Mathematics – Logic
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985metic..20..175r&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 20, pt. 1, June 30, 1985, p. 175-196.
Mathematics
Logic
26
Carbonaceous Chondrites, Meteoritic Composition, Petrology, Breccia, Kamacite, Metamorphism (Geology), Meteoritic Microstructures, Mineralogy, Olivine, Pyroxenes, Thermoluminescence, Weathering, Meteorites, Colony, Co3 Chondrites, Equilibration, Description, Glass, Composition, Physical Properties, Texture, Mineralogy, Classification, Inclusions, Chondrules, Comparisons, Elements, Abundance, Depletion, Glow Curve, Weathering, Samples, Meteorite, Carbonaceous Chondrites, Petrology
Scientific paper
The Colony meteorite is an accretionary breccia containing several millimeter- to centimeter-size chondritic clasts embedded in a chondritic host. Colony is one of the least equilibrated CO3 chondrites; it has an unrecrystallized texture and contains compositionally heterogeneous olivine and low-Ca pyroxene, kamacite with low Ni and Co and high Cr, amoeboid inclusions with low FeO and MnO, a fine-grained silicate matrix with very high FeO, and numerous small chondrules with clear pink glass. However, Colony differs from normal CO chondrites in several respects: although Al, Sc, V, Cr, Ir, Fe, Au and Ga abundances are consistent with a CO chondrite classification, certain lithophiles (Mg and Mn), siderophiles (Ni and Co) and chalcophiles (Se and Zn) are depleted by factors of 10-40%. The shape of Colony's thermoluminescence glow curve is similar to that of Allan Hills A77307 (another unequilibrated chondrite with CO3 petrological characteristics) and different from those of normal CO chondrites.
James J. A.
Jarosewich Eugene
Keck Bradley D.
Rubin Alan E.
Sears Derek W. G.
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