Active mode of the Tan-Lu fault zone in Early Cenozoic
Xu Qinqin1, Ji Jianqing1, Wang Jinduo2, Wang Zhenlan1, Han Wengong2, Yu Jianguo2
1. Key Laboratory of Orogenic Belts and Crustal Evolution in Ministry of Education, Peking University, Beijing 100871; 2. Institute of Geophysical Exploration of Shengli Oilfield Company Ltd., China Petroleum and Chemical Corp., Dongying, Shandong 257022
The Tan-Lu fault zone, which played a key role in tectonic evoluiton of East China continent during Cenozoic, and controlled the formation and deformation of the large basins and their evaluation of petroleum resource, was one of the most important tectonic belts in eastern marginal areas of Asia. According to the geometrical features, the latest seismic reflection profiles and field survey, the paper considered that the Tan-Lu fault zone had undergone intense movement in Early Cenozoic, revealed by sinistral strike-slipping as well as thrusting. Based on the analysis of deformed Cretaceous covered by undeformed volcanic rocks in age of Neogene, and the relation between the fault and cover strata in seismic reflection profiles, it was thought that the Tan-Lu fault zone was not mobile remarkably from Miocene or Dongying Movement in area of the Bohai Bay Basin, since the tectonic stress field changed obviously. The strike-slipping, with oblique thrusting, of the Tan-Lu fault zone in Early Paleogene, founded the tectonic framework of creation and deformation of the sedimentary basins, and formation and secondary generation of hydrocarbon reservoirs of Cenozic in East China.