Osmium isotopic variations in metalliferous sediments from the East Pacific Rise and the Bauer Basin

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doi: 10.1016/0016-7037(93)90324-P
Authors:Ravizza, Greg; McMurtry, Gary M.
Author Affiliations:Primary:
Woods Hole Oceanographic Institution, Department of Geology and Geophysics, Woods Hole, MA, United States
University of Hawaii at Manoa, United States
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 57(17), p.4301-4310. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1993
Note:In English. 70 refs.; illus. incl. 2 tables, geol. sketch map
Summary:The range of 187Os/186Os ratios of metalliferous sediments from the Bauer Basin (E of the EPR) and the EPR (from 7.9 to 8.6) requires that > 90% of the Os is hydrogenous. The lack of mantle-derived Os isotopic signatures indicates that the Os system is not a sensitive tracer of seafloor hydrothermal processes. The dominant hydrogenous Os signature does not, however, preclude an important role played by ridge crest hydrothermal activity in controlling Os isotopic composition of sea-water. Os burial in association with metalliferous sediments is a significant sink in the marine Os cycle. Scavenging of Os onto hydrothermal Fe oxides may account for the enhanced Os burial. Cosmic Os may explain the depression of 187Os/186Os in Bauer Basin samples relative to EPR samples. [R.K.H.]
Subjects:Hydrothermal conditions; Isotope ratios; Isotopes; Marine sediments; Metals; Os-187/Os-186; Osmium; Platinum group; Radioactive isotopes; Sediments; Stable isotopes; East Pacific; East Pacific Rise; Pacific Ocean; Bauer Basin; Bauer Rise
Abstract Numbers:94M/2061
Record ID:1993041532
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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