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《Geology and Exploration》 2011-06
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Geochemical Characteristics of Granite in the Guanfang Tungsten Deposit of Wenshan,Yunnan Province and Its Geological Implications

ZHANG Ya-hui,ZHANG Shi-tao (Faculty of Land Resource Engineering,Kunming University of Sciences and Technology,Kunming, Yunnan 650093)  
Petrologic and geochemical analysis for granites from the Guangfang tungsten deposit of Wenshan, Yunnan Province shows that their average contents of SiO2,Na20 and K2O are 68.49%,2.38%,and 4.26%, respectively. The average Rittmann index is 2.33. Trace elements of Nb, Ta, and Y are enriched while Sr and Ba are depleted. The average value of ∑REE is 256.09×10-6. The REE pattern of Guangfang granites is of the enriched type of LREE with pronounced Eu negative anomalies and δEu = 0.62~0.72. It is shown that the granite in Guanfang is characterized by highly-enriched kalium calc-alkaline and belongs to the S-type granite. Major and trace elements imply that the granite in Guanfang was formed in a continental collision tectonic setting. The features of REE indicate that they were derived from the crust. The content of tungsten in the granite is 23.7 times the average content of granite in China. Its high tungsten abundance had accommodated the generation of the Guanfang tungsten deposit in this region.
【Fund】: 校企横向合作项目(619320100047)资助
【CateGory Index】: P618.67
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