Chemical and physical studies of type 3 chondrites. IX - Thermoluminescence and hydrothermal annealing experiments and their relationship to metamorphism and aqueous alteration in type below 3.3 ordinary chondrites

Details Chemical and physical studies of type 3 chondrites. IX - Thermoluminescence and hydrothermal annealing experiments and their relationship to metamorphism and aqueous alteration in type below 3.3 ordinary chondrites Chemical and physical studies of type 3 chondrites. IX - Thermoluminescence and hydrothermal annealing experiments and their relationship to metamorphism and aqueous alteration in type below 3.3 ordinary chondrites

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..119g&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, Jan. 1988, p. 119-127.

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4

Annealing, Chondrites, Metamorphism (Geology), Meteorites, Moisture Content, Thermoluminescence, Chemical Properties, Physical Properties, Meteorites, Chemistry, Physical Properties, Stony Meteorites, Annealing, Laboratory Studies, Experiments, Hydrothermal Effects, Thermoluminescence, Metamorphism, Ordinary Chondrites, Samples, Meteorite, Semarkona, Sharps, Alha77214, Dhajala, Procedure, Alterations, Sensitivity, Chondrites

Scientific paper

Thermoluminescence (TL) properties were measured in samples of four type-3.0 chondrites annealed at 400-850 C and 0.77-1 kbar in the presence of various amounts of water and sodium disilicate. Several changes recorded in TL characteristics, such as the lowering of TL sensitivity in certain samples, its increase in other samples, and changes in the peak position and peak width of TL suggested the occurrence of metamorphic processes in these samples. It is suggested that, for the chondrite types above 3.2, the observed changes in TL are consistent with the TL-metamorphism trends, being due to the formation of feldspar by the devitrification of chondrule glass during metamorphism. For types below 3.2, the TL data are consistent with the hypothesis that these chondrules experienced lower levels of metamorphism than the higher types or, alternatively, with the hypothesis that the type 3.0 chondrules are being produced from higher types by aqueous alteration.

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