Spinel-producing partial melting reaction in pelitic gneisses: Petrographical and synthetic experimental approach.

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  • BEPPU Masaaki
    Graduate School of Science and Technology, Chiba University Present Address: Raito-Kogyo Co., Ltd.
  • FURUKAWA Noboru
    Department of Earth Sciences, Faculty of Science, Chiba University
  • HIROI Yoshikuni
    Department of Earth Sciences, Faculty of Science, Chiba University

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  • 泥質片麻岩におけるスピネル生成部分融解反応　　記載岩石学的および合成実験的アプローチ
  • デイシツ ヘン マガン ニ オケル スピネル セイセイ ブブン ユウカイ ハンノウ キサイ ガンセキガクテキ オヨビ ゴウセイ ジッケンテキ アプローチ

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Abstract

Petrography of two metatexite specimens from the Abukuma and Ryoke metamorphic belts in Japan suggests that spinel was produced together with cordierite and granitic melt by a partial melting reaction that consumes sillimanite and biotite. Reproductive experiments were performed at a pressure of 200 MPa and temperatures ranging from 700 to 950°C. The starting material was uncrushed Takanuki pelitic gneiss containing abundant biotite and sillimanite without spinel. From the experimental results we confirm that the following spinel-producing partial melting reaction takes place commonly at 800°C and higher temperatures.<br> Sillimanite+biotite+plagioclase+quartz±H2O→spinel+cordierite+granitic melt.<br>Of particular importance is that spinel occurs only within silica-poor portion of the granitic melts produced at temperatures lower than 900°C. On the other hand, spinel is in direct contact with quartz in the run products at 950°C, being in good harmony with the petrogenetic grid of Vielzeuf and Holloway (1988). Thus it can be pointed out that SiO2-undersaturated domains are easily formed locally during partial melting due to kinetic reasons and/or to the complete consumption of quartz by the melting reactions in pelitic rocks.

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