The glacial-interglacial variation of seawater osmium isotopes as recorded in Santa Barbara Basin

Gwyneth Gordon; K. K. Turekian

doi:10.1016/j.epsl.2004.10.004

The glacial-interglacial variation of seawater osmium isotopes as recorded in Santa Barbara Basin

Gwyneth Gordon, K. K. Turekian

Earth and Space Exploration, School of (SESE)

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

The Pleistocene deposits of Santa Barbara Basin (SBB) show laminations during interglacial periods typical of an anoxic or suboxic depositional environment and more sporadically laminated deposits during glacial times, indicating a more oxic environment of deposition. The ¹⁸⁷Os/¹⁸⁸Os value of sediment leaches varies as a function of climate, consistent with a more radiogenic Os signal during interglacial times and less radiogenic Os values more typical of glacial times. The signal is confounded by contributions from a high Os detrital component with a variable ¹⁸⁷Os/¹⁸⁸Os value, but generally agrees with prior result from deposits from other marine environments.

Original language	English (US)
Pages (from-to)	379-389
Number of pages	11
Journal	Earth and Planetary Science Letters
Volume	228
Issue number	3-4
DOIs	https://doi.org/10.1016/j.epsl.2004.10.004
State	Published - Dec 15 2004

Keywords

Glacial-interglacial climate change
Os/Os
Paleoclimate
Santa Barbara Basin
Varved sediment

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science

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10.1016/j.epsl.2004.10.004

Cite this

@article{8578831fcde5442f936160f84e99cc78,

title = "The glacial-interglacial variation of seawater osmium isotopes as recorded in Santa Barbara Basin",

abstract = "The Pleistocene deposits of Santa Barbara Basin (SBB) show laminations during interglacial periods typical of an anoxic or suboxic depositional environment and more sporadically laminated deposits during glacial times, indicating a more oxic environment of deposition. The 187Os/188Os value of sediment leaches varies as a function of climate, consistent with a more radiogenic Os signal during interglacial times and less radiogenic Os values more typical of glacial times. The signal is confounded by contributions from a high Os detrital component with a variable 187Os/188Os value, but generally agrees with prior result from deposits from other marine environments.",

keywords = "Glacial-interglacial climate change, Os/Os, Paleoclimate, Santa Barbara Basin, Varved sediment",

author = "Gwyneth Gordon and Turekian, {K. K.}",

note = "Funding Information: This work was supported in part by NSF grant EAR-9216778. Samples were provided by the Ocean Drilling Project. Discussions with R. Oxburgh and F. Marcantonio provided valuable insights. Os measurements were performed at the Woods Hole Oceanographic Institution and the authors are grateful to G. Ravizza, B. Peucker-Ehrenbrink and S. Hart for use of their facilities. J. Emerson provided assistance with statistics. Rachel Cave and an anonymous reviewer gave valuable suggestions for materially improving this paper.",

year = "2004",

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doi = "10.1016/j.epsl.2004.10.004",

language = "English (US)",

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pages = "379--389",

journal = "Earth and Planetary Science Letters",

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T1 - The glacial-interglacial variation of seawater osmium isotopes as recorded in Santa Barbara Basin

AU - Gordon, Gwyneth

AU - Turekian, K. K.

N1 - Funding Information: This work was supported in part by NSF grant EAR-9216778. Samples were provided by the Ocean Drilling Project. Discussions with R. Oxburgh and F. Marcantonio provided valuable insights. Os measurements were performed at the Woods Hole Oceanographic Institution and the authors are grateful to G. Ravizza, B. Peucker-Ehrenbrink and S. Hart for use of their facilities. J. Emerson provided assistance with statistics. Rachel Cave and an anonymous reviewer gave valuable suggestions for materially improving this paper.

PY - 2004/12/15

Y1 - 2004/12/15

N2 - The Pleistocene deposits of Santa Barbara Basin (SBB) show laminations during interglacial periods typical of an anoxic or suboxic depositional environment and more sporadically laminated deposits during glacial times, indicating a more oxic environment of deposition. The 187Os/188Os value of sediment leaches varies as a function of climate, consistent with a more radiogenic Os signal during interglacial times and less radiogenic Os values more typical of glacial times. The signal is confounded by contributions from a high Os detrital component with a variable 187Os/188Os value, but generally agrees with prior result from deposits from other marine environments.

AB - The Pleistocene deposits of Santa Barbara Basin (SBB) show laminations during interglacial periods typical of an anoxic or suboxic depositional environment and more sporadically laminated deposits during glacial times, indicating a more oxic environment of deposition. The 187Os/188Os value of sediment leaches varies as a function of climate, consistent with a more radiogenic Os signal during interglacial times and less radiogenic Os values more typical of glacial times. The signal is confounded by contributions from a high Os detrital component with a variable 187Os/188Os value, but generally agrees with prior result from deposits from other marine environments.

KW - Glacial-interglacial climate change

KW - Os/Os

KW - Paleoclimate

KW - Santa Barbara Basin

KW - Varved sediment

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JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

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ER -

The glacial-interglacial variation of seawater osmium isotopes as recorded in Santa Barbara Basin

Abstract

Keywords

ASJC Scopus subject areas

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Osmium concentrations and isotope ratios of ODP Site 146-893A

Cite this

The glacial-interglacial variation of seawater osmium isotopes as recorded in Santa Barbara Basin

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Datasets

Osmium concentrations and isotope ratios of ODP Site 146-893A

Cite this