摘要
峨山口韧性剪切带糜棱岩质量分析结果表明，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，主要发生在白云母石英片岩的形成阶段，并以Ｌｏｓ（流体）、ＳｉＯ２、ＦｅＯ、Ｆｅ２Ｏ３、ＴｉＯ２、Ｋ２Ｏ大量带入，而Ｎａ２Ｏ显著带出为特征。以Ａｌ２Ｏ３守恒为限制条件，整个剪切带从原岩到白云母石英片岩的质量和体积增大约５０％。
The results of mylonite mass balance analysis show that the Eshankou ductile shear zone was formed by nonisochemical metamorphism in an opening system. The gain and loss of components occurred mainly in the tectonic muscovite quartz schist stage, which was characterized by the introduction of large amounts of LOS (fluid), SiO 2, Fe 2O 3, FeO, TiO 2 and K 2O and obvious removal of Na 2O. Al 2O 3 was kept at a constant. The entire shear zone gained about 50% of mass and volume when the protoliths changed to muscovite quartz schist.
出处
《中国区域地质》
CSCD
1998年第2期149-155,共7页
Regional Geology of China
基金
地矿部"八五"区域地质调查项目
关键词
峨山口
韧性剪切带
构造片岩
质量平衡
糜棱岩
Eshankou ductile shear zone, tectonic schist, mass balance, Yishu fault belt
