Thermal and shock metamorphism of the sixiangkou ordinary chondrite

Details Thermal and shock metamorphism of the sixiangkou ordinary chondrite Thermal and shock metamorphism of the sixiangkou ordinary chondrite

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008acasn..49...55d&link_type=abstract

Acta Astronomica Sinica, vol. 49, no. 1, p. 55-66

Mathematics

Logic

Meteors, Meteoroids, Astrochemistry, Methods: Laboratory

Scientific paper

The Sixiangkou meteorite is a heavily shocked chondrite that contains numerous shock-induced melt veins of various widths. This paper focuses on the petrography and mineralogy of the host portion and shock veins of Sixiangkou. This meteorite contains relict chondrules with obscure structures and shapes. We calculate the peak equilibration temperature (891±36°C) recorded in the Sixiangkou L6 chondrite using the two-pyroxene geothermometer. The thermal metamorphic features of Sixiangkou are in accordance with the petrologic type 6. Olivine in the host portion of the chondrite shows obvious undulatory extinction and planar deformation features. Abundant maskelynite occurs in the chondrite. The shock veins contain numerous coarse-grained ringwoodite, majorite, and fine-grained high-pressure mineral assemblages. On the basis of these observations, Sixiangkou can be graded as S6 on the shock metamorphism scale. And it can also be inferred that the peak pressure which melt veins experienced is about 20GPa---24GPa and the temperature is higher than 2000°C. Merrilite and chromite in the shock veins are possibly transformed back from their high-pressure to low-pressure phases during the prolonged shock event Sixiangkou experienced.

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