Chemical factors controlling occurrence of staurolite in the Ryoke metamorphic rocks of the Hongu-san area, Aichi Prefecture

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  • Shisaka Shunya
    Graduate School, Aichi Universiry of Education
  • Naito Takahito
    Graduate, Aichi University of Education Present address：Nanbu Junior High School
  • Sugiura Yasuhiko
    Graduate, Aichi University of Education Present Address：Oharu Office
  • Inaishi Takumi
    Graduate, Aichi University of Education Present Address：Crime Prevention & Traffic Safety Division, Okazaki City Government
  • Taguchi Tomoki
    Institute for Space-Earth Environmental Research, Nagoya University Department of Geology and Mineralogy, Graduate School of Science, Kyoto University
  • Miyake Akira
    Department of Earth Sciences, Aichi University of Education

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  • 愛知県本宮山地域における領家変成岩中の十字石の産状を制御する化学的要因
  • アイチケン ホングウ サンチイキ ニ オケル リョウケ ヘンセイガン チュウ ノ ジュウジセキ ノ サンジョウ オ セイギョ スル カガクテキ ヨウイン

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Abstract

<p>Eleven localities of staurolite-bearing metapelites and pelitic bands in metachert, are reported from the Ryoke metamorphic belt in the Hongu-san area (Aichi Prefecture, Japan). Staurolite occurs as inclusions within andalusite porphyroblasts and within mica-quartz aggregates in metapelites. On the other hand, staurolite in pelitic bands in metachert, occurs not only as inclusions within mica-quartz aggregates but also as porphyroblast. Petrographic observations indicate that the mica-quartz aggregates were formed by replacing staurolite porphyroblasts during prograde stage of the Ryoke regional metamorphism. Based on the widespread spatial distribution of the mica-quartz aggregates, it is suggested that staurolite was widely produced in the area. During subsequent stages of prograde and peak metamorphism, staurolite became unstable in some rocks while remaining stable in others. Thermodynamic calculations reveal that the Ti content of biotite and the Zn content of staurolite affect the stability of staurolite, thus explaining its heterogeneous preservation in the study area.</p>

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