Shock‐induced thermal history of an <scp>EH</scp>3 chondrite, Asuka 10164

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  • M. Kimura
    Faculty of Science Ibaraki University Mito 310‐8512 Japan
  • A. Yamaguchi
    National Institute of Polar Research Tokyo 190‐8518 Japan
  • M. Miyahara
    Department of Earth and Planetary Systems Science Graduate School of Science Hiroshima University Higashi‐Hiroshima 739‐8526 Japan

書誌事項

公開日
2016-09-26
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1111/maps.12738
公開者
Wiley

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<jats:title>Abstract</jats:title><jats:p>Shock‐induced features are abundantly observed in meteorites. Especially, shock veins, including high‐pressure minerals, characterize many kinds of heavily shocked meteorite. On the other hand, no high‐pressure phases have been yet reported from enstatite chondrites. We studied a heavily shocked <jats:styled-content style="fixed-case">EH</jats:styled-content>3 chondrite, Asuka 10164, containing a vein, which comprises fragments of fine‐grained silicate and opaque minerals, and chondrules. In this vein, we found a silica polymorph, coesite. This is the first discovery of a high‐pressure phase in enstatite chondrites. Other high‐pressure polymorphs were not observed in the vein. The assemblages and chemical compositions of minerals, and the occurrence of coesite indicate that the vein was subjected to the high‐pressure and temperature condition at about 3–10 <jats:styled-content style="fixed-case">GP</jats:styled-content>a and 1000 °C. The host also experienced heating for a short time under lower temperature conditions, from ~700 to ~1000 °C, based on the opaque minerals typical of <jats:styled-content style="fixed-case">EH</jats:styled-content> chondrites and textural features. Although the pressure condition of the vein in this chondrite is much lower than those in the other meteorites, our results suggest that all major meteorite groups contain high‐pressure polymorphs. Heavy shock events commonly took place in the solar system.</jats:p>

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