Raman and NMR spectroscopic characterization of high-pressure K-cymrite (KAlSi_3O_8・H_2O) and its anhydrous form (kokchetavite)

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著者

    • KANZAKI Masami
    • Institute for Study of the Earth's Interior, Okayama University
    • XUE Xianyu
    • Institute for Study of the Earth's Interior, Okayama University
    • ZHANG Qian
    • School of Earth and Space Sciences, Peking University

抄録

To facilitate identification of high-pressure K-cymrite (KAlSi<sub>3</sub>O<sub>8</sub>·H<sub>2</sub>O) phase and its anhydrous form (kokchetavite) in natural rocks, we have synthesized both phases and have characterized them by micro-Raman and NMR spectroscopy. K-cymrite was synthesized at 5 GPa and 800 °C. Kokchetavite was obtained by dehydrating K-cymrite at ambient pressure and 550 °C. The <sup>1</sup>H MAS and <sup>1</sup>H-<sup>29</sup>Si CP MAS NMR spectra of K-cymrite are consistent with the reported crystal structure that contains H<sub>2</sub>O molecules and has a disordered Si-Al distribution. The Raman spectra obtained under ambient conditions for K-cymrite (and kokchetavite) contain major peaks at 114.0 (109.1), 380.2 (390.0) and 832.5 (835.8) cm<sup>-1</sup>. For K-cymrite, OH stretching vibration is also observed at 3541 cm<sup>-1</sup> with a shoulder at 3623 cm<sup>-1</sup>. The Raman spectrum for kokchetavite is consistent with that previously reported for a natural sample found as inclusions in clinopyroxenes and garnets in a garnet-pyroxene rock. However, the data for K-cymrite are inconsistent with the Raman features of a previously reported “relict K-cymrite in K-feldspar” from an eclogite. Pressure- and temperature-dependencies of the Raman shifts for the strongest peak of both phases are also reported.

収録刊行物

  • Journal of mineralogical and petrological sciences

    Journal of mineralogical and petrological sciences 107(2), 114-119, 2012-04-01

    一般社団法人 日本鉱物科学会

参考文献:  17件中 1-17件 を表示

各種コード

  • NII論文ID(NAID)
    10030122449
  • NII書誌ID(NCID)
    AA11460926
  • 本文言語コード
    ENG
  • 資料種別
    SHO
  • ISSN
    13456296
  • データ提供元
    CJP書誌  J-STAGE 
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