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AN EAST CHINA PLATEAU IN MID-LATE YANSHANIAN PERIOD: IMPLICATION FROM ADAKITES

Zhang Qi Qian Qing Wang Erchie Wang Yan Zhao Taiping Hao Jie Guo Guangjun (Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing \ 100029)  
It is reported that some of the felsic igneous rocks of Yanshanian period from the eastern part of China are geochemically analogous to adakites. Based on the genesis of adakites, as well as other geological evidences, the paper is proposing that in Mid Late Yanshanian period the eastern part of China continent was probably a plateau, which was uplifted in Mid Late Jurassic and thinned after Early Cretaceous. The covered areas, mechanism of uplifting and thinning of the plateau are discussed, and it is considered that uplifting and thinning of the plateau were due to intra continental orogenic events and delamination of lower continental crust, respectively. The delamination may be also responsible for the eruption of basalts and formation of basins in the eastern part of China during Cenozoic.
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