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Paleogene and Neogene Paleoclimate Implications of High-Resolution Mineralogy and Mass Accumulation Rates for Equatorial Pacific Sites Drilled During ODP Leg 199 (abstract of poster presented at AGU Fall Meeting, San Francisco, 6-10 Dec 2002)

Paleogene and Neogene Paleoclimate Implications of High-Resolution Mineralogy and Mass Accumulation Rates for Equatorial Pacific Sites Drilled During ODP Leg 199 (abstract of poster presented at AGU Fall Meeting, San Francisco, 6-10 Dec 2002)
Paleogene and Neogene Paleoclimate Implications of High-Resolution Mineralogy and Mass Accumulation Rates for Equatorial Pacific Sites Drilled During ODP Leg 199 (abstract of poster presented at AGU Fall Meeting, San Francisco, 6-10 Dec 2002)
ODP Leg 199 was the first leg in which reflectance spectra were routinely measured from sediment cores at an extended bandwidth (350-2500 nm) using light absorption spectroscopy (LAS). Precruise calibration of spectral features to local ground-truth samples enabled shipboard calculation of concentrations of calcite and opal, the two biogenic sediment components, and smectite and illite, the two main terrigenous sediment components. These mineral calculation transforms were refined postcruise with additional ground-truth samples. Using multiple regression and LAS mineralogy, the multi-sensor track physical properties data were converted into high-resolution mineralogy logs. These logs, as well as age and dry-bulk density, were used to calculate high-resolution carbonate, opal, and terrigenous mass accumulation rates (MAR) for each Leg 199 site. Plots of opal MAR versus paleolatitude show that during the Paleogene, the opal equatorial accumulation bulge extended to about 12 degrees N, whereas in the Neogene the bulge extended only to about 7 degrees N. Carbonate accumulation rates during the middle to late Eocene were very low except for a few isolated intervals (e.g., around 41 Ma). Carbonate accumulation rates in the Oligocene and early Miocene were much higher than in the Eocene, with the carbonate equatorial bulge extending to 4 degrees N. Terrigenous MAR are much more variable between adjacent sites, probably because of ocean bottom currents. A Pliocene increase in terrigenous accumulations in the north (20-25 degrees N) may correspond to an increase in the Asian dust flux that occurred ~2.6 Ma.
0096-3941
p.F949
Vanden Berg, M.A.
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Jarrard, R.D.
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Lyle, M.
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Wilson, P.A.
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Faul, K.
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Gaillot, P.
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Hovan, S.A.
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Gaillot, P.
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Steiger, T.H.
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Tripati, A.K.
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Vanden Berg, M.A., Jarrard, R.D., Lyle, M., Wilson, P.A., Janecek, T.R., Backman, J., 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.D., Norris, R.D., Pälike, H., Parés, J.M., Quintin, L., Raffi, I., Rea, B.R., Rea, D.K., Steiger, T.H., Tripati, A.K. and Wade, B.S. (2002) Paleogene and Neogene Paleoclimate Implications of High-Resolution Mineralogy and Mass Accumulation Rates for Equatorial Pacific Sites Drilled During ODP Leg 199 (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

ODP Leg 199 was the first leg in which reflectance spectra were routinely measured from sediment cores at an extended bandwidth (350-2500 nm) using light absorption spectroscopy (LAS). Precruise calibration of spectral features to local ground-truth samples enabled shipboard calculation of concentrations of calcite and opal, the two biogenic sediment components, and smectite and illite, the two main terrigenous sediment components. These mineral calculation transforms were refined postcruise with additional ground-truth samples. Using multiple regression and LAS mineralogy, the multi-sensor track physical properties data were converted into high-resolution mineralogy logs. These logs, as well as age and dry-bulk density, were used to calculate high-resolution carbonate, opal, and terrigenous mass accumulation rates (MAR) for each Leg 199 site. Plots of opal MAR versus paleolatitude show that during the Paleogene, the opal equatorial accumulation bulge extended to about 12 degrees N, whereas in the Neogene the bulge extended only to about 7 degrees N. Carbonate accumulation rates during the middle to late Eocene were very low except for a few isolated intervals (e.g., around 41 Ma). Carbonate accumulation rates in the Oligocene and early Miocene were much higher than in the Eocene, with the carbonate equatorial bulge extending to 4 degrees N. Terrigenous MAR are much more variable between adjacent sites, probably because of ocean bottom currents. A Pliocene increase in terrigenous accumulations in the north (20-25 degrees N) may correspond to an increase in the Asian dust flux that occurred ~2.6 Ma.

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Published date: 2002

Identifiers

Local EPrints ID: 41885
URI: http://eprints.soton.ac.uk/id/eprint/41885
ISSN: 0096-3941
PURE UUID: 2361f60d-0ff0-4c76-bbf6-10385d9a5f44

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

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Contributors

Author: M.A. Vanden Berg
Author: R.D. Jarrard
Author: M. Lyle
Author: P.A. Wilson
Author: T.R. Janecek
Author: J. Backman
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.D. 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: A.K. Tripati
Author: B.S. Wade

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