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Calcareous nannofossils at the Paleocene/Eocene transition in the equatorial Pacific Ocean (ODP Leg 199) (abstract of paper presented at AGU Fall Meeting, San Francisco, 6-10 Dec 2002)

Calcareous nannofossils at the Paleocene/Eocene transition in the equatorial Pacific Ocean (ODP Leg 199) (abstract of paper presented at AGU Fall Meeting, San Francisco, 6-10 Dec 2002)
Calcareous nannofossils at the Paleocene/Eocene transition in the equatorial Pacific Ocean (ODP Leg 199) (abstract of paper presented at AGU Fall Meeting, San Francisco, 6-10 Dec 2002)
Calcareous nannofossil assemblages from the first Paleocene/Eocene sections ever to be sampled in the central tropical Pacific (ODP Sites 1215, 1220 and 1221) were preliminary studied with the purpose of obtaining informations on the evolutionary turnovers associated with the P/E boundary time and the peculiar global climatic conditions. We have documented the distribution ranges of some taxa, as {\it Ericsonia, Discoaster, Fasciculithus, Rhomboaster} and {\it Tribrachiatus}. Data were obtained through quantitative analyses on the assemblages. These detailed analyses were mainly focused on the evolution of {\it Rhomboaster- Tribrachiatus} lineage in the lower Eocene interval, and on the stratigraphic relationship of these taxa with the genus {\it Fasciculithus}. We have documented the consistent occurrence of {\it Thoracosphaera} cysts at the P/E boundary interval. Thoracosphaerids are considered representatives of opportunistic flora, and blooms of these forms are observed in sediments immediately above the extinction horizon of the Cretaceous/Paleogene boundary. Their abundance at the P/E transition could document a change of critical boundary conditions in surface waters. The analyses on calcareous nannofossils from the Early Paleogene sediments recovered during ODP Leg 199 provide also a new set of data for the nannofossil biostratigraphy and biochronology at the P/E transition interval.
0096-3941
p.F949
Raffi, I.
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Backman, J.
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Lyle, M.
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Janecek, T.R.
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Busch, W.H.
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Coxall, H.K.
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Faul, K.
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Gaillot, P.
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Hovan, S.A.
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Kruse, S.
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Lanci, L.
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Raffi, I.
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Faul, K.
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Gaillot, P.
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Hovan, S.A.
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Knoop, P.
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Lanci, L.
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Lear, C.H.
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Moore, T.C.
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Nigrini, C.A.
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Nishi, H.
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Nomura, R.
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Norris, R.D.
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Steiger, T.H.
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Tripati, A.K.
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Vanden Berg, M.D.
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Wade, B.S.
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Raffi, I., Backman, J., Lyle, M., Wilson, P.A., Janecek, T.R., Busch, W.H., Coxall, H.K., Faul, K., Gaillot, P., Hovan, S.A., Knoop, P., Kruse, S., Lanci, L., Lear, C.H., Moore, T.C., Nigrini, C.A., Nishi, H., Nomura, R., Norris, R.D., Pälike, H., Parés, J.M., Quintin, L., Rea, B.R., Rea, D.K., Steiger, T.H., Tripati, A.K., Vanden Berg, M.D. and Wade, B.S. (2002) Calcareous nannofossils at the Paleocene/Eocene transition in the equatorial Pacific Ocean (ODP Leg 199) (abstract of paper presented at AGU Fall Meeting, San Francisco, 6-10 Dec 2002). EOS: Transactions American Geophysical Union, 83 (47, Supplement), p.F949.

Record type: Article

Abstract

Calcareous nannofossil assemblages from the first Paleocene/Eocene sections ever to be sampled in the central tropical Pacific (ODP Sites 1215, 1220 and 1221) were preliminary studied with the purpose of obtaining informations on the evolutionary turnovers associated with the P/E boundary time and the peculiar global climatic conditions. We have documented the distribution ranges of some taxa, as {\it Ericsonia, Discoaster, Fasciculithus, Rhomboaster} and {\it Tribrachiatus}. Data were obtained through quantitative analyses on the assemblages. These detailed analyses were mainly focused on the evolution of {\it Rhomboaster- Tribrachiatus} lineage in the lower Eocene interval, and on the stratigraphic relationship of these taxa with the genus {\it Fasciculithus}. We have documented the consistent occurrence of {\it Thoracosphaera} cysts at the P/E boundary interval. Thoracosphaerids are considered representatives of opportunistic flora, and blooms of these forms are observed in sediments immediately above the extinction horizon of the Cretaceous/Paleogene boundary. Their abundance at the P/E transition could document a change of critical boundary conditions in surface waters. The analyses on calcareous nannofossils from the Early Paleogene sediments recovered during ODP Leg 199 provide also a new set of data for the nannofossil biostratigraphy and biochronology at the P/E transition interval.

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Published date: 2002

Identifiers

Local EPrints ID: 41887
URI: http://eprints.soton.ac.uk/id/eprint/41887
ISSN: 0096-3941
PURE UUID: f2d4c837-91f7-46e0-bfb0-8a6e8bb6f11e

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Date deposited: 17 Oct 2006
Last modified: 19 Nov 2021 20:03

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Contributors

Author: I. Raffi
Author: J. Backman
Author: M. Lyle
Author: P.A. Wilson
Author: T.R. Janecek
Author: W.H. Busch
Author: H.K. Coxall
Author: K. Faul
Author: P. Gaillot
Author: S.A. Hovan
Author: P. Knoop
Author: S. Kruse
Author: L. Lanci
Author: C.H. Lear
Author: T.C. Moore
Author: C.A. Nigrini
Author: H. Nishi
Author: R. Nomura
Author: R.D. Norris
Author: H. Pälike
Author: J.M. Parés
Author: L. Quintin
Author: B.R. Rea
Author: D.K. Rea
Author: T.H. Steiger
Author: A.K. Tripati
Author: M.D. Vanden Berg
Author: B.S. Wade

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