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《EARTH SCIENCE》 1995-05
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APPLICATION OF ISOTOPIC MAPPING AND CHEMICAL GEODYNAMICS TO STUDYING THE EAST QINLING OROGENIC BELT

Zhang Benren; Zhang Hongfei; Xu Jifeng;Ling Wenli;Ouyang Jianping; Han Yinwen (The Laboratory of Crust-Mantle Constitution ,Recycling and Dynamics,Ministry of Geology and Mineral Resources,China University of Geosciences,Wuhan 430074)  
This paper summarizes the preliminary experienoe in our recent study of the East Qinling Orogenic Belt on isotopic mapping and chemical geodynamics with several successful examples. The contents include:(1)determining the difference in chemical and isotopic (Nd and Pb)compositions of the mantle-and crust-derived rocks and in the crust -mantle evolution between the North China and Yangtze cratons,(2)geochemical evidence for classifying the Proterozoic basement of the South Qinling belt to the Yangtze tectonic-geochemical province;(3)revealing the Dupal type of Pb isotopic composition of the ophiolites in the East Qinling and the similarity of the Qinling ophiolites in Pb isotopic features to the ophiolites in the Sanjiang area being part of the paleotethys,(4)geochemical evidence for inferring the Proterozoic basement of the North Qinling belt probably to be an ancient oceanic island ,amicrocontinent;(5)geochemically proving subduction of the ancient Qinling oceanic crust during the Neoproterozoic and the Early Paleozoic times,and the crust-mantle recycling at the subduction zone;(6)geochemical evidence provided by the study of source of the collision type granitic magma for directly affirming the subduction of the margin of Yangtze continental block (South Qinling belt) beneath the margin of North China continental block(North Qinling belt )during the continent -continent collision.Theseachievements indicate that isotopic mapping and chemical geodynamics are significant and perspective approaches to researches on orogenic belts.
【Fund】: 国家自然科学基金
【CateGory Index】: P623
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