Refractory precursor components of Semarkona chondrules and the fractionation of refractory elements among chondrites

Details Refractory precursor components of Semarkona chondrules and the fractionation of refractory elements among chondrites Refractory precursor components of Semarkona chondrules and the fractionation of refractory elements among chondrites

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..759g&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 47, April 1983, p. 759-771.

Other

38

Chemical Fractionation, Chondrites, Chondrule, Meteoritic Composition, Refractory Materials, Abundance, Neutron Activation Analysis, Petrology, Solar Corona, Meteorites, Chondrites, Refractory Elements, Fractionation, Chondrules, Semarkona, Source, Origin, Lithophiles, Compositon, Samples, Meteorite, Neutron Activation Analysis, Inaa, Concentrations, Iron, Oxidation, Silicon, Condensation, Condensates, Equilibration, Temperature, Matrix, Magnesium, Ordinary Chondrites, Enstatites, Comparisons

Scientific paper

Instrumental neutron activation analysis has been used to measure about 20 of the lithophile elements in 30 chondrules from the Semarkona chondrite. The amounts of oxidized iron were calculated from other compositional parameters, and Si concentrations are estimated from mass-balance considerations. It is suggested that the refractory component probably forms from fine grained materials that were able to equilibrate down to lower nebular temperatures. The chondrite matrix may have had an origin similar to that of the nonrefractory material. The low abundance of refractories and Mg in ordinary and enstatite chondrites was produced by the loss of materials having a higher refractory element/Mg ratio than that of the refractory element of the chondrules.

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