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| GEOCHEMICAL CHARACTERISTICS OF YUNLING GRANODIORITE IN THE DAMAIDI Sn ORE DISTRICT, SOUTHWEST YUNNAN |
| ZHANG Xiao-yong1,2, PENG Run-min1, LI Zhong-lie2, LUO Ping-hui2, LI Jing-wen2, YI Ai-wen3 |
1. School of Earth Sciences and Resource, China University of Geosciences, Beijing 100083, China;
2. Henan Institute of Non-ferrous Metal Explorat- ion, Zhengzhou 450052, China;
3. No. 7 Geological Party, Henan Bureau of Geology and Nonferrous Metals Mineral Resources, Zhengzhou 450018, China |
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Abstract Geochemical characteristics of Yunling granodiorite in the Damaidi Sn ore district were studied in this paper. SiO2 content varies in the range of 60.25%~66.44%, 64.41% on average; K2O content is 0.37%~4.39%, 3.07% on average; wK2O+wNa2Ocontent is 3.44%~11.47%, 5.92% on average. ACNK of the rock is 2.62 on average. The granodiorite belongs to the high-K calc-alkaline and aluminum saturation series, characterized by the depletion of Nb, Ta, Sr, P, Zr and Hf. Based on trace elements diagrams, the authors found that there exist obvious magmatic differentiation and negative Eu anomaly, suggesting that Yunling granodiorite belongs to syncollision granite.
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Received: 20 July 2011
Published: 10 August 2012
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