Finding of staurolite-bearing pelitic schists in the Ryoke metamorphic belt of the Dando-san area, Aichi Prefecture and its significance

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  • Miyake Akira
    Department of Earth Sciences, Aichi University of Education
  • Igarashi Yukari
    Graduate, Aichi University of Education Present address; Washizuka Elementary School
  • Inaishi Takumi
    Graduate, Aichi University of Education Present address; Crime Prevention & Traffic Safety Division, Okazaki City Government
  • Taguchi Tomoki
    Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University Institute for Space-Earth Environmental Research, Nagoya University

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  • 愛知県段戸山地域の領家変成帯における含十字石泥質片岩の発見とその意義
  • アイチケンダンド サンチイキ ノ リョウケ ヘンセイタイ ニ オケル ガン ジュウジセキ デイシツヘンガン ノ ハッケン ト ソノ イギ

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<p>Schistose staurolite-bearing pelites occur in the Ryoke Metamorphic Belt, Dando-san area, Aichi Prefecture, Japan. These rocks contain andalusite porphyroblasts and coarse-grained elongate mica-quartz aggregates composed of muscovite, biotite, and quartz in a matrix of muscovite, biotite, quartz, and fibrolite. Staurolite occurs as inclusions in andalusite porphyroblasts and in the minerals of the micaquartz aggregates. Detailed microscopy indicates that a staurolite-consuming and andalusite-producing reaction occurred before the deformation causing the schistosity, such that staurolite grains apart from andalusite porphyroblasts have been replaced by mica-quartz aggregates, and those adjacent to the porphyroblasts have been replaced by andalusite. It is possible that the prograde P-T paths of the staurolite-bearing pelites of the Dando-san and Hazu-Hongu-san areas lie on the high-pressure side of those of staurolite-free pelitic rocks with similar metamorphic grades in other areas of the Ryoke Belt.</p>

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