Chromites in unequilibrated ordinary chondrites

Details Chromites in unequilibrated ordinary chondrites Chromites in unequilibrated ordinary chondrites

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1009n&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 009.

Mathematics

Logic

Chromites, Chondrule, Spinel, Chondrites, Metamorphism (Geology), Iron, Aluminum

Scientific paper

Minor but significant amounts of chromian spinels and spinels are ubiquitous components of ordinary chondrites (OCs). Earlier studies of equilibrated OCs have shown that chromite compositions and textural settings are related to the petrologic type of ordinary chondrite (H, L, LL) and their metamorphic history. These have been shown to be compositionally uniform in each meteorite type and within each meteorite. Consistency within individual OCs has been shown to be inaccurate in studies of chromites from some type 4-6 OCs. More importantly, the extent of the variations in chromite compositions and textural settings from well characterized unequilibrated ordinary chondrites (UOCs) have been sparse in the literature. In particular, there have been no systematic studies that relate the chromites in UOCs to the progressive metamorphism scale as determined by thermoluminescence (TL) sensitivity. Is there a progression of changes in chromites from H3.4-3.8, from L3.3-3.8, or from LL3.0-3.8? Are chromites in UOCs sensitive to TL parameters? Are there differences between the chromite populations in low type 3 H, L and LL chromites? What is the significance of these results?

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