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《Chinese Geology》 2003-03
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Depositional systems and evolution of the Touchengzi Formation in the Pingquan area,Hebei

JIA Jian-cheng1,SUN Li-xin2,ZHANG De-sheng1,LU Yan-ming1,ZHAO Wei-ying1(1.Regional Geology and Mineral Resources Survey Institute of Hebei Province,Langfang,Hebei065000;2.China University of Geosciences,Beijing100083)  
The Middle Jurassic Formation in the Pingquan basin is a very thick sequence of red detrital rocks formed under inland dry climatic conditions.From below upward the sequence can be divided into four lithological members;the first member at the base is mainly marked by an alluvial fan depositional system,the second member is a lake depositional system,the third member is a river system,and the fourth member is a composite alluvial fan and river system.The above filling sequence reflects that at the time of deposition of the Tuchengzi Formation the basin experienced three evolutionary stages,i.e.:incipient subsidence,lake basin spreading and basin contraction.
【Fund】: 国土资源部1∶5万平泉县幅、杜岱营子幅、榆树林幅区域地质调查项目资助。
【CateGory Index】: P512.2
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