISI: 000263942800008OAI: diva2:284639
Available from: 2010-01-08 Created: 2010-01-08 Last updated: 2012-01-25Bibliographically approved

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Backman, Jan
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