论文部分内容阅读
康滇地区混合岩广泛分布于安宁河断裂与金河-箐河断裂之间,其出露面积约4000km~2。混合岩按其形成时间可划分为三类,早元古代深熔混合岩、晚元古代混合岩和燕山期—喜山期混合岩。它的形成与各地质时期的热事件有关,并受一定的构造环境控制。 一、早元古代深熔混合岩 康滇地区前震旦纪变质岩系,厚约30—40km,可分上、下两部分:上部由昆阳群和会理群浅变质砂板岩、碳酸盐岩及火山岩组成,其厚度为10—15km;下部由大红山群细碧角斑岩系、大理岩、混合岩以及角闪岩、麻粒岩组成,其厚度为20—25km,岩石变质程度较
The mixed rocks in Kang-Dian area are widely distributed between the Anninghe fault and the Jinhe-Tiehe fault, with the exposed area of about 4000km ~ 2. According to their formation time, the migmatites can be divided into three types: Early Proterozoic deep-melt mixed rocks, Late Proterozoic mixed rocks and Yanshanian-Himalayan mixed rocks. Its formation is related to the thermal events in various geological periods and is controlled by a certain tectonic setting. First, the Early Proterozoic deep melt mixed rock Kangdian Pre-Sinian metamorphic rocks, about 30-40km thick, can be divided into upper and lower parts: the upper by the Kunyang Group and Huili Group super-metamorphic sand slate, carbonate Salt rock and volcanic rock with the thickness of 10-15km. The lower part is composed of the Emeishan porphyry, the marble, the mixed rock, the amphibolite and the granulite in the Dahongshan group. The thickness of the rock is 20-25km and the rock is degenerated Degree more