Chemical and physical studies of type 3 chondrites. III Chondrules from the Dhajala H3.8 chondrite

Details Chemical and physical studies of type 3 chondrites. III Chondrules from the Dhajala H3.8 chondrite Chemical and physical studies of type 3 chondrites. III Chondrules from the Dhajala H3.8 chondrite

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1189s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 48, June 1984, p. 1189-1200. Research supported by the Research Corp. and

Physics

2

Chondrites, Chondrule, Geochemistry, Meteoritic Composition, Meteoritic Microstructures, Metamorphism (Geology), Petrography, Thermoluminescence, Meteorites, Ordinary Chondrites, Chemistry, Physical Properties, Glass, Chondrules, Dhajala, H3 Chondrites, Thermoluminescence, Equilibration, Samples, Meteorite, Petrography, Electron Microprobe, Composition, Data, Techniques, Mesostasis, Calcium Oxide, Silicon Dioxide, Metamorphism, Corundum, Anorthite, Abundance, Composition, Type 3 Chondrites, Grains, Devitiri

Scientific paper

Thermoluminescence (TL) properties have been measured in 58 chondrules separated from the Dhajala H3.8 chondrite. The pyrolytic chondrules are noted to have higher mass-normalized TL values than nonpyrolytic ones. Significant correlations are noted between log(TL) and the bulk CaO, Al2O3, and MnO content of the chondrules. These, together with correlations of log(TL) with the CaO, Al2O3, SiO2 and normative anorthite content of the chondrule glass, indicate an association of the TL and the abundance and position of mesostasis. It is suggested that the TL level in a given chondrule is governed by its bulk composition and metamorphism, and it is hypothesized that the devitrification resistance of unequilibrated chondrule mesostasis explains the unequilibration of certain chondrules in type 3 ordinary chondrites.

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