Formation of high-pressure minerals in shocked L6 chondrite Yamato 791384: Constraints on shock conditions and parent body size

Eiji Ohtani, Yukiko Kimura, Makoto Kimura, Toshiko Takata, Tadashi Kondo, Tomoaki Kubo

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

We have studied the high-pressure phases observed in Yamato 791384 L6 chondrite. Host meteorite mainly consists of olivine, pyroxenes and plagioclase glass. Mineral fragments observed in the veins and the vein margin region of the host meteorite were partially or totally transformed into high-pressure phases; ringwoodite, majorite, akimotoite, NaAlSi3O8 hollandite and jadeite. Matrix of the shock vein contains majorite-pyrope solid solution. The spatial distribution indicates that high-pressure phases are present in the shock veins and host rocks adjacent to the shock veins. Investigation of the high-pressure phases revealed that, in Y791384, fragments and adjacent matrix were subjected to pressures around of 18-23 GPa and the vein experienced temperatures around 2300 °C during the shock event. Ringwoodite lamellae were observed in the host olivine adjacent to the vein. Kinetic investigation for ringwoodite lamellar growth in olivine indicates that the shocked meteorite experienced the pressure for at least 4 s. Such long duration of the pressure pulse indicates that the size of the parent body was greater than 10 km.

Original languageEnglish
Pages (from-to)505-515
Number of pages11
JournalEarth and Planetary Science Letters
Volume227
Issue number3-4
DOIs
Publication statusPublished - Nov 15 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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