Kamacite and olivine in ordinary chondrites - Intergroup and intragroup relationships

Details Kamacite and olivine in ordinary chondrites - Intergroup and intragroup relationships Kamacite and olivine in ordinary chondrites - Intergroup and intragroup relationships

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1217r&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, May 1990, p. 1217-1232.

Mathematics

Logic

71

Chemical Composition, Chondrites, Grain Size, Olivine, Electron Probes, Metamorphic Rocks, Solar System, Meteorites, Stony Meteorites, Chondrites, Ordinary Chondrites, Kamacite, Mineralogy, Olivine, Samples, Meteorite, Composition, Catalog, Metal, Laboratory Studies, Microprobe Methods, H Chondrites, Grains, Netschaevo, L Chondrites, Ll Chondrites, Chondrites, Parent Bodies, Equilibration, Procedure, Classification, Distribution, Fractionation, Collisions, Oxidation, Cobalt, Nickel, Comparisons, Abundance,

Scientific paper

Results are presented from high-precision electron microprobe analyses of olivine and kamacite in a suite of 134 ordinary chondrites (OCs). The compositional ranges of these phases are defined for each OC group (high total Fe, low total Fe, and low total Fe/low metallic Fe). Anomalous OCs that have olivine and/or kamacite compositions that lie outside the established ranges are identified. The phases in the chondritic clasts of the Netschaevo iron meteorite are characterized to determine the relationship between Netschaevo and OCs. Intragroup variations of olivine and kamacite compositions with petrologic type are examined and OCs that contain olivine and/or kamacite grains with aberrant compositions are identified as fragmental breccias. Also, a search for new metallic Fe-Ni phases with extreme compositions is conducted. As a result of these analyses, several meteorites are reclassified.

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