Computer Science
Scientific paper
Oct 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31.1569b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 31, Issue 10, pp.1569-1582
Computer Science
39
Scientific paper
Analyses of chromite from forty-six ordinary chondrites were made using electron microprobe techniques. Two correlations were found between chromite composition and chondrite classification. First, the composition of chromite in "equilibrated" ordinary chondrites changes in an orderly fashion from H to L to LL groups, in accordance with changes in olivine and orthopyroxene compositions. Second, within the three major ordinary chondrite groups, chromite composition is related to petrographic subgroup. The observed trends are consistent with either a metamorphic or primary igneous origin of chondrites of different petrographic subgroups. Notable amounts of vanadium were found in all analyzed chromites. Vanadium is enriched in chromite in comparison to the bulk meteorite by a factor of 70. The portion of the total vanadium combined in chromite increases from lower- to higher-numbered subgroups due to an increase in total chromite content of the meteorites.
Bunch Ted E.
Keil Klaus
Snetsinger Kenneth G.
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