Extension Model of Crustal Uplifting in Western Shandong |
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| Authors: | Yan Shouxun |
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| Institution: | Yan Shouxun,Institute of Remote Sensing Applications,Chinese Academy of Sciences,BeijingWang Guiliang,Shao Zhenjie,China University of Mining and Technology,Xuzhou,Jiangsuand Meng Xiangang Institute ofGeomechanics,Ministry of Geology and Mineral Resources of Chin,Beijing Fei Zhenbi |
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| Abstract: | Block faults, as the -dominant tectonic framwork of western Shandong, were formed by the linked extensional fault system through two extensional movements during the Meso-Cenozoic. Both of the extensional movements experienced the same evloutional process: first, the upper crust was pulled apart to form faults; then the Tai-Lu-Yi (Taishan-Lushan-Yishan) fault block occurring in the footwall of the extensional fault was uplifted, which induced the shallow-level detachment movement along the early Precambrian and Palaeozoic unconformity; the " branching" fault in the upper part of the deep-level detachment layer propagated. As the shallow detachment moved towards the north and the deep one towards the south, the Tai-Lu-Yi fault block acted as the common footwall of both the southern and northern detachment systems. The Tai-Lu-Yi fault block rebounded and uplifted as the overlying material was pulled apart to cause an unloading. Sialic material of the mid-crust below the deep detachment flowed to and accumulated in the free space below the rebounding uplifted body and thickened the body; whereas the mid-crust thinned under the graben systems. The rebounding uplifted body cooled, and then the graben system was occluded, which resulted in the crust-mantle isostatic adjustment and asthenospheric convection. As a result of the two extensional movements, the uplifted central Shandong block with the Tai-Lu-Yi area as the core stands highly above the surrounding plain characterized by graben systems. The present Mount Taishan forms the climax of the uplift. |
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| Keywords: | extensional linked system extensional cycle mantle-derived magma rebounding uplift crustal fluid layer crust-mantle isostatic adjustment |
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