内蒙古白音图嘎地区青克勒组地层时代及地质意义

Stratigraphic Age and Geological Significance of Qingkele Formation in Baiyintuga Area,Inner Mongolia

青克勒组地层时代归属一直存在较大争议,为进一步厘清该组地层时代,结合相关工作成果,对白音图嘎地区青克勒组进行了调查研究。分别从地层划分、岩石地层特征、沉积相和沉积环境以及岩石地球化学特征等方面讨论了区内青克勒组地层特征,在此基础上,经岩石地层对比、生物地层研究、青克勒组与岩浆岩关系讨论,证明青克勒组地层时代为三叠纪,该区一直无中晚二叠世—三叠纪的沉积记录,被认为是挤压和隆起状态。大兴安岭南段三叠系的发现,为研究三叠纪地质历史提供了重要依据。

Great dispute about the stratigraphic age of Qingkele formation is existed at present,in order to clarify the stratigraphic age of Qingkele formation,combing with some related working results,the Qingkele formation in Baiyintuga area is investigated and studied. The stratigraphic characteristics of Qingkele formation is analyzed from the aspects of the stratigraphic division,rock stratigraphic characteristics,sedimentary facies and sedimentary environment,and rock geochemical characteristics. According to the above analysis results,based on the discussion results of rock stratigraphic correlation,biostratigraphic study and the the relationship between Qingkele formation and magmatic rock show that the stratigraphic age of Qingkele formation is Triassic,the middle-late Permain-Triassic sedimentary records are not existed in the Baiyintuga area,which indicated that the Qingkele formation is in the extrusion and swell states.Besides that,the Triassic formation of the south section of Greater khingan Mountains is found,which can provide some important reference for the study of geological history of Triassic.