Sorption of noble gases by solids, with reference to meteorites. I - Magnetite and carbon

Details Sorption of noble gases by solids, with reference to meteorites. I - Magnetite and carbon Sorption of noble gases by solids, with reference to meteorites. I - Magnetite and carbon

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46..841y&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, June 1982, p. 841-860.

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Carbon, Cosmochemistry, Magnetite, Meteoritic Composition, Rare Gases, Sorption, Adsorption, Chemical Fractionation, Chondrites, Gas-Solid Interactions, Planetary Composition, Meteorites, Rare Gases, Magnetite, Carbon, Simulations, Adsorption, Absorption, Phases, Techniques, Procedure, Experiments, Pressure, Data, Atmosphere, Temperature, Fractionation, Patterns, Analysis, Minerals, Mass Spectrometry, Sources, Composition, Carbynes, Element Ratios, Distribution, Surface, Thermal Effects, Analogs, Concentrat

Scientific paper

The trapping of meteoritic noble gases by solids is simulated through the synthesis of 18 Fe3O4 samples at 350-720 K in a noble gas atmosphere, by means of the reactions: (1) 3Fe + 4H2O yields Fe3O4 + 4H2, using Ne, Ar, Kr and Xe; and (2) 3Fe + 4CO yields Fe3O4 + 4C + carbides, using Xe. Etching experiments suggest an analogy with 'Phase Q' in meteorites. Adsorbed atmospheric gases are present in all samples, and dominate whenever the noble gas partial pressure in the atmosphere is greater than that in the synthesis. While many of the results of Lancet and Anders (1973) appear to have been dominated by such an atmospheric component, others are suspect. When the doubtful samples of Lancet and Anders are corrected or eliminated, the fractionation pattern no longer peaks at Ar, but rather, as in the present sample, rises monotonically from Ne to Xe. No evidence is found for the earlier study's claim of a strong temperature dependence.

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