It is the upper of three depth zones of metamorphism, located below the weathered and cemented zones. Metamorphism in this zone is controlled by moderate temperatures, low hydrostatic pressure and high stresses. Rocks from this type of metamorphism are characterized by an abundance of hydrous silicate minerals [Becke: 1903, Grubenmann & Niggli: 1924]. Source: Asakura Publishing Dictionary of Petrology Information |
変成作用の三つの深度帯の上部のもので,風化帯および膠結帯の下部に位置する.この帯の変成作用は中程度の温度,低い静水圧および強い応力に支配される.この型の変成作用による岩石は含水珪酸塩鉱物に富む特徴がある[Becke : 1903, Grubenmann & Niggli : 1924]. 出典 朝倉書店岩石学辞典について 情報 |
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