Noble-gas-rich separates from the Allende meteorite

Details Noble-gas-rich separates from the Allende meteorite Noble-gas-rich separates from the Allende meteorite

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.1751o&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, Oct. 1981, p. 1751-1788. Research supported by the U.S. Department of Energy and NASA

Computer Science

38

Carbonaceous Meteorites, Meteoritic Composition, Rare Gases, Residues, Abundance, Carbon, Demineralizing, Hydrochloric Acid, Hydrofluoric Acid, Sulfur, Characteristics, Mass Spectrometry, Concentrations, Hydrogen, Anomalies, Neutron Activation Analysis, Pyrolysis, Chromite, Distribution, Sulfur, Models, Xenon, Entrapment, Metals, Solubility, Neon, Phases, Origin, Spallogenic Gases, Electron Microscopy, Particles, Size, Techniques, Meteorites, Allende Meteorite, Rare Gases, Residues, Separation, Data, Sample

Scientific paper

Predominantly carbonaceous HF/HCl-resistant residues from the Allende meteorite are studied. Samples are characterized by SEM/EDXA, X-ray diffraction, INAA, C, S, H, N, and noble gas analyses. Isotopic data for carbon show variations no greater than 5%, while isotopic data from noble gases confirm previously established systematics. Noble gas abundances correlate with those of C and N, and concomitant partial loss of C and normal trapped gas occur during treatments with oxidizing acids. HF/HCl demineralization of bulk meteorite results in similar fractional losses of C and trapped noble gases, which leads to the conclusion that various macromolecular carbonaceous substances serve as the main host phase for normal trapped noble gases and anomalous gases in acid-resistant residues, and as the carrier of the major part of trapped noble gases lost during HF/HCl demineralization. Limits on the possible abundances of dense mineralic host phases in the residues are obtained, and considerations of the nucleogenetic origin for CCF-XE indicate that carbonaceous host phases and various forms of organic matter in carbonaceous meteorites may have a presolar origin.

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