Rare-gas-rich separates from carbonaceous chondrites

Details Rare-gas-rich separates from carbonaceous chondrites Rare-gas-rich separates from carbonaceous chondrites

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1775r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Dec. 1978, p. 1775-1797. Research supported by the U.S. Department of Energy and NASA

Computer Science

25

Carbonaceous Chondrites, Meteoritic Composition, Rare Gases, Gas Analysis, Geochemistry, Murray Meteorite, Colloids, Neon, Gases, Carbonaceous Chondrites, Xenon, Rare Gases, Samples, Meteorite, Isotopes, Abundance, Concentration, Allende Meteorite, Murchison Meteorite, Separation, Murray Meteorite, Cold Bokkeveld Meteorite, Sulfur, Spinel, Chromite

Scientific paper

This paper describes an analysis of carbon-rich separates prepared by demineralization of colloidal fractions after disaggregation of bulk samples of the type C2 meteorites Murray, Murchison, and Cold Bokkeveld, as well as a methanol colloid extracted from acid-resistant residues of the Allende meteorite (type C3V) obtained by dissolution of most of the minerals in HCl and HF acids. The carbonaceous separates, or lAlates (a coined word designating colloids prepared sometimes before and sometimes after acid treatment), are characterized incompletely and with difficulty. A stepwise heating experiment on a Murray lAlate is discussed which revealed bimodal release of all noble gases, with similar patterns for Ar, Kr, and Xe. Chemical reactions are suggested as the likely mechanism for gas release. The results are shown to support the concept of a carbonaceous gas carrier uniformly present in meteorites of various types.

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