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DISCUSSION ON MESOZOIC BASIN PATTERNS AND EVOLUTION IN THE EASTERN NORTH CHINA BLOCK

WU Zhiping, HOU Xubo and LI Wei(Institute of Geo-resource and Information,China University of Petroleum, Dongying, Shandong 257061, China)  
The Mesozoic basin evolution in the eastern North China Block was controlled by both the compression and amalgamation between the Eurasian plates and the Paleo-Pacific oceanic subduction and collision with the Eurasian Continent, and was closely related to the formation and evolution of deep faults (e.g., the Tancheng-Lujiang fault zone) and intracontinental and peripheral orogens including the Hinggan-Mongolian orogen, Qinling-Dabie orogen, Taihang uplift and so on. During early to middle Triassic, there possibly existed a NWW-trending large-scale sedimentary basin across the North China Block. This basin was inherited from the structural style and sedimentary characteristics of the Late Hercynian. The topography was high in the northwest and low in the southeast. The compressional amalgamation between the Yangtze and North China Blocks in a scissors-shape pattern during late Triassic, leading to the heterogeneous uplifting of the North China Block, i.e., the extent of uplift was less in the west than that in the east. The scope of basin was shrunk to the west, and the eastern part became a source provenance for erosion and denudation. Since early or middle Jurassic, the eastern part of North China Block was in the transition from the Paleo-Asian tectonic domain to the Paleo-Pacific tectonic domain. Formation of the Taihang Mountain divided the North Chima Block into two large-scale basins. In the west was the Ordos basin, whereas the eastern one comprised a series of small intermontane basins in the Bobai Bay area at the early stage. The structural styles included the Indosinian thrust faults and gentle folds. At the late stage, the sediments were widely dispersed. From Late Jurassic to Early Cretaceous, the influence caused by the Paleo-Pacific plate motion was predominant over the tectonic evolution of the North China Block, leading to formation of large-scale rifts or faulted basins. For instance, along the east of Yanshan-Qikou-Lankao-Liaocheng fault system there occurred a series of NW-and NWW-trending rift basins in response to the sinistral strike-slip stress field of the Tancheng-Lujiang fault zone. Between this fault zone and the Taihang Mountain there developed several NE-and NNE-trending rift basins due to the diminishing of the sinistral strike-slip stress field. Within the Tancheng-Lujiang fault zone, NNE-trending slip-extensional basin was formed as a result of extensional stress field, e.g., the Xialiaohe Depression. In late Cretaceous, the areas to the west of the Tancheng-Lujiang fault zone were uplifted and denuded, with deposition of red fluvial-lacustrine sediments in a few basins, such as the Xinyang basin, Jizhong Depression, Linqing Depression and Huanghua Depression.
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