Mesozoic-Cenozoic extension of the Bohai Sea： contribution to the destruction of North China Craton  

作　　者：Guiting HOU K. R. HARI 

机构地区：[1]The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China [2]School of Studies in Geology and Water Resource Management, Pt. Ravishankar Shukla University, Raipur 492010, India

出　　处：《Frontiers of Earth Science》2014年第2期202-215,共14页地球科学前沿（英文版）

基　　金：Acknowledgements Thanks to two anonymous reviewers for thier reviews and constructive comments of our manuscript. We also wish to thank Prof. T. Kusky and Dr. D. Viete fbr their critical suggestions for improving the manuscript. Thanks to editors fur their polishing English. We extend our gratitude towards chief geologist Cai Dongsheng for providing the seismic sections of offshore oilfields. This research was funded by the National Natural Science Foundation of China （Grant Nos, 40772121, 40172066, and 40314141） and State Key Projects （Nos. 2008ZX05029-001 and 201 IZX05029-001 ）.

摘　　要：The Bohai Sea is a Late Mesozoic-Cenozoic feature of the basin-mountain system located in eastern North China Craton （NCC）. The Late Mesozoic thinning of the lithosphere signals the early destruction of the NCC. The onset of the destruction was due to the delamination of thick lithosphere of the craton, represented by the NW- trending grabens in an en-echelon arrangement west to Tanlu Fault, and by the NNE-trending grabens within the Tanlu Fault Zone. The Late Mesozoic NW-trending grabens are overprinted by structures related to the Cenozoic NE-trending pull-apart basin with very thick Mesozoic-Cenozoic sediments in the eastern NCC. C- frequency diagrams of growth faults and the extension factor （fl） of four sections across the basin suggest that the extension migrated from the margin to the center of Bohai Sea, and that the Mesozoic and Cenozoic extension factors for Bohai Sea are higher than that of the margin. These evidences suggest that the greatest extension occurred in the center of Bohai Sea, which is consistent with the thinnest crust being found in the center of the sea. The extension ratios and tectonic evolution of the Bohai Sea suggest that it is the key region for the destruction of the NCC, as evidenced by the topography. However, the NCC experienced two stages of destruction with the late stage related to the tectonic regime of Northeast Asia.The Bohai Sea is a Late Mesozoic-Cenozoic feature of the basin-mountain system located in eastern North China Craton （NCC）. The Late Mesozoic thinning of the lithosphere signals the early destruction of the NCC. The onset of the destruction was due to the delamination of thick lithosphere of the craton, represented by the NW- trending grabens in an en-echelon arrangement west to Tanlu Fault, and by the NNE-trending grabens within the Tanlu Fault Zone. The Late Mesozoic NW-trending grabens are overprinted by structures related to the Cenozoic NE-trending pull-apart basin with very thick Mesozoic-Cenozoic sediments in the eastern NCC. C- frequency diagrams of growth faults and the extension factor （fl） of four sections across the basin suggest that the extension migrated from the margin to the center of Bohai Sea, and that the Mesozoic and Cenozoic extension factors for Bohai Sea are higher than that of the margin. These evidences suggest that the greatest extension occurred in the center of Bohai Sea, which is consistent with the thinnest crust being found in the center of the sea. The extension ratios and tectonic evolution of the Bohai Sea suggest that it is the key region for the destruction of the NCC, as evidenced by the topography. However, the NCC experienced two stages of destruction with the late stage related to the tectonic regime of Northeast Asia.

关 键 词：Bohai Sea EXTENSION PULL-APART lithosphericthinning destruction of craton 

分 类 号：P597[天文地球—地球化学] P534.6[天文地球—地质学]