豆荚状铬铁矿中PGM和BMS形成机理研究

豆荚状铬铁矿中PGM（Platinum Group Mineral）、BMS（Base-Metal Sulfide）和铂族元素合金形成机理的研究是前沿科学问题。本项目拟对比研究赋存在与古亚洲洋演化相关蛇绿岩中的新疆萨尔托海和内蒙古贺根山豆荚状铬铁矿。通过研究这两个铬铁矿矿床中PGM、BMS以及铂族元素合金的形成机理，探索豆荚状铬铁矿成矿作用及其地球动力学意义。与萨尔托海铬铁矿中普遍发育PGM的特征不同，贺根山铬铁矿中罕见PGM和铂族元素合金。对比研究贺根山与萨尔托海铬铁矿的地球化学特征以及包体（金云母、辉石、角闪石、PGM等）的矿物学和地球化学特征，探索母岩浆性质及其演化过程，查明PGM、BMS以及铂族元素合金的形成机理，探索豆荚状铬铁矿的成矿作用及其地球动力学意义。

Research regarding forming mechanisms of Platinum Group Mineral (PGM), Base-Metal Sulfide (BMS), and platinum metal alloys in podiform chromitite is frontier scientific issues. This project is going to study podiform chromitites hosted by the Sartohay ophiolitic mélange in north Xinjiang and a similar podiform chromitites hosted by the Hegenshan ophiolitic mélange in east Inner Mongolia. Both chromitites are located in the ophiolitic belts related with the evolution of Paleozoic Central Asian Ocean. Studies on the forming mechanism of PGM, BMS and metal alloys found in these chromitites would provide a window to discuss genesis of podiform chromitites as well as their related ophiolitic mélanges. The Sartohay chromitites contain abundant PGM and metal alloys, which are rarely found in the Hegenshan chromitites. Both the Sartohay and Hegenshan chromitites contain abundant silicate mineral inclusions such as phlogopite, clinopyroxene, orthopyroxene, amphibole, ilmenite etc. Comparably study on mineralogy and geochemistry of these chromitites and their mineral inclusions would greatly promote the research on the evolution of chromitite-related magmas. Deciphering the forming mechanism of PGM, BMS and metal alloys. Combining the forming mechanism of PGM, BMS, and metal alloys and ore-formation processes provides powerful tools to reveal ore-forming processes of podiform chromitites and their geodynamic significance.