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《Journal of Stratigraphy》 2003-01
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REVISION OF THE MIDDLE AND UPPEF JURASSIC DAQINGSHAN FORMATION IN DAQINGSHAN AREA, INNER MONGOLIA

PENG Xiang-dong, XU Zhong-yuan, and LIU Zheng-hong (College of Earth Science, Jilin University, Changchun, 130061)  
The Jurassic strata in the Daqingshan area are completely developed.The Lowper-Middle Jurassic Wudanggou Formation is composed of coal-bearing clastic sediments, the Middle Jurassic Changhangou Formatin consists of grey-green silty and fine sandstone intercalated with sandy conglomerate and marl, and the Middle-Upper Jurassic Daqingshan Formation is made up of purple clastic rock series, forming a complete evolutionary series of basin. Because the Mesozoic thrust nappes within this area are structurally very well developed, the strata of different ages within this area are all superimposed on each other like tectonite, rendering it very difficult to divide and correlate the strata. Most of the Middle-Upper Jurassic Daqingshan Formation defined in the past are not the Daqingshan Formation and belong to the Upper Permian Naobaogou Formation and the Lower Cretaceous Lisangou and Guyang Formations. Based on a great number of field investigations the stratigraphic sequence, developmental and distribution laws and the contact relationship with the underlying strata are collated and stipulated by the authors, who suggest that the Upper Jurassic Daqingshan Formation in the Daqingshan area is composed of fluviolacustrine sediments deposited in a dry and hot condition, with organisms being poor, distribution being controlled by the Bayan-Ximanwan-Jinluandian fault, a part being unconformable with the underlying strata, and an entirety being pseudoconformable. These conclusions are of important significance in the division and correlation of the strata within this area and the study of the geological evolutionary history.
【Fund】: 国土资源部地调局内蒙古大青山地区 6幅 1/5万区域地质调查项目 ( 0 1992 0 90 31);; 内蒙古 1/2 5万《包头市幅》区域地质调查项目 ( K49C0 0 40 0 2 )
【CateGory Index】: P534.52
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