Compositional evidence regarding the origins of rims on Semarkona chondrules

Details Compositional evidence regarding the origins of rims on Semarkona chondrules Compositional evidence regarding the origins of rims on Semarkona chondrules

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.3003g&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, Nov. 1987, p. 3003-3011.

Other

9

Chondrule, Meteoritic Composition, Neutron Activation Analysis, Radiochemistry, High Frequencies, Volatility, Meteorites, Composition, Origin, Rims, Chondrules, Semarkona, Sulfide, Samples, Meteorite, Ll3 Chondrites, C Chondrites, Stony Meteorites, Neutron Activation Analysis, Laboratory Studies, Lithophiles, Abundance, Siderophiles, Chalcophiles, Concentration, Patterns, Comparisons, Metal, Formation, Volatiles, Enrichment, Depletion, Evaporation, History, Experiments, Procedure, Petrography, Interior, Tri

Scientific paper

This paper presents results on neutron activation analyses of the interiors and the abraded surfaces of seven chondrules from Semarkona chondrite. The results showed that six of seven chondrule rims have enhanced contents of siderophiles and chalcophiles relative to chondrule interiors, indicating that, during chondrule formation, metal/sulfide melts migrated to the exterior of the chondrule; later reheating caused this material to spread out into fine-grained rim material. For nonvolatile elements, the lithophile and siderophile element abundance patterns in the surfaces are generally similar to those in the corresponding interiors, indicating that the surface and the interior metal might have originated from a single precursor. The volatile to moderately-volatile elements K, As, and Zn tend to be enriched in the surface, compared with other elements of similar mineral affinity.

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