Provenance analysis of sandstone of the Upper Carboniferous to Middle Permian in Ordos Basin
Chen Quanhong1, Li Wenhou2, Liu Haowei3, Li Keyong4, Pang Jungang5, Guo Yanqin5, Yuan Zhen5
1 CNOOC Research Center， Beijing 100027 2 Geology Department of Northwest University， Xi'an 710069， Shaanxi 3 Research Institute of Petroleum Exploration and Development, PetroChina，Beijing 100083 4 College of Energy and Environmental Engineering， Yanan University， Yanan 716000，Shaanxi 5 Institute of Oil and Gas Resources， Xi'an Shiyou University，Xi'an 710065，Shaanxi
Abstract：Based on comprehensive study of regional geology， stratigraphic contact relations， sandstone fragment components， heavy mineral and trace elements， the Upper Carboniferous to Middle Permian provenance area for the north Ordos Basin mainly come from recycling orogeny area， and can be divided into three provenance areas that are Wuhai-Yinchuan， Hangjinqi-Dongsheng， Zhungeer-Fugu. But affected by variation provenance and bounded by Hangjinqi-Dongsheng， the distribution of quartz sandstone of Ordos Basin that was derived from Alashan ancient land has obvious west-east trending divisional feature and is mainly distributed in west Ordos Basin， but lithic sandstone that came from Yin Mountains mainly distributed in east Ordos Basin. South and southwest trending source sandstone that came from steady tectonic area and recycling orogeny area are strongly related to the evolution of Qin-Qi orogenic belt， and has the duplex characteristic of activity and stabilization. So the south provenance can be divided into three provenance areas that are Haiyuan and Tongxin-Zhongwei， Pingliang-Guyuan and Huaixian， Yaoxian-Yijun and Fuxian. The catchment area of south and north provenance with NWW trending shoestring extension is located in Huanxian-Fuxian-Xianning area， and the catchment area gradually transfers to south Ordos Basin during Shanxi to He-8 period. Until He-8 period， the west provenance began to supply coarse clastic sediments. In Liuyehe Basin， Zhouzhi， as the outer margin of Ordos Basin， which is the intermontane basin of Qinling orogenic belt and has continuous transitional relationship between them， the Upper Carboniferous to Middle Permian sandstone came from recycling orogeny area and continental blocks.
Chen Quanhong,Li Wenhou,Liu Haowei et al. Provenance analysis of sandstone of the Upper Carboniferous to Middle Permian in Ordos Basin[J]. JOPC, 2009, 11(6): 629-640.
