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Early Cretaceous Basin Characteristics in the Middle Segment of Yanshanian Stuctural Belt

ZHANG Ying-li1,2, MENG Qing-ren2   

  1. 1. Institute of Mineral Resources, Chinese Academy Sciences, Beijing 100037，China;2. School of Petroleum Resources, Xi’an Shiyou University, Xi’an 710065，China
  • Received:2007-09-26 Revised:1900-01-01 Online:2008-07-26 Published:2008-07-26
  • Contact: ZHANG Ying-li

Abstract: There were three Early Cretaceous basins（Luanping Basin，Fengshan Basin and Shirengou Basin） in the middle segment of Yanshanian stuctural belt. According to sedimentary facies analysis, paleo-current directions, provenance and tectono-sedimentary evolution, the Early Cretaceous basin evolution in the belt can be divided into three stages. The first stage is featured by vigorous volcanic eruptions and developed Zhangjiakou Formation which consists of acid igneous rock. The second is characterized by extensional subsidence. The third is basin filling stage. During second stage the basins were mainly asymmetric half-graben, which were separately controlled by single fault. Alluvial fan and fan delta are dominated basin marginal areas, while fine-grained lacustrine sediments were well developed in the basin centre. Sediments mainly came from metamorphic basements on the north and/or west, only small proportion from southeastern margin, as indicated by restored paleo-current directions and provenance. Tectonic subsidence and deposition sedimentation were primarily controlled by basin border normal faults. Uplift of basement rocks of the footwall was due to the tilting of border faults and became main provenance areas.

Key words: Yanshanian structural belt, Early Cretaceous, sedimentary process, basin evolution

CLC Number: 

  • P544.5
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