西昆仑新藏公路118～323km段基性、酸性岩脉K—Ar年龄

[1]中国地质大学地球科学与资源学院，北京100083／／陕西省地质调查院，陕西成阳712000 [2]北京大学地球与空间科学学院，北京100871 [3]中国地质大学水资源与环境学院，北京100083

基金项目: 国家自然科学基金项目(49902020)，中国地质调查局1∶25万区域地质调查项目(基2002001-18)资助。

K-Ar ages of basic-acid dikes of the 118-323 km section of the Xinjiang-Tibet Highway in the West Kunlun

College of Earth Sciences and Land Resources,China University of Geosciences,Beijing 100083,China,2. College of Earth and Spatial Science,Peking University,Beijing 100871,China,3. Shaanxi Institute of Geological Survey,Xianyang 712000,Shaanxi,China,4. College of Water Resources and Environment,China University of Geosciences,Beijing 100083,China

摘要: 在西昆仑西段新藏公路沿线广泛发育数量众多的岩脉，野外出露有煌斑岩脉、辉绿岩脉、闪长岩脉、花岗岩脉。对以上岩脉进行了全岩K-Ar同位素测年，其侵位年龄与该区的地质构造事件有很好的对应关系：辉绿岩脉273～280Ma的侵位年龄对应着弧后扩张的时间，闪长岩脉和花岗岩脉230～244Ma的侵位年龄对应着碰撞造山的时间。
- 西昆仑 /
- 岩脉 /
- K-Ar同位素测年
Abstract: Many dikes occur along the Xinjiang-Tibet Highway in the western segment of the West Kunlun. Those exposed in the field are lamprophyre, diabase, diorite and granite dikes. Whole-rock K-Ar dating of these dikes indicates that their emplacement ages may well correspond with tectonic events in the study area. The 273-280 Ma age of emplacement of diabase dikes corresponds with the timing of back-arc spreading and the 230-244 Ma age of emplacement of diorite and granite dikes corresponds with the timing of collisional orogeny.
- West Kunlun /
- dike /
- K-Ar dating