The Majorite-Pyrope + Magnesiowüstite Assemblage: Constraints on the History of Shock Veins in Chondrites

DOI Web Site 被引用文献31件
  • Ming Chen
    M. Chen, Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany, and Guangzhou Institute of Geochemistry, Academia Sinica, 510640 Guangzhou, China.
  • Thomas G. Sharp
    T. G. Sharp, Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany.
  • Ahmed El Goresy
    A. El Goresy, Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
  • Brigitte Wopenka
    B. Wopenka, Department of Earth and Planetary Sciences, Washington University, St. Louis, MO 63130, USA.
  • Xiande Xie
    X. Xie, Guangzhou Institute of Geochemistry, Academia Sinica, 510640 Guangzhou, China.

書誌事項

公開日
1996-03-15
DOI
  • 10.1126/science.271.5255.1570
公開者
American Association for the Advancement of Science (AAAS)

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説明

<jats:p>Shock veins in the Sixiangkou (L6) chondrite contain two high-pressure assemblages: (i) majorite-pyrope solid solution plus magnesiowüstite that crystallized at high pressures and temperatures from a shock-induced silicate melt of bulk Sixiangkou composition and (ii) ringwoodite plus low-calcium majorite that were produced by solid-state transformation of olivine and low-calcium pyroxene. The morphology and chemistry of the majorite-pyrope garnet and the size of the magnesiowüstite crystals indicate a longer duration at high pressure and temperature than predicted by impact scenarios. This pressure-temperature regime is constrained by the olivine-ringwoodite and orthopyroxene-majorite phase transformations, fusion of the meteorite constituents, and crystallization of majorite-pyrope solid solution plus magnesiowüstite from that melt under high pressure.</jats:p>

収録刊行物

  • Science

    Science 271 (5255), 1570-1573, 1996-03-15

    American Association for the Advancement of Science (AAAS)

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