Other
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39.1021c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 39, Issue 6-7, pp.1021-1024
Other
11
Scientific paper
Analyses of chromite and coexisting olivine or bronzite in various textural associations in the Critical Zone of the Eastern Bushveld Complex are examined for evidence of the extent and nature of postcumulus or subsolidus equilibration of chromite and Fe-Mg silicates. Subsolidus equilibration of chromite inclusions in bronzite and olivine is indicated, and postcumulus or subsolidus equilibration of chromite with postcumulus bronzite is indicated in mottled anorthosite of the H unit. Compositional zoning of cumulus bronzite is inferred to be due to equilibration with cumulus chromite during the postcumulus stage. The main pattern of variation in Mg / Fe ratio and Al 2 O 3 content of chromite with modal per cent chromite is inferred, however, to have been produced during the cumulus stage. The data are consistent with control of chromite precipitation and composition by the oxygen fugacity of the magma, but the effects of changes in pressure or other variables of the magma system on chromite stability and composition are still largely unknown.
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