Isotope composition of oxygen in chondrules from the Kainsaz CO, Andreevka L3, and Elenovka L5 chondrites

Details Isotope composition of oxygen in chondrules from the Kainsaz CO, Andreevka L3, and Elenovka L5 chondrites Isotope composition of oxygen in chondrules from the Kainsaz CO, Andreevka L3, and Elenovka L5 chondrites

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992geokh...7..915l&link_type=abstract

Geokhimiia (ISSN 0016-7525), no. 7, July 1992, p. 915-922. In Russian.

Other

Carbonaceous Chondrites, Chondrule, Isotope Effect, Meteoritic Composition, Oxygen Isotopes, Cosmic Dust, Olivine, Pyroxenes

Scientific paper

Results are presented on the isotope composition of oxygen in chondrules from the Kainsaz CO chondrite, which is a nonmetamorphized carbonaceous chondrite, and the Andreevka L3 and Elenovka L5 chondrites, which underwent various metamorphic alterations. The results obtained on the composition of chondrules from the Kainsaz chondrite indicate that chondrules of this chondrite were formed at P-T conditions that were different from those for the chondrules of the Allende chondrite. The oxygen isotope composition of Andreevka L3 chondrules was found to be heterogeneous. For the most common chondrule size of the Andreevka L3, an enrichment in O-16 relative to chondrules of other chondrites is observed. The Elenovka L5 chondrules were characterized by a decrease in contents of O-17 and O-18 with increasing chondrule size. Elenovka chondrules keep relics of the early mass-fractionation process due to the kinetic isotope effect during the evaporation of melted chondrules.

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