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《Earth Science Frontiers》 2003-03
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MESOZOIC GRANITOIDS FROM NORTH CHINA BLOCK AND QINLING-DABIE-SULU OROGENIC BELT AND THEIR DEEP DYNAMIC PROCESS

HONG Da-wei~1,WANG Tao~1,TONG Ying~1,WANG Xiao-xia~2(1.Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2.Department of Geology, Chang'an University, Xi'an 710054, China)  
Recent studies suggest that the Mesozoic granitoids and the contemporary mafic and ultra-mafic rocks from the North China block and Dabie-Sulu orogenic belt have the similar Sr, Nd isotopic characteristics, and many of the granitoids and volcanic rocks exhibit some features of adakites. Based on these studies and the collected Sr, Nd isotope data, and from the viewpoint of the whole North China lithosphere, we have discussed the nature of the EMI-type enriched mantle, the time and the mechanism of the formation of the enriched mantle, and have further discussed the dynamic mechanism of the magmatism. We suggest that the enriched mantle was caused by the Archean crust-mantle recycling in the setting of a breakup of the Pangea supercontinent, which made the mantle composition changed. Integrating with the data of the global seismic tomography, we have also discussed the significance of lower crust transferred from subducted oceanic relics, and the old craton substance for the source of the granitoids.
【Fund】: 国家 973项目 (2 0 0 1CB40 980 0 ) ;; 国家自然科学基金资助项目 (4 9772 10 5 40 0 72 0 2 3 ) ;; 中国地质调查局项目(2 0 0 113 90 0 0 0 18) ;; 国际合作基金资助项目 (4 0 2 10 64 7)
【CateGory Index】: P588.12
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