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Biostratigraphy and evolution of Miocene Discoaster spp. from IODP Site U1338 in the equatorial Pacific Ocean
Stockholm University, Faculty of Science, Department of Geological Sciences.
Number of Authors: 32017 (English)In: Journal of Micropalaeontology, ISSN 0262-821X, E-ISSN 2041-4978, Vol. 36, p. 137-152Article in journal (Refereed) Published
Abstract [en]

Assemblages of upper lower through upper Miocene Discoaster spp. have been quantified from Integrated Ocean Drilling Program (IODP) Site U1338 in the eastern equatorial Pacific Ocean. These assemblages can be grouped into five broad morphological categories: six-rayed with bifurcated ray tips, six-rayed with large central areas, six-rayed with pointed ray tips, five-rayed with bifurcated ray tips and five-rayed with pointed ray tips. Discoaster deflandrei dominates the assemblages prior to 15.8 Ma. The decline in abundance of D. deflandrei close to the early-middle Miocene boundary occurs together with the evolution of the D. variabilis group, including D. signus and D. exilis. Six-rayed discoasters having large central areas become a prominent member of the assemblages for a 400 ka interval in the late middle Miocene. Five-and six-rayed forms having pointed tips become prominent in the early late Miocene and show a strong antiphasing relationship with the D. variabilis group. Discoaster bellus completely dominates the Discoaster assemblages for a 400 ka interval in the middle late Miocene. Abundances of all discoasters, or discoasters at the species level, show only (surprisingly) weak correlations to carbonate contents or oxygen and carbon isotopes of bulk sediment when calculated over the entire sample interval.

Place, publisher, year, edition, pages
2017. Vol. 36, p. 137-152
Keywords [en]
Miocene, Discoaster spp., equatorial Pacific, five major morphogroups, abundance variations
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-147954DOI: 10.1144/jmpaleo2015-034ISI: 000409471200001OAI: oai:DiVA.org:su-147954DiVA, id: diva2:1149793
Available from: 2017-10-17 Created: 2017-10-17 Last updated: 2017-10-17Bibliographically approved

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