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《中国科学D辑(英文版)》 1996-S1
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Late Paleozoic sedimentation and tectonics of rift and limited ocean basin at southern margin of the Qinling

MENG Qingren(Institute of Geophysics. Chinese Academy of Sciences. Beijing 100101, China)ZHANG Guowei , YU Zaiping and MEI Zhichao(Department of Geology, Northwest University, Xi'an 710069, China)  
The rifting and occurrence of limited oceanic basin at southern margin of Qinling separated south Qinling from Yangtze Block in late Paleozoic. Detailed sedimentary studies were carried out at two localities at southern flank of this rift-limited oceanic basin zone. and depositional architectures were then established accordingly. The results show that tectono-sedimentary stories are differing in different positions but clearly demonstrate spatial development of the rift. It is obvious that the rift in west part of Mianlue underwent two developmentary phases, early rapid subsidence and late slow subsidence, and there occurred breakup unconformity between the seccessions of the two subsidence phases. Combined with the data of structural, geochemical and chronological studies on the ophiolitic complex within the Mianlue zone. it is demonstrated that the rifting-drifting transition occurred, leading to the development of limited oceanic basin during the late Paleazoic. Spatial and temporal evolution of the rift-limited oceanic basin zone am be well correlated with Paleo-Tethyside, indicating their genetic linkage.
【Fund】: Project supported by the National Natural Science Foundation of China.
【CateGory Index】: P512.2
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