摘要
辽南韧性剪切带糜棱岩类质量平衡分析表明 ,该剪切带是在一个开放体系非等化学背景下形成的。该带中物质组分的迁移活动 ,主要发生在初糜棱岩—糜棱岩阶段。并以SiO2 的大量迁出 ,TiO2 ,FeO ,MnO ,CaO ,MgO ,P2 O5的显著迁入为特征。以Al2 O3为守恒条件 ,整个剪切带从原岩到糜棱岩的质量和体积发生了 6 74 %～ 7 4 8%损失。
Results of analysis on mylonite mass balance show that ductile sheer zones were fromed by nonisochemical metamorphism in an opening system The gain and loss of components from the ductile shear zones occured mainly in primary mylonite-mylonite stage,which was charaterized by obvious and large input of SiO 2 and output of TiO 2,FeO,CaO,MnO,MgO and P 2O 5 If Al 2O 3 were constant,the total mass and volume of the shear zones should have lost 6 74%-7 48%while the prorolithe changed into mylonite
