Inhomogeneous distribution of materials in lodranites-acapulcoites and IAB irons and their common formation processes

Details Inhomogeneous distribution of materials in lodranites-acapulcoites and IAB irons and their common formation processes Inhomogeneous distribution of materials in lodranites-acapulcoites and IAB irons and their common formation processes

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994lpi....25.1375t&link_type=abstract

In Lunar and Planetary Inst., The Twenty-Fifth Lunar and Planetary Science Conference. Part 3: P-Z p 1375-1376 (SEE N94-35448 11

Physics

3

Chemical Analysis, Dimensional Analysis, Grain Size, Inclusions, Meteorites, Mineralogy, Minerals, Silicates, Abundance, Coarseness, Heterogeneity, Low Temperature, Oxygen

Scientific paper

The two-dimensional chemical mapping analysis (CMA) techniques of EPMA and XRF were applied to a new polished thin section (PTS) of EET84302,28, Acapulco and a 5x3 cm slice of Caddo County to find heterogeneous regional distribution of low temperature fractions in the lodranite-acapulcoite groups and silicate inclusions in the IAB irons. A region richer in metal-plagioclase was found in EET84302,28 and Caddo County. The mineralogy of EET84302,28 is not much different from coarse-grained, metal-rich acapulcoite-like mineral assemblage in EET84302,19, which has chromite-orthopyroxene segregation. Nearly uniform Mg/Fe ratios of silicates modified by reduction at regional oxygen fugacity and large difference in modal abundances of minerals in this meteorite group can be explained by regional concentration of materials when the source materials were partly melted.

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