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Wang Zhiping Yang Fengqing (Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074)Zhao Peirong (Petroleum Institute of Yunnan, Guizhou and Guangxi, Kunming 650200)  
The development of geologic history of Qinling orogenic belt was controlled by the relative motion of North China and Yangtze plates.Owing to changes of movment rate and rotatory direction of the two plates in Permian, Middle Qinling rifting at the beginning of Carboniferous were stronger and formed the rift system.The rift centre was situated in Meichuan, Minxian County to Zhagu, Dongchang area of Gansu Province, by two lateral sides of which there were a series of roughly parallel structure-rock facies belts running about NW-SE. They respectively represent rift slopes and shallow sea sheif.Sedimentary sequence and geochemical material suggest that the water was deeper and deeper and the rifting was stronger and stronger in the rift belt.The feature of biogeography shows that the rift plays the part of separating for fauna. Paleomagnetism data give some evidenoce for relative movment of North China and Yangtze plates and rift evolution of Middle Qinling area.The rift continued to Early Triassic and disappeared in Middle Triassic with finally closing of Qinling Sea resulting form influence of Indo-China movement and colliding of North China and Yangtze Plates.
【Fund】: 国家自然科学基金国家自然科学基金
【CateGory Index】: P534
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