Other
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991geokh......853f&link_type=abstract
Geokhimiia (ISSN 0016-7525), June 1991, p. 853-861. In Russian.
Other
Carbonaceous Chondrites, Isotopic Enrichment, Meteoritic Composition, Xenon Isotopes, Acids, Grain Size, Iodine Isotopes, Neutron Irradiation
Scientific paper
Isotopic compositions of three samples (E19, E20, and E22) of the Efremovka carbonaceous chondrite, obtained after 'hard' acid treatment of the original specimens were investigated. Results indicate that the fine-grained E19 contains Xe enriched by nucleogenic Xe-X. Samples E20 and E22 were found to be enriched by Xe-136, Xe-134, Xe-128, Xe-126, and Xe-124, in ratios that have no analogies among acid-resistant residues of other carbonaceous chondrites. It is suggested that the enrichment of Efremovka samples by heavy Xe isotopes was caused by the presence of Xe = H (CCF = Xe) or a mixture of extensively mass-fractionated solar Xe with Xe = X, whereas the enrichment by light Xe isotopes was caused by a intense neutron irradiation of some of the mineral phases of these samples previous to accretion.
Fisenko Anatolii V.
Lavrukhina A. K.
Semenova L. F.
Shukoliukov Iu. A.
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