Annular fluid inclusions from a quartz vein intercalated with metapelites from the Besshi area of the Sanbagawa belt, SW Japan

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著者

    • YOSHIDA Kenta
    • Department of Geology and Mineralogy, Graduate School of Science, Kyoto University
    • HIRAJIMA Takao
    • Department of Geology and Mineralogy, Graduate School of Science, Kyoto University

抄録

Annular fluid inclusions were found in a foliation-parallel quartz vein intercalated with metapelites from the Besshi area of the Sanbagawa belt, SW Japan. The preserved “foam microstructure” of the quartz vein suggests low differential stress at high temperatures for its formation. Three types of fluid inclusions have been identified: the earliest one, FIA-I, is characterized by two phase inclusions arranged along intragranular planes and mainly composed of aqueous saline fluid and CH<sub>4</sub> gas; FIA-II texturally comparable to FIA-I consists of CH<sub>4</sub>-N<sub>2</sub>-CO<sub>2</sub>-H<sub>2</sub> gas phase inclusions with rare two-phase inclusions; the latest type, FIA-III, is characterized by arrangements along transgranular planes consisting of two-phase inclusions mainly composed of CH<sub>4</sub>-N<sub>2</sub> vapor in aqueous saline fluid. Amongst them, FIA-I contains annular fluid inclusions, which are attributed to reequilibration due to a confining pressure increase, suggesting that the host rock underwent the compression after the entrapment of FIA-I. Textural observations and chemical characteristics show that FIA-I and -II were trapped during prograde or near the peak metamorphic stage, and that FIA-III was probably trapped at an early stage of the exhumation.

収録刊行物

  • Journal of mineralogical and petrological sciences

    Journal of mineralogical and petrological sciences 107(1), 50-55, 2012-02-01

    一般社団法人 日本鉱物科学会

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各種コード

  • NII論文ID(NAID)
    10030122256
  • 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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