Re-Os ages of group IIA, IIIA, IVA, and IVB iron meteorites

Science

Volumn 271, Issue 5252, 1996, Pages 1099-1102

  Smoliar, Michael I ^a   Walker, Richard J ^a   Morgan, John W ^b  

^a Bldg 142   (United States)

^b Department of Environmental and Radiological Health Sciences   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

AGE DETERMINATION; IRON METEORITE; ISOTOPIC RATIO; OSMIUM; RHENIUM;

EID: 0029730872     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.271.5252.1099     Document Type: Article

References (35)

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20. 188Os ratios to be generally better than ±0.05 and ±0.3%, respectively. Total analytical blanks for this study, including loading and filament blanks, averaged 40 pg for Re and 3 pg for Os. These blank amounts are well below the >50 ng of Re and >370 ng of Os processed for each sample and should not significantly increase the errors in our measurements.
21. -1.
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25. Os, the following parental melt concentrations (in parts per billion) are obtained for Re and Os, correspondingly: 220, 2380 (IIA); 380, 4140 (IIIA); 210, 2200 (IVA), 2440, 34300 (IVB).
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35. We thank R S.Clarke, M. Ivanova, and J. T. Wasson for meteorite samples. Comments by R. W Carlson and two anonymous reviewers helped to improve this manuscript. Supported by National Aeronautics and Space Administration grant NAGW 3625 and by Geological Society of America Student Research grant 5710-95.