贺兰山地区前寒武纪变质基底赵池沟岩群的岩石地层特征及形成时代  

Characteristics and formation age of rock group in Zhaochigou Group complex from Early Precambrian metamorphic basement in Helanshan region

作　　者：陆彦俊[1] 周喜文[2] 

机构地区：[1]宁夏国土资源调查监测院,宁夏银川750004 [2]中国地质科学院地质研究所,北京100037

出　　处：《宁夏工程技术》2012年第2期107-109,共3页Ningxia Engineering Technology

摘　　要：阐述了鄂尔多斯陆块西缘贺兰山地区前寒武纪变质基底赵池沟岩群的分布、岩石地层特征,以及与长城纪盖层、吕梁期花岗岩的接触、侵位关系;并从岩石的宏观构造和镜下残余结构分析入手,进行了变质岩的原岩恢复.最后,用锆石U-Pb定年方法,获得火山沉积岩的形成时代为2 047～2 060 Ma,据此判定赵池沟岩群的形成时代为古元古代.The rock group distribution,lithostratigraphic characteristics were described for Ordos block west margin of Helan Mountain region at Zhaochigou Precambrian metamorphic basement,moreover,the contact and emplacement relationships to Changcheng cap and Luliang granite were also described.Using the analyses to macroscopic structure and microscopic residual structure of rock,the work of original rock recovery for metamorphic rock was completed.Finally,using zircon U-Pb dating method to obtain volcanic sedimentary rocks formed in the 2 047—2 060 Ma,and according the determination,Zhaochigou rock group formed in Paleoproterozoic Era.

关 键 词：赵池沟岩群 锆石U-PB定年 古元古代 

分 类 号：P597[天文地球—地球化学]