内蒙古中西部色尔腾山岩群的厘定及其地质意义  

THE SERTENGSHAN ROCK GROUP IN MIDDLE-WEST INNER MONGOLIA: Revision and its geological significance

作　　者：陈志勇[1] 郑翻身 王忠[3] 李四娃[3] 王富宽 

机构地区：[1]中国地质大学,北京100083 [2]内蒙古地质矿产开发局,内蒙古呼和浩特010020 [3]内蒙古自治区地质调查院,内蒙古呼和浩特010020 [4]内蒙古自治区第一地质矿产勘查开发院,内蒙古呼和浩特010100

出　　处：《地质与资源》2007年第1期1-6,41,共7页Geology and Resources

基　　金：内蒙古巴音诺日公地区4幅1:5万区调;金盆地区4幅1:5万区调;召河庙地区2幅1:5万区调(J5.3.1)

摘　　要：根据近年完成的1∶5万区域地质调查成果及综合研究,将分布于内蒙古中部色尔腾山、大青山、西部乌拉特后旗以及阿拉坦敖包、叠布斯格等地的低角闪岩相—高绿片岩相的片岩、大理岩系厘定为色尔腾山岩群.其特点是整体有序,组内无序,韧性剪切变形强烈.重新厘定后的色尔腾山岩群自下而上划分为4个岩组,即东五分子岩组、柳树沟岩组、北召沟岩组和点力素泰岩组.顶部与中新元古界白云鄂博群、渣尔泰山群不整合接触.根据新的同位素测年资料,色尔腾山岩群的形成时代为新太古代.东五分子岩组是内蒙古中部重要的沉积变质铁矿含矿层位,柳树沟岩组是重要的含金层位.正确厘定色尔腾山岩群的层序对研究华北陆块北西缘新太古代地质构造演化,确认巴音诺日公、狼山地区大地构造归属以及不同地区在相同层位寻找同类型铁、金矿床具有现实意义.Based on the 1：50000 regional geological survey, the Sertengshan rock group is revised, involving the schist and marble of low-amphibolite to high-greenschist facies, which are distributed in middle and west Inner Mongolia. The rock group is characterized by a general order but internal disorder because of intense ductile shearing deformation. The Sertengshan rock group can be divided into four rock formations, i.e. from bottom to top, Dongwufenzi, Liushugou, Beizhaogou and Dianlisutai formation, covered by Meso-Neoproterozoic strata with unconformity at the top. Isotopic data proved that the forming age of the Sertengshan group is Neoarchean. The Dongwufenzi formation is an important Fe-bearing stratum, while the Liushugou formation is a significant stratum for Au deposits in Middle Inner Mongolia. The revision of Sertengshan rock group is significant for the study of Neoarchean tectonic evolvement in the northwestern margin of North China Plate and exploration for iron and gold deposits in the area.

关 键 词：色尔腾山岩群 厘定 意义 内蒙古 

分 类 号：P534.2[天文地球—古生物学与地层学] P534.3[天文地球—地质学]