地质与资源2017，Vol.26Issue(5)：439-444,6.
浅谈内蒙古大兴安岭地区中南部侏罗系与白垩系之界线
DISCUSSION ON THE BOUNDARY BETWEEN JURASSIC AND CRETACEOUS IN SOUTH-CENTRAL DAXINGANLING REGION, INNER MONGOLIA
摘要
Abstract
By discussion on the unconformity between Jurassic and Cretaceous in the south-central Daxinganling region,combining with regional stratigraphic correlation and isotope data,the boundary with identifiablity,objectivity and stability is determined.With study on the geotectonic setting for the forming of major strata,it is believed that the Tuchengzi Formation is a set of continental redbeds formed in the collision of post-orogenic extensional tectonic stage and is also the marker bed of the end of Jurassic,while Manketouebo Formation,Manitu Formation and Baiyingaolao Formation are volcanic strata formed in the post-collisional orogenic collapse tectonic stage.The Cretaceous crustal evolution begins with massive volcanic eruptions.The boundary of Jurassic and Cretaceous is between the Tuchengzi Formation and Manketouebo Formation,which is characterized by regional unconformity or disconformity.The unconformity surface is formed in the transition period from extension to collapse of post-collisional orogeny tectonic background.关键词
J-K界线/土城子组/满克头鄂博组/不整合面/假整合/大兴安岭地区Key words
J-K boundary/Tuchengzi Formation/Manketouebo Formation/unconformity surface/disconformity/Daxinganling region分类
天文与地球科学引用本文复制引用
曲洪祥,张磊,陈泽翰,徐桓,龚全德,杜士澍,高文勃,仲米山,谭超,王一树,吴昊..浅谈内蒙古大兴安岭地区中南部侏罗系与白垩系之界线[J].地质与资源,2017,26(5):439-444,6.基金项目
中国地质调查局“内蒙古1∶5万复兴屯(L51E012003)等四幅区矿调”项目(1212011504190),“1∶5万特莫牧场(L51E009003)等四幅区矿调”项目(DD2016007804),“1∶5万明水河林场(L51E008004)等三幅区调”项目(12120114013001). （L51E012003）
