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Weng W.-F.,332 Geological Team of Anhui Bureau of Geology and Mineral Exploration | Zhi L.-G.,332 Geological Team of Anhui Bureau of Geology and Mineral Exploration | Cai L.-Y.,332 Geological Team of Anhui Bureau of Geology and Mineral Exploration | Xu S.-F.,332 Geological Team of Anhui Bureau of Geology and Mineral Exploration | Wang B.-M.,332 Geological Team of Anhui Bureau of Geology and Mineral Exploration
Bulletin of Mineralogy Petrology and Geochemistry | Year: 2011

More than 40 Yanshanian granites are distributed in south Anhui and surrounding area, and ages of these granites can be classified into two stages- the first stage belongs to J 3-K 1 1 , 130∼170 Ma with an average age of 145 Ma, and the second stage belongs to K 1 2, 109∼132. 2Ma with an average age of 123. 5 Ma. The analysis of penological and geochemical characteristics shows that the granodiorites of J 3-K 1 1 in south Anhui and vicinities are C type, high-K calc-alkaline adakite(HKCAA) , formed from partial melting of the thickened lower crust by delamination in Mesozoic in eastern China. The analysis of geochemical characteristics of the granites in K 1 2 shows that they are A2-type granites, formed in extensional environment after orogeny, resulting from partial melting of andesitic crust after the formation of adakite. In addition, a close relationship exists among adakite, porphyry copper and multi-metal deposits, and A-type granite plays a important role in the enrichment of rare earth elements, such as, W, Zr, Nb, Ta, U and so on. Therefore, thorough researches on adakite and A-type granite in south Anhui and vicinities will provide new ideas and directions for the exploration of porphyry copper, rare earth element and rare metal deposits.

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