Mathematics – Logic
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39..911b&link_type=abstract
(Carnegie Institution of Washington, Interdisciplinary Conference on the Physicochemical Behavior and Petrologic Significance of
Mathematics
Logic
2
Chromites, Chromium, Meteoritic Composition, Minerals, Abundance, Chondrites, Iron Meteorites, Silicates, Stony Meteorites
Scientific paper
Chromium is present as a minor element in all meteorite types. Depending on the meteorite type it is lithophile (most frequent), chalcophile (less frequent), or siderophile (rare). Chromium is an indicator of physical and chemical conditions of meteorite formation, especially of the state of oxidation. The Cr contents of meteoritic chromites are related to classification and can be used to distinguish among meteorite types that contain this mineral. The distribution of Cr between coexisting pyroxenes may indicate the degree of equilibration of this mineral pair. Siderophile Cr appears to result from primitive condensation processes rather than secondary reduction processes. The lack of much experimental data on Cr in silicate systems limits the interpretation of the occurrences of Cr-silicate phases, ureyite and krinovite, in the meteorite type in which they occur.
Bunch Ted E.
Olsen Edward
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