Other
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46..861y&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 46, June 1982, p. 861-875, 877-892.
Other
4
Carbon, Chromites, Cosmochemistry, Meteoritic Composition, Rare Gases, Sorption, Abundance, Adsorption, Chemical Fractionation, Gas-Solid Interactions, Isotopic Enrichment, Oxides, Planetary Atmospheres, Planetary Composition, Spinel, Sulfides, Meteorites, Rare Gases, Chromite, Carbon, Adsorption, Absorption, Sem, Procedure, Techniques, Abundance, Patterns, Entrapment, Fractionation, C2 Chondrites, C3 Chondrites, Formation, Ferrichromite, Characteristics, Phases, Minerals, Mass Spectrometry, Composition, Wa
Scientific paper
The trapping of noble gases by chromite and carbon, two putative carriers of primordial noble gases in meteorites, was studied by synthesizing 19 samples in a Ne-Ar-Kr-Xe atmosphere at 440-720 K. Noble gas contents are found to approximately obey Henry's Law, but only slight correlations are found with composition, surface area, or adsorption temperature. Geometric mean distribution coefficients for bulk samples and HCl residues in 10 cu cm STP/g atm are: Xe 100, Kr 15, Ar 3.5, and Ne 0.62. Elemental fractionation data support the suggestion of Lewis et al. (1977) that chromite and carbon in C2 and C3 chondrites were formed by the reaction: Fe, Cr + 4CO yields (Fe, Cr)3O4 + 4C + carbides. In contrast to meteoritic minerals, the synthetic specimens show no isotopic fractionation of noble gases. In a subsequent study, attention is given to the cases of sulfides and spinels, on the way to consideration of the origin of planetary gases. Sulfides showed three distinctive trends relative to chromite or magnetite. The elemental fractionation pattern of Ar, Kr and Xe in meteorites, terrestrial rocks and planets resembles the adsorption patterns on the carbons, spinels, sulfides, and other solids studied. The high release temperature of meteoritic noble gases may be explained by transformation of the physisorbed or chemisorbed gas. The ready loss of meteoritic heavy gases on surficial oxidation is consistent with adsorption, as is the high abundance.
Anders Edward
Yang Jaek-Jin
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