On the siting of noble gases in E-chondrites

Details On the siting of noble gases in E-chondrites On the siting of noble gases in E-chondrites

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.2351c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Nov. 1982, p. 2351-2361.

Computer Science

13

Chemical Fractionation, Chondrites, Gas Composition, Isotopic Enrichment, Meteoritic Composition, Rare Gases, Chondrule, Enstatite, Mass Spectroscopy, Metamorphism (Geology), Radioactive Age Determination, Solar System

Scientific paper

Fractions of six E-chondrites were separated by density, grain size, and chemical resistance to determine the siting of noble gases. The samples were taken from the Qingzhen (E3), Indarch (E4), Abee and Saint Saveur (E4-5), and Yilmia and North West Forrest (E6) meteorites. The Ar-rich component of the E6s was concentrated in the enstatite-rich fraction. This subsolar component was resistant to HCl and HNO3 treatment, but could be partially dissolved by HF, implying that the subsolar component is located in the enstatite. The noble gases were transported there by metamorphism. Xe-129 was found in the same regions in the E6s, but was in areas associated with chondrules in the E4s. Additionally, the carbon-rich fraction of the E4 sample displayed Xe and Ne/CCF-Xe isotopic ratios similar to that found in C-chondrites. E3 and E4 primordial gases were analogous, with no subsolar contribution.

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