Discovery of (Mg,Fe)SiO<sub>3</sub> tetragonal garnet in a shocked chondrite

DOI
  • Tomioka Naotaka
    Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology
  • Miyahara Masaaki
    Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University
  • Ito Motoo
    Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology

Bibliographic Information

Other Title
  • 衝撃を受けた隕石中の(Mg,Fe)SiO<sub>3</sub>正方晶ガーネットの発見

Abstract

Distorted garnet with a tetragonal symmetry was discovered in fragments of host rock in a melt vein in a shocked chondrite by ATEM. The garnet occurs as aggregates of fine-grained crystals (< 1.5µm in size) with nearly the same chemical composition with the host low-Ca pyroxene. This occurrence indicates the tetragonal garnet has formed a solid-state transformation from the host pyroxene at >1600 °C and 16-22 GPa. Cooling rate of the melt vein was estimated to be larger than 103 °C/sec based on diffraction intensity analysis of the garnet.

Journal

Keywords

Details 詳細情報について

  • CRID
    1390846609793270912
  • NII Article ID
    130007785285
  • DOI
    10.14824/jakoka.2015.0_152
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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