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Ages and geochemistry of Laojunshan granites in southeastern Yunnan, China: implications for W-Sn polymetallic ore deposits

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Abstract

The Southeastern Yunnan region is one of the most important polymetallic ore districts in South China. Located in the southern margin of the South China Block, these ore districts are part of a wider granite-related magmatic-hydrothermal system. Laojunshan granite intrusions, located in the western part of the Southeastern Yunnan, are closely related to W-Sn mineralisation. In this paper we report zircon U-Pb ages, geochemical and petrological characteristics for the ore-related granites in Laojunshan area. Three samples from three intrusive suites of the granitic rocks in Laojunshan intrusion have been analyzed by the LA-ICPMS zircon U-Pb techniques, yielding ages of 86.66 ± 0.42 Ma, 86.72 ± 0.47 Ma and 86.02 ± 0.48 Ma, respectively. Bulk analysis reveals that three intrusive suites are strongly-peraluminous, silica-rich, aluminum-rich and alkali-rich granites and their ACNK values fall mainly into a small range of 1.10–1.38. Moreover, all granites show enriched Rb, La and Zr and depleted Ba, Sr and Ti, as well as a uniformly flat REE-pattern with a marked negative Eu anomaly. The granites and polymetallic W–Sn mineralization possibly both occurred during the Late Coniacian.

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Acknowledgments

This research was jointly supported by the National Natural Science Foundation of China (No.40930419) and Geological Survey Project (1212010634001), the Projects 2007CB411405 and 2007CB411407 of the State Key Fundamental Program. We thank Yunman Zhou and his colleagues from the Yunnan Geology and Mineral Resources Co., Ltd. for providing invaluable assistance during our field investigations. We are grateful to Guixing Xie, Maohong Chen and Yanbo Cheng for their constructive discussions, which considerably improved the paper. Thanks are given to Prof. Franco Pirajno and another anonymous reviewer for constructive reviews. We are grateful to Dr. Andreas Moeller for patient and meticulous work.

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  1. MLR Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, People’s Republic of China

    Jiarui Feng, Jingwen Mao & Rongfu Pei

  2. Research Institute of Petroleum Exploration Development (RIPED), Petroleum Geology Research and Laboratory Center (PGRL), Beijing, 100083, People’s Republic of China

    Jiarui Feng

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Feng, J., Mao, J. & Pei, R. Ages and geochemistry of Laojunshan granites in southeastern Yunnan, China: implications for W-Sn polymetallic ore deposits. Miner Petrol 107, 573–589 (2013). https://doi.org/10.1007/s00710-012-0253-3

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