俄罗斯极地乌拉尔石榴橄榄岩-榴辉岩成因矿物学研究

石榴橄榄岩-榴辉岩是一种出现在造山带中的高压变质岩石组合，虽然在造山带物质中所占比例很小，却记录了造山带形成和演化的重要信息。造山带石榴橄榄岩-榴辉岩可分为两种类型，一种与洋壳俯冲有关，另一种与大陆深俯冲作用有关。因此，其成因研究对认识造山带的构造演化具有重要意义。本项目选择俄罗斯极地乌拉尔Marun-Keu杂岩南端云母山的石榴橄榄岩-榴辉岩为主要研究对象，根据岩石成因就是矿物成因的指导思想，对石榴橄榄岩-榴辉岩中的主要矿物、次要矿物和副矿物进行成因矿物学研究，分析各矿物的结构构造、生长世代、矿物包裹体、主微量元素及同位素组成等，并结合岩石地球化学和同位素年代学资料，查明石榴橄榄岩-榴辉岩形成的温压条件、变质时代和原岩时代及其原岩性质，探讨石榴橄榄岩-榴辉岩的形成过程，为深入认识极地乌拉尔造山带的形成演化提供新的重要的岩石矿物学证据。

Garnet peridotite-eclogite is an association of high-pressure metamorphic rock occurring in orogenic belts, and it records important information of orogenic belt formation and evolution although it represents only a small share of the orogenic belt substances. According to their tectonic setting , the Garnet peridotite-eclogite in orogenic belts can be divided into two types: one related to oceanic crust subduction, and other related to continental deep subduction. Consequently, identification of forming environment and protoliths of the garnet peridotite-eclogite has an important significance for reconstruction evolution of orogen. This research will focus on the garnet peridotite-eclogite from the Mica Mountains in south part of Marun-Keu Complex, Polar Urals, Russia. Base on the idea that minerals record petrogenesis information, the garnet peridotite eclogite will be studied on their genesis of major, minor and accessory minerals , involving structure, growing generation, inclusions, major, trace elements and isotopic compositions of minerals. Combined with geochemistry and geochronology of these rocks, we will determine P-T condition of garnet peridotite-eclogite, timing of eclogitic-facies metamorphism and protolith, reconstruct formation and evolution of garnet peridotite-eclogite. This research will provide new and important petrological and mineralogical evidence for understanding evolution of the Polar Urals orogen.