Coupling Relationships of Sedimentary Basin-Orogenic Belt Systems and Their Dynamic Models in West China--A Case Study of the Longmenshan Orogenic Belt-West Sichuan Foreland Basin System
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P542

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    Abstract:

    Orogenic belts and sedimentary basins are twins developed in a geodynamic system, which formed a sedimentary basin-orogenic belt system. A sedimentary basin-orogenic belt system is a complex system formed by the interactions of continental blocks and the coupling of different spheres in the lithosphere, both of which are substance cycling systems and energy exchanging systems. The coupling relationships between sedimentary basins and orogenic belts refer to all of their interactions in their formation and evolution. Sedimentary basin-orogenic belt systems are characteristic of the basic Mesozoic-Cenozoic structural pattern in West China. There are two fundamental types of sedimentary basin-orogenic belt systems in West China, i. e. simple-flank-basin sedimentary basin-orogenic belt system and double-flank-basin sedimentary basin-orogenic belt system. Microcontinental amalgamation, multi-cycle tectonic movements and intensive intracontinental tectonic activities are the main geologic setting of the formation and evolution of sedimentary basin-orogenic belt systems in West China. The coupling relationships of sedimentary basin-orogenic belt systems include: (1) enantiomorphous relationship between the uplifting of orogenic belts and the vertical subsiding of sedimentary basins, (2) bi-direction transfer of substance flow and energy flow in the horizontal direction, and (3) intensive interactions between different spheres of the lithosphere. The coupling relationship dynamic model of the sedimentary basin -orogenic belt systems in West China is a C (intracontinental)-subduction, which is an L (Longmenshan)-subduction for the simple-flank-basin sedimentary bain-orogenic belt systems and T(Tianshan)-subduction for the double-flanks-basin sedimentary basin-orogenic belt systems.

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LIU Shugen, LUO Zhili, ZHAO Xikui, XU Guosheng, WANG Guozhi, ZHANG ChengjiangState Key Laboratory of Oil, Gas Reservoir Geology, Exploitation, Chengdu University of Technology, Chengdu,.2003. Coupling Relationships of Sedimentary Basin-Orogenic Belt Systems and Their Dynamic Models in West China--A Case Study of the Longmenshan Orogenic Belt-West Sichuan Foreland Basin System[J]. Acta Geologica Sinica,77(2):177-186

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  • Received:
  • Revised:January 07,2002
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