Chondrules in the Murray CM2 meteorite and compositional differences between CM-CO and ordinary chondrite chondrules

Details Chondrules in the Murray CM2 meteorite and compositional differences between CM-CO and ordinary chondrite chondrules Chondrules in the Murray CM2 meteorite and compositional differences between CM-CO and ordinary chondrite chondrules

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..307r&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 50, Feb. 1986, p. 307-315.

Computer Science

12

Chondrites, Chondrule, Meteoritic Composition, Murray Meteorite, Abundance, Chemical Composition, Chromium, Manganese, Mineralogy, Petrography, Meteorites, Chondrules, Murray, Cm2 Chondrites, Chromium, Manganese, Samples, Meteorite, Stony Meteorites, Composition, Comparisons, Volatiles, Refractory Material, Microprobe Methods, Co3 Chondrites, H Chondrites, Ordinary Chondrites, Lithophiles, Porphyritic Texture, Parent Materials, Abundance, L Chondrites, Ll Chondrites, Mineralogy, Formation, Evaporation, Sili

Scientific paper

Thirteen of the least aqueously altered chondrules in Murray (CM2) were analyzed for bulk compositions, by means of a broad beam electron microprobe, to explore the compositional differences between the CM-CO, and the ordinary chondrite OC chondrules. The CO chondrules are richer in refractory lithophiles and poorer in Cr, Mn, and volatile lithophiles than the OC chondrules; much lower refractory lithophile abundances in CM chondrules resulted from aqueous alteration. Evidence is found for two important lithophile precursor components of CM-CO chondrite chondrules: (1) pyroxene- and refractory-rich, FeO-poor, and (2) olivine-rich, refractoryand FeO-poor. It is suggested that the pyroxene- and refractory-rich, FeO-poor lithophile precursor component has formed by an incomplete evaporation of presolar silicates that brought these materials into the enstatite stability field.

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