Computer Science
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.110....1r&link_type=abstract
Earth and Planetary Science Letters, Volume 110, Issue 1-4, p. 1-6.
Computer Science
34
Scientific paper
The osmium (Os) concentration and 187Os/186Os ratio of several recent, marine, organic-rich sediment samples from three widely separated sites have been 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 seawater. 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 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 seawater.
Ravizza Greg
Turekian Karl K.
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