Elemental abundances in chondrules from unequilibrated chondrites Evidence for chondrule origin by melting of pre-existing materials

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Abundance, Chondrites, Chondrule, Meteoritic Composition, Chemical Composition, Evolution (Development), Geochemistry, Melting, Neutron Activation Analysis, Petrography, Meteorites, Chondrules, Chondrites, Elements, Abundance, Origin, Data, Melting, Tieschitz Meteorite, Hallingeberg Meteorite, Chainpur Meteorite, Semarkona Meteorite, Petrography, Properties, Lithophile Elements, Rnaa, Siderophile Elements, Formation, Refractory Elements, Porphyritic, Inaa, Analysis, Procedure, Orgueil Meteorite, Patterns

Scientific paper

Bulk abundances of Na, Mg, Al, Ca, Sc, V, Cr, Ir, and Au were analyzed by neutron activation of chondrules separated from unequilibrated H, L, and LL chondrites and correlated with petrographic properties. The geometric mean composition of the whole-rock chondrule suites are almost indistinguishable from each other for many elements; chondrules are enriched in lithophile and depleted in siderophile elements in a pattern consistent with chondrule formation by melting of preexistent materials. The porphyritic chondrules are more enriched in refractory and siderophile elements as compared with the nonporphyrytic chondrules, indicating that these two chondrule groups may have formed from different precursors.

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