南阿尔金尤努斯萨依地区高压变质岩特征及其变质作用  

Characteristics and Metamorphic Processes of High-pressure Metamorphic Rocks in the Younusisayi Area of South Altun Orogenic Belt

作　　者：刘永恒 冯欣 侯红星 LIU Yong-heng;FENG Xin;HOU Hong-xing(Langfang Center for General Survey of Natural Resources,CGS,Langfang 065000,China)

机构地区：[1]中国地质调查局廊坊自然资源综合调查中心,河北廊坊065000

出　　处：《有色矿冶》2024年第5期8-12,共5页Non-Ferrous Mining and Metallurgy

基　　金：中国地质调查局项目(编号DD20160079)。

摘　　要：尤努斯萨依地区位于南阿尔金造山带地处秦-祁-昆造山带西段,通过在本区开展区域地质调查工作,发现出露一套高压花岗质片麻岩。对该高压变质岩的地质特征、岩相学和年代学特征进行了分析,讨论了其变质期次和温压条件,认为该套变质岩显示出榴辉岩、退变质榴辉岩的特征,其原岩形成于800~900 Ma,并在经历了498 Ma的榴辉岩相变质之后,又在453 Ma及其后经历了麻粒岩相和角闪岩相的退变质作用。The Younusisayi area is located in the western section of the Qin Qi Kun orogenic belt in the South Altyn Tagh region.Through regional geological surveys in this area,a set of high-pressure granite gneiss has been discovered.The geological,petrographic,and chronological characteristics of the high-pressure metamorphic rock are analyzed,its metamorphic stages,temperature and pressure conditions are discussed,the result shows that the metamorphic rock exhibits the characteristics of eclogite and retrogressive eclogite.Its original rock was formed between 800 and 900 Ma,and after undergoing eclogite facies metamorphism at 498 Ma,it also underwent retrogressive metamorphism of granulite and hornblende facies at 453 Ma and later.

关 键 词：高压变质岩 变质作用 地质特征 南阿尔金 

分 类 号：P588.3[天文地球—岩石学]