Isotopically distinguishable carbon phases in the Allende meteorite

Details Isotopically distinguishable carbon phases in the Allende meteorite Isotopically distinguishable carbon phases in the Allende meteorite

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.297..381s&link_type=abstract

Nature, vol. 297, June 3, 1982, p. 381-383. Research supported by the Science and Engineering Research Council.

Physics

14

Carbon Isotopes, Carbonaceous Chondrites, Oxidation, Solid Phases, Combustion Products, Rare Gases, Temperature Distribution, Meteorites, Carbon, Phases, Isotopes, Allende Meteorite, Oxidation, Temperature, Grain Size, Rare Gases, Systematics, Matrix, Minerals, Carbonaceous Chondrites, C3V Meteorites, Samples, Meteorite, Abundance, Experiments, Procedure, Isotopic Ratios, Patterns, Techniques, Data

Scientific paper

Stepwise oxidation of the Allende meteorite is reported that shows at least three isotopically distinct carbon phases, each combustible over different temperature ranges. The temperature of combustion is dependent both on grain size of the fragments studied and/or on the nature of the carbonaceous material and its availability to the oxygen. An attempt is made to correlate the isotopic signatures recognized with phases whose existence has been postulated to explain noble gas systematics and to provide some insight into the nature and location of these phases. Most of the carbon exists predominantly in the matrix and has been reported to be the host of most of the normal planetary noble gases. Carbon protected in mineral grains may be isotopically heavier, but is still more easily oxidized than graphite when exposed by HF/HCl demineralization.

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