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Alkenone producers during late Oligocene-early Miocene revisited
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
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2012 (English)In: Paleoceanography, ISSN 0883-8305, Vol. 27, PA1202- p.Article in journal (Refereed) Published
Abstract [en]

This study investigates ancient alkenone producers among the late Oligocene–early Miocene coccolithophores recorded at Deep Sea Drilling Project (DSDP) Site 516. Contrary to common assumptions, Reticulofenestra was not the most important alkenone producer throughout the studied time interval. The comparison between coccolith species-specific absolute abundances and alkenone contents in the same sedimentary samples shows thatCyclicargolithus abundances explain 40% of the total variance of alkenone concentration and that the speciesCyclicargolithus floridanus was a major alkenone producer, although other related taxa may have also contributed to the alkenone production at DSDP Site 516. The distribution of the different alkenone isomers (MeC37:2, EtC38:2, and MeC38:2) remained unchanged across distinct changes in species composition, suggesting similar diunsaturated alkenone compositions within the Noelaerhabdaceae family during the late Oligocene–early Miocene. However, the overall larger cell size of Cyclicargolithus may have implications for the alkenone-based reconstruction of past partial pressure of CO2. Our results underscore the importance of a careful evaluation of the most likely alkenone producers for periods (>1.85 Ma) predating the first occurrence of contemporary alkenone producers (i.e., Emiliania huxleyi andGephyrocapsa oceanica).

Place, publisher, year, edition, pages
2012. Vol. 27, PA1202- p.
National Category
Natural Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
URN: urn:nbn:se:uu:diva-165414DOI: 10.1029/2011PA002164ISI: 000299384700001OAI: oai:DiVA.org:uu-165414DiVA: diva2:473406
Available from: 2012-01-05 Created: 2012-01-05 Last updated: 2012-02-14Bibliographically approved

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Henderiks, Jorijntje
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