四国中央部三波川帯瀬場谷地域の塩基性片岩中に産する累進的エクロジャイト

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  • シコク チュウオウブ サンバガワタイ セバダニ チイキ ノ エンキセイ ヘンガ
  • Prograde eclogites from Sambagawa basic schists in the Sebadani area, central Shikoku, Japan
  • シコク チュウオウ サンバガワタイ セバダニ チイキ ノ エンキセイ ヘンガンチュウ ニ サンスル ルイシンテキ エクロジャイト

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In the Besshi district of the Sambagawa metamophic belt，basic schist layers o㏄ur crossing the middle portions of the Seba valley，there are two texture types of prograde eclogites．One is fomed by contact metamorphism of emplacement of high grade tectonic-block. They occur in the area that is only a few 1O m from the tectonic-block．They are randomly oriented and have coarse-grained omphasite porphyroblastes. The other type has fine-grained omphasites forming schistosity and lineation. Some eclogites retain eclogite facies mineralgg，and they occur in wide area of the Sebadani area. Therefore there is a possibility that the Sambagawa schist in this area were reached to the eclogite facies P-T conditions．

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