青海省达卡地区三叠系巴颜喀拉山群极低级变质作用  

Very Low-grade Metamorphism of the Triassic Bayankara Group in Dhaka,Qinghai Province

作　　者：孙占营 王瑜 敬乐 赵相国 SUN Zhan-ying;WANG Yu;JING Le;ZHAO Xiang-guo(Northwest Sichuan Geological Team,Mianyang 621000,China;Mianyang BOE Optoelectronics Co.,Ltd.,Mianyang 621000,China)

机构地区：[1]四川省地质矿产勘查开发局川西北地质队,绵阳621000 [2]绵阳京东方光电科技有限公司,绵阳621000

出　　处：《价值工程》2020年第12期206-207,共2页Value Engineering

摘　　要：通过区域地质调查,利用X射线粉晶衍射分析确定了青海省达卡地区三叠系巴颜喀拉山群极低级变质岩的共生组合和伊利石结晶度指数,并根据伊利石结晶度Kübler指数对其变质作用的类型进行了研究和分带,将三叠系巴颜喀拉山群甘德组划归为低级近变质带(K.IΔ2θ°为0.40),将三叠系巴颜喀拉山群清水河组划归为成岩带(K.IΔ2θ°为0.42~0.77)。Based on the regional geological survey and X-ray powder diffraction analysis,the intergrowth assemblage and illite crystallinity index of the very low-grade metamorphic rocks of the Triassic Bayankara group in Dhaka area,Qinghai Province are determined,and the types of metamorphism are studied and zoned according to the illite crystallinity Kübler index.The Gande formation of the Triassic Bayankara group is classified as the low-grade near metamorphic belt(K.IΔ2θ°is 0.40).The Qingshuihe formation of the Bayankara group of Triassic is classified as diagenetic belt(K.IΔ2θ°is 0.42-0.77).

关 键 词：青海达卡地区 巴颜喀拉山群 伊利石结晶度 极低级变质作用 

分 类 号：P587[天文地球—岩石学]