The osmium isotopic composition of organic-rich marine sediments

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doi: 10.1016/0012-821X(92)90034-S
Authors:Ravizza, G.; Turekian, K. K.
Author Affiliations:Primary:
Yale Univ., Dep. Geol. and Geophys., New Haven, CT, United States
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 110(1-4), p.1-6. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:1992
Note:In English. 22 refs.; 2 tables
Summary:The Os concentration and 187Os/186Os ratios of several recent, marine, organic-rich sediment samples from three widely separated sites were measured. Os concentrations range from 0.095 to 0.212 ppb and 187Os/186Os ratios range from 8.2 to 8.9. The calculated fraction of hydrogenous Os exceeds 78% in all samples. Thus, the 187Os/186Os ratio of these samples reflects Os isotopic composition of sea-water. The small range in measured 187Os/186Os ratio indicates that the Os isotopic composition at these sites is fairly homogeneous. The large magnitude of the Os burial flux at these sites indicates that the Os burial in association with organic-rich sediments is an important sink in the marine cycle of Os. These data also suggest that ancient organic-rich sediments may provide a record of past variations in the Os isotopic composition of sea-water. [Authors' abstract] [P.Br.]
Subjects:Cenozoic; Geochemistry; Holocene; Isotopes; Marine environment; Marine sediments; Metals; Organic compounds; Os-187/Os-186; Osmium; Platinum group; Quaternary; Radioactive isotopes; Sea water; Sediments; Stable isotopes; Organic materials
Abstract Numbers:93M/788
Record ID:1992036656
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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