Chondrules in the Qingzhen type-3 enstatite chondrite Possible precursor components and comparison to ordinary chondrite chondrules

Details Chondrules in the Qingzhen type-3 enstatite chondrite Possible precursor components and comparison to ordinary chondrite chondrules Chondrules in the Qingzhen type-3 enstatite chondrite Possible precursor components and comparison to ordinary chondrite chondrules

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1781g&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, Aug. 1985, p. 1781-1795.

Computer Science

21

Chondrites, Chondrule, Meteoritic Composition, Meteoritic Microstructures, Neutron Activation Analysis, Olivine, Pyroxenes, Refractory Materials, Meteorites, Chondrules, Qingzhen, Enstatite, Chondrites, Comparisons, Ordinary Chondrites, Samples, Meteorite, E3 Chondrites, Parent Material, Equilibration, Minerals, Composition, Elements, Concentration, Pyroxene, Lithophiles, Siderophiles, Refractory Material, Silicates, Formation

Scientific paper

The mineral composition of chondrules from a fragment of Qingzhen (EH3) fall was analyzed by neutron activation method. Unlike the ordinary chondrite (OC) chondrules (Gooding and Keil, 1981), the Qingzhen radial pyroxene (RP) and porphyritic pyroxene (PP) chondrules have similar bulk compositions. Porphyritic olivine-pyroxene (POP) chondrules are richer than PP and RP chondrules in refractory lithophiles and siderophiles. Elements in each of the following sets intercorrelate significantly: (1) Fe-Co-Ni-Ir-Au, probably derived from a metal component; (2) Ca-Eu-Se, which suggests an oldhamite-rich precursor; (3) Al-Sc-Hf, occurring in high concentrations in POP chondrules, this set suggesting the existence of a refractory lithophile-rich and olivine-rich component; (4) Na REE; and (5) Cl-Br. Sets (2) and (4) were not precursors of OC. The interelement ratios of refractory lithophiles such as Ca, Al, Ti, Sc, and REE are similar to CI ratios, suggesting that they originated in the earliest phases as silicates, which were sulfurized before chondrule formation.

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