MESOZOIC THRUSTING OF THE CHENGDAO-KENDONG STRUCTURAL BELT AND ITS RELATION TO THE TAN-LU FAULT ZONE IN JIYANG AREA
Zhang Kexin1, Qi Jiafu1, Lin Huixi2
1. Key Laboratory for Hydrocarbon Accumulation Mechanism, Ministry of Education, China University of Petroleum, Beijing 102249; 2. The Shengli Oilfield Corp., China Petroleum & Chemical Corporation, Dongying, Shandong 257015
The Chengdao-Kendong buried hill belt in the Cenozoic Jiyang Depression was located to the west of the Tan(cheng)-Lu(jiang) fault zone. The belt was once a part of the North China Craton and went through unified evolution process in Paleozoic, and its tectonic development differentiated during Mesozoic. Four seismic profiles revealed that a lot of thrusts occurred in the Mesozoic in Zhuangxi and Chengdao areas. Based on the analyses of the Tan-Lu fault zone’s movements in Mesozoic, the creation of the buried hill belt was discussed. The Tan-Lu fault zone might be an oblique-convergence and shearing orogenic belt during Juro-Cretaceous. Because of its sinistral shearing along the continental margin in Early-Middle Jurassic, the neighboring Kendong area uplifted in that time. The accelerated shearing and intracontinental orogeny in the latest Middle Jurassic and earliest Late Jurassic resulted in the first generation of thrusting in the belt. The Su-Wan Block collided the Jiao-Liao Craton in Late Jurassic and Early Cretaceous, when the western plate of the Tan-Lu fault might be an obducted one and the Chengdao-Kendong areas extended. The Yanshanides collapsed in the latest Early Cretaceous and Late Cretaceous, the Chengdao-Kendong areas were just situated on the shoulder region so that the second generation of thrusting occurred, which created the Chengdao-Kendong structural belt. With formation of the Jiyang Depression in Cenozoic, the belt depressed and became a buried hill belt and separated the Zhanhua Sag from the Huanghekou Sag.
Zhang Kexin,Qi Jiafu,Lin Huixi. MESOZOIC THRUSTING OF THE CHENGDAO-KENDONG STRUCTURAL BELT AND ITS RELATION TO THE TAN-LU FAULT ZONE IN JIYANG AREA[J]. Chinese Journal of Geology, 2006, (2): 270-277,290.