Thermoluminescence and compositional zoning in the mesostasis of a Semarkona group A1 chondrule and new insights into the chondrule-forming process

Details Thermoluminescence and compositional zoning in the mesostasis of a Semarkona group A1 chondrule and new insights into the chondrule-forming process Thermoluminescence and compositional zoning in the mesostasis of a Semarkona group A1 chondrule and new insights into the chondrule-forming process

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.2101m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 9, p. 2101-2110.

Computer Science

29

Chondrule, Meteoritic Composition, Petrography, Thermoluminescence, Chondrites, Olivine, Meteorites, Thermoluminescence, Composition, Zoning, Chondrites, Dust, Chondrules, Semarkona, Ll3 Chondrites, Chondrites, Stony Meteorites, Samples, Meteorite, Mesostasis, Description, Laboratory Studies, Origin, Mineralogy, Formation, Hypotheses, Reduction, Condensation, Procedure, Petrography, Chemistry, Fractional Crystallization, Aqueous Alteration, Soret Effect, Silicon Dioxide, Sodium Oxide, Manganese Oxide, Inten

Scientific paper

A large, group A1, porphyritic olivine chondrule in the Semarkona chondrite with induced thermoluminescence (TL) and compositional zoning in its mesostasis has been discovered. The chondrule has Ca-rich and Fe-poor olivine and its mesostasis is highly anorthite-normative. The chondrule shows an intense induced TL peak at about 300 C with a half-width of about 180 C. The induced TL in the 40-440 C range increases monotonically by a factor of about 6 from center to rim, while SiO2, Na2O, and MnO increase by factors of about 1.1, about 3.6, and about 6, respectively. The spectrum of the induced TL over the 200-350 C range and the Mn-TL correlation suggest Mn-activated plagioclase is an important constituent of the refractory mesostases in group A1 chondrules. The zoning may reflect fractional crystallization, Soret diffusion, transport of volatiles into the chondrule by aqueous alteration, a zoned precursor, reduction of precursor dust aggregate, or recondensation of volatiles lost during chondrule formation.

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