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Biostratigraphy and evolution of Miocene Discoaster spp. from IODP Site U1338 in the equatorial Pacific Ocean

Marina Ciummelli, Isabella Raffi and Jan Backman
Journal of Micropalaeontology, 36, 137-152, 7 December 2016, https://doi.org/10.1144/jmpaleo2015-034
Marina Ciummelli
1PetroStrat Ltd, Tan-y-Graig, Parc Caer Seion, Conwy LL32 8FA, UK
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  • For correspondence: marina.ciummelli@petrostrat.com
Isabella Raffi
2Dipartimento di Ingegneria e Geologia, Università ‘G. d'Annunzio’ di Chieti-Pescara, I-66013 Chieti Scalo, Italy
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Jan Backman
3Department of Geological Sciences, Stockholm University, SE-106 91 Stockholm, Sweden
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Abstract

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.

  • Miocene
  • Discoaster spp.
  • equatorial Pacific
  • five major morphogroups
  • abundance variations
  • © 2017 The Author(s)
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Journal of Micropalaeontology: 36 (2)
Journal of Micropalaeontology
Volume 36, Issue 2
August 2017
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Biostratigraphy and evolution of Miocene Discoaster spp. from IODP Site U1338 in the equatorial Pacific Ocean

Marina Ciummelli, Isabella Raffi and Jan Backman
Journal of Micropalaeontology, 36, 137-152, 7 December 2016, https://doi.org/10.1144/jmpaleo2015-034
Marina Ciummelli
1PetroStrat Ltd, Tan-y-Graig, Parc Caer Seion, Conwy LL32 8FA, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
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  • For correspondence: marina.ciummelli@petrostrat.com
Isabella Raffi
2Dipartimento di Ingegneria e Geologia, Università ‘G. d'Annunzio’ di Chieti-Pescara, I-66013 Chieti Scalo, Italy
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  • Find this author on PubMed
  • Search for this author on this site
Jan Backman
3Department of Geological Sciences, Stockholm University, SE-106 91 Stockholm, Sweden
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Biostratigraphy and evolution of Miocene Discoaster spp. from IODP Site U1338 in the equatorial Pacific Ocean

Marina Ciummelli, Isabella Raffi and Jan Backman
Journal of Micropalaeontology, 36, 137-152, 7 December 2016, https://doi.org/10.1144/jmpaleo2015-034
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    • Abstract
    • Material and methods
    • Taxonomy and abundance behaviour of five major groups of Miocene discoasters at IODP Site U1338
    • Major traits of Miocene discoasters at IODP Site U1338
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