Rhenium and osmium abundances in chondritic meteorites

Physics

Scientific paper

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Scientific paper

The abundances of Re and Os in thirty-two chondrites representing all classes have been determined by neutron activation analysis. Some disagreement with previous determinations of Os in ordinary chondrites can be explained by the difficulties of sampling for siderophilic elements when metallic nickel-iron is present. Considerable fractionation of Re and Os between chondrite classes is apparent, and cannot be interpreted solely on the basis of transfer of metallic phase rich in these two elements. Solar atomic abundances relative to 10 6 atoms Si calculated from the mean of all chondrites analysed are 0.053 atoms Re and 0.61 atoms Os.

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