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东昆仑祁漫塔格地区白垩纪基性岩墙的发现及其意义
Lithogeochemical Characteristics of Cretaceous Basic Dyke Swarm from Qimantag Region in East Kunlun and Its Geological Significance
【摘要】 对东昆仑祁漫塔格地区首次发现的辉绿岩墙群进行了初步的研究,辉绿岩为高TiO2(1.65%2.87%)、高碱(全碱在2.98%5.32%)的碱性玄武岩系列岩石,辉绿岩中采用LAICP-MS锆石U-Pb测年获得了102 Ma的年龄,Sm-Nd等时线年龄为(120±8.3)Ma,从而确定了东昆仑祁漫塔格地区白垩纪基性岩墙群的存在,并可初步确定东昆仑祁漫塔格地区早白垩世处于伸展构造环境。
【Abstract】 The firstly discovered diabase dykes swarm in Qimantag region of East Kunlun has high TiO2(1.65%2.87%)and alkali(2.98%5.32%)contents,belonging to alkalic basalt series.LA-MC-ICP-MS zircon U-Pb dating of diabase dyke(porphyrite)has obtained an age of102 Ma,while its Sm-Nd isochron age is(120±8.3)Ma.Therefore,it’s confirmed that the early Cretaceous diabase dike is existed in Qimantag region,East Kunlun,and the area had entered the intracontinental extension stage in early Cretaceous.
【基金】 中国地质调查局国土资源大调查“1∶25万库郎米其提幅地质调查项目成果”(200113000058);中国地质调查局国土资源大调查“青海1∶5万滩北雪峰地区四幅区调项目成果”(1212010781056)
- 【文献出处】 西北地质 ,Northwestern Geology , 编辑部邮箱 ,2018年02期
- 【分类号】P534.53;P588.12
- 【下载频次】119