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《Chinese Journal of Geophysics》 2001-01
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DEEP FEATURES OF CONTINENTAL COLLISION BELTS IN NORTHWESTERN CHINA AND THEIR DYNAMIC IMPLICATIONS

XU YI LIU FU TIAN LIU JIAN HUA CHEN HUI SUN RUO MEI (Institute of Geology & Geophysics,Chinese Academy of Sciences,Beijing 100101,China) [  
Possible colliding types between orogenic belts and adjacent blocks are recognized in northwestern Chinese continent by analyzing the deep frames of the lithosphere and asthenosphere of continental blocks,based on the results of seismic tomography. Several tectonic patterns,such as the embedding, subducting,detaching and lateral inserting of continental lithosphere,are observed between the Tianshan and Tarim regions. Sharp deep boundaries exist between the Qinghai Xizang Plateau and its northern geological provinces,showing the evidences of upper mantle flowing to north. It is inferred that the lithosphere of the Qinghai Xizang Plateau has been flexed or broken in the northward moving process,resisted by the rigid Tarim block. Nevertheless,the shallower asthenosphere north of the Qilian mountain seems to be a free boundary,which makes the upper mantle substances beneath the plateau transporting northward much further. Continental collision not only changed the lithospheric structure of the orogenic belts in western China,but also resulted in the mantle upwelling from asthenosphere to the base of lithsophere along the colliding boundary. They have played a key role in the evolution of the plateau and other orogenic belts in western China. [
【Fund】: 国家自然科学基金项目!(494 74 2 1 4 )
【CateGory Index】: P542
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