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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100 1 |a Ravizza, G.  |e analytic author  |u Yale Univ., Dep. Geol. and Geophys., New Haven, CT 
245 1 4 |a The osmium isotopic composition of organic-rich marine sediments 
300 |a p. 1-6 
500 |a In English. 22 refs. 
500 |a Abstract number: 93M/788 
500 |a Abstractor: P.Br. 
500 |a Affiliation: Yale Univ., Dep. Geol. and Geophys.; New Haven, CT; USA; United States 
500 |a Key title: Earth and Planetary Science Letters 
500 |a Source note: Earth and Planetary Science Letters, 110(1-4), p.1-6. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X 
500 |a Publication type: journal article 
504 |b 22 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom 
520 |a The Os concentration and >187`Os/>186`Os 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 >187`Os/>186`Os ratios range from 8.2 to 8.9. The calculated fraction of hydrogenous Os exceeds 78% in all samples. Thus, the >187`Os/>186`Os ratio of these samples reflects Os isotopic composition of sea-water. The small range in measured >187`Os/>186`Os 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] 
650 7 |a Cenozoic  |2 georeft 
650 7 |a Geochemistry  |2 georeft 
650 7 |a Holocene  |2 georeft 
650 7 |a Isotopes  |2 georeft 
650 7 |a Marine environment  |2 georeft 
650 7 |a Marine sediments  |2 georeft 
650 7 |a Metals  |2 georeft 
650 7 |a Organic compounds  |2 georeft 
650 7 |a Os-187/Os-186  |2 georeft 
650 7 |a Osmium  |2 georeft 
650 7 |a Platinum group  |2 georeft 
650 7 |a Quaternary  |2 georeft 
650 7 |a Radioactive isotopes  |2 georeft 
650 7 |a Sea water  |2 georeft 
650 7 |a Sediments  |2 georeft 
650 7 |a Stable isotopes  |2 georeft 
653 |a Organic materials 
700 1 |a Turekian, K. K.,  |e analytic author 
773 0 |t Earth and Planetary Science Letters  |d Amsterdam : Elsevier, May 1992  |x 0012-821X  |y EPSLA2  |n Earth and Planetary Science Letters, 110(1-4), p.1-6. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X Publication type: journal article  |g Vol. 110, no. 1-4  |h 2 tables 
856 |u urn:doi: 10.1016/0012-821X(92)90034-S