Classification of the Allan Hills A77307 meteorite

Details Classification of the Allan Hills A77307 meteorite Classification of the Allan Hills A77307 meteorite

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983metic..18....1s&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 18, March 31, 1983, p. 1-7.

Mathematics

Logic

3

Carbonaceous Chondrites, Classifications, Meteoritic Composition, Thermoluminescence, Luminous Intensity, Petrology, Phosphors, Weathering, Meteorites, Antarctic Meteorites, Allan Hills Meteorites, Alha77307, Classification, Thermoluminescence, Comparisons, Co Chondrites, Petrology, Composition, Experiments, Carbonaceous Chondrites

Scientific paper

Thermoluminescence (TL) measurements on Allan Hills A77307 (AH), a carbonaceous chondrite found in Antarctica, are compared with those on other chondrite and applied to its classification. Two lithologically different 250-mg samples were ground, freed of magnetic material, and ground again to pass a 100-micron sieve. Aliquots of 4 mg were heated to 500 C, exposed to beta radiation from a Sr-90 source, and heated at a rate of 7.3 C/sec in N2. TL was measured with a photomultiplier tube fitted with thermal and blue filters. Glow curves for AH and for seven other, established CO-type chondrites area presented, all exhibiting two major peaks of TL sensitiviity. The peaks for the seven CO-type chondrites are found at 91 + or - 7 C and at 203 + or - 11 C; those for AH at 170 + or - 17 C and at approximately 250 C. This difference is considered significant and not due to random fluctuation or a typical sampling. From this comparison and from consideration of the weathering, preterrestrial-alteration, petrological and compositional evidence on AH, it is concluded that AH is a unique chondrite, possessing both similarities to and differences from the CO class.

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