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Middle Eocene equatorial Pacific paleoceanography: insights from bulk sediment geochemistry, ODP Site 1218 (abstract of poster presented at AGU Fall Meeting, San Francisco, 6-10 Dec 2002)

Middle Eocene equatorial Pacific paleoceanography: insights from bulk sediment geochemistry, ODP Site 1218 (abstract of poster presented at AGU Fall Meeting, San Francisco, 6-10 Dec 2002)
Middle Eocene equatorial Pacific paleoceanography: insights from bulk sediment geochemistry, ODP Site 1218 (abstract of poster presented at AGU Fall Meeting, San Francisco, 6-10 Dec 2002)
The deep equatorial Pacific was dominated by siliceous sedimentation from ~45 Ma to the Eocene-Oligocene boundary. Inspection of Paleogene sediments recovered during Ocean Drilling Program (ODP) Leg 199 and Deep Sea Drilling Program Leg 16 indicate several episodes of carbonate deposition during the Middle Eocene. The well-preserved and expanded sedimentary sequence recovered at ODP Site 1218 presents an opportunity to document the Middle Eocene paleoceanographic history of the equatorial Pacific, and to determine whether the occurrence of Middle Eocene carbonates in Chron C18 is coincident with a sequence of rapid paleoceanographic and climatic changes. Here we present high-resolution bulk sediment oxygen and carbon isotope records, carbonate, opal, and organic carbon accumulation data, and coarse sand fraction data for chalks and radiolarites spanning Chron C18 from ODP Site 1218. Stable isotope and \% carbonate records exhibit large-amplitude oscillations corresponding to obliquity and eccentricity frequencies. In addition, a series of stepwise oxygen isotope excursions of 0.5 to 0.8 per mil at roughly 40.5, 40.4, and 40.3 Ma, occur in coincidence with large-scale drops in \% carbonate. These data may record rapid CCD fluctuation associated with transient warming and cooling events and/or ephemeral polar ice sheets.
0096-3941
p.F949
Tripati, A.K.
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Lyle, M.D.
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Backman, J.
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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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Tripati, A.K.
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Lyle, M.D.
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Backman, J.
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Wilson, P.A.
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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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Knoop, P.
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Kruse, S.
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Lanci, L.
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Lear, C.H.
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Nishi, H.
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Nomura, R.
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Rea, D.K.
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Steiger, T.H.
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Vanden Berg, M.D.
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Wade, B.S.
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Tripati, A.K., Lyle, M.D., Backman, J., 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., Raffi, I., Rea, B.R., Rea, D.K., Steiger, T.H., Vanden Berg, M.D. and Wade, B.S. (2002) Middle Eocene equatorial Pacific paleoceanography: insights from bulk sediment geochemistry, ODP Site 1218 (abstract of poster 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

The deep equatorial Pacific was dominated by siliceous sedimentation from ~45 Ma to the Eocene-Oligocene boundary. Inspection of Paleogene sediments recovered during Ocean Drilling Program (ODP) Leg 199 and Deep Sea Drilling Program Leg 16 indicate several episodes of carbonate deposition during the Middle Eocene. The well-preserved and expanded sedimentary sequence recovered at ODP Site 1218 presents an opportunity to document the Middle Eocene paleoceanographic history of the equatorial Pacific, and to determine whether the occurrence of Middle Eocene carbonates in Chron C18 is coincident with a sequence of rapid paleoceanographic and climatic changes. Here we present high-resolution bulk sediment oxygen and carbon isotope records, carbonate, opal, and organic carbon accumulation data, and coarse sand fraction data for chalks and radiolarites spanning Chron C18 from ODP Site 1218. Stable isotope and \% carbonate records exhibit large-amplitude oscillations corresponding to obliquity and eccentricity frequencies. In addition, a series of stepwise oxygen isotope excursions of 0.5 to 0.8 per mil at roughly 40.5, 40.4, and 40.3 Ma, occur in coincidence with large-scale drops in \% carbonate. These data may record rapid CCD fluctuation associated with transient warming and cooling events and/or ephemeral polar ice sheets.

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Published date: 2002

Identifiers

Local EPrints ID: 41889
URI: http://eprints.soton.ac.uk/id/eprint/41889
ISSN: 0096-3941
PURE UUID: bedd29d2-956e-4810-84a1-37b65d13e6ad

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Date deposited: 17 Oct 2006
Last modified: 19 Nov 2021 20:04

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Contributors

Author: A.K. Tripati
Author: M.D. Lyle
Author: J. Backman
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: I. Raffi
Author: B.R. Rea
Author: D.K. Rea
Author: T.H. Steiger
Author: M.D. Vanden Berg
Author: B.S. Wade

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