Petrogenesis of an Episyenite from Iwagi Islet, Southwest Japan: Unique Li–Na Metasomatism during the Turonian

DOI Web Site 被引用文献1件 参考文献110件 オープンアクセス
  • Teruyoshi Imaoka
    Graduate School of Science and Technology for Inovation, Yamaguchi University, Yamaguchi 753-8512, Japan
  • Sachiho Akita
    Asahi Consultant Co., Ltd., 681 Minamigakuma, Tottori 680-0903, Japan
  • Tsuyoshi Ishikawa
    Kochi Institute for Core Sample Research, X-star, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Kochi 783-8502, Japan
  • Kenichiro Tani
    Department of Geology and Paleontology, National Museum of Nature and Science, Tsukuba 305-0005, Japan
  • Jun-Ichi Kimura
    Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka 237-0061, Japan
  • Qing Chang
    Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka 237-0061, Japan
  • Mariko Nagashima
    Graduate School of Science and Technology for Inovation, Yamaguchi University, Yamaguchi 753-8512, Japan

書誌事項

公開日
2024-09-11
資源種別
journal article
権利情報
  • https://creativecommons.org/licenses/by/4.0/
DOI
  • 10.3390/min14090929
公開者
MDPI AG

説明

<jats:p>A unique Li–Na metasomatic rock from Iwagi Islet in Southwest (SW) Japan is an episyenite that contains new Li-rich minerals, including sugilite, katayamalite, murakamiite, and ferro-ferri-holmquistite. We present petrographical, mineralogical, and geochronological data for the protoliths and episyenite. We classified the metasomatic rocks based on the mineral assemblages, from the protolith biotite granite to albitized granite, quartz albitite, hedenbergite albitite, aegirine albitite, sugilite albitite, and katayamalite albitite. The protolith of hedenbergite albitites may have been metasomatic granite that has been subjected to calcic skarnization. Albitites are formed related to fractures and shear zones that focused the fluid flow and metasomatism. Extensive albitization and formation of abundant Li minerals requires involvement of external Li-Na-Cl-rich fluids, which might be related to deep high-temperature Arima-like brines derived from dehydration of the subducted oceanic slab. Formation of the albitites began with quartz dissolution and vug formation, and record interface-coupled dissolution–reprecipitation processes in an open system. The 40Ar/39Ar age of 91.5 ± 0.3 Ma determined for the katayamalite is slightly younger than the protolith zircon U–Pb age of 93.5 ± 1.7 Ma (Turonian), reasonably explaining the timing of Li–Na metasomatism after the petrogenesis of host granites.</jats:p>

収録刊行物

  • Minerals

    Minerals 14 (9), 929-, 2024-09-11

    MDPI AG

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