Decompressional microstructure from garnet-bearing mafic granulite in Yanai district, Ryoke belt, Southwest Japan

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  • 領家帯柳井地域の含ざくろ石苦鉄質グラニュライトから見出された減圧組織
  • リョウケタイ ヤナイ チイキ ノ ガンザクロセキ クテツシツ グラニュライト カラ ミイダサレタ ゲンアツ ソシキ
  • リョウケタイ ヤナイ チイキ ノ ガンザクロイシクテツシツ グラニュライト カラ ミイダサレタ ゲンアツ ソシキ

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Newly found garnet-bearing mafic granulite in Yanai district, Ryoke belt occurs as blocks in gneissose tonalite. This granulite consists mainly of brown hornblende, orthopyroxene and plagioclase, with trace amounts of garnet, biotite and quartz. Garnet porphyroblast up to 3 cm in diameter is locally contained, and is surrounded by orthopyroxene and plagioclase symplectites that coexist with quartz. On the basis of microstructure and mineral assemblage in the garnet-bearing mafic granulite, it reveals that the reaction of garnet + quartz→orthopyroxene + plagioclase occurred at a decompressional process under the granulite facies condition.

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