Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..514o&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 514-515
Other
Antarctic Regions, Chondrites, Meteoritic Composition, Rhenium, Abundance, Chemical Properties, Weathering
Scientific paper
In chondritic meteorites, siderophile elements are mostly included in the Fe-Ni alloy. Some of the refractory siderophiles (for instance, Re, Os, and Ir) were observed to exist as refractory metal nuggets. Thus, refractory siderophiles could be fractionated from the other siderophile elements in meteorites. Such a fractionation may have occurred during condensation and/or accretion processes. Although refractory siderophiles are thought to be scarcely fractionated from each other because of the similarity of their cosmochemical properties, the fluctuation of their abundance ratios among meteorite classes have been recognized. The fractionation of these elements in ordinary chondrites (OC) has been discussed mainly based on the data of equilibrated ordinary chondrites (EOC) because of the scarcity of the data for unequilibrated ordinary chondrites (UOC). Considering that UOC are more primitive than EOC in OC, we may use the data of UOC rather than those of EOC. As siderophile elements are mostly localized in the metal phase, their absolute contents are accordingly highly dependent on the metal content. Simultaneous determination of these elements is highly desirable for discussion about their relative abundances. In this study, siderophile elements in Antarctic UOC were simultaneously determined by radiochemical neutron activation analysis (RNAA) in order to discuss the fractionation of these elements. Rhenium was confirmed to be largely fractionated among refractory siderophile elements (Re, Os, and Ir) in Antarctic UOC. While Antarctic UOC preserve the C1 chondritic ratio of Ir/Os, the Re/Os ratios in Antarctic UOC seem to be different from that of C1 chondrite. Therefore, it is suggested that Re is fractionated from Os and Ir among chondritic meteorites.
Ebihara Mitsuru
Ozaki Hiromasa
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