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Magma mixing of granites at Lianghe: In-situ zircon analysis for trace elements, U-Pb ages and Hf isotopes

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Abstract

In this paper, we report an integrated study of trace element, U-Pb age and Hf isotopic composition of zircons from alkali feldspar granites, granodiorites and diorite enclaves in a recently discovered ring complex at Lianghe in western Yunnan, China. The granitoids showed identical U-Pb ages of 127, 115 and 122 Ma, from felsic to mafic, but had different zircon trace elements and Hf isotopic compositions. Trace element content decreased with a gradual increase in ɛ Hf(t) values of −9.1 to −5.4, −4.5 to 0, and 3.6 to 6.2, respectively. Results indicate that changes in zircon trace elements generally correlate with changes in Hf isotope signatures within single samples and among various granitoids. These relationships reflect the mixing of felsic and mafic magmas. Evidence indicates that depleted mantle-derived mafic magma underplating caused ancient crustal melting, and then formed large-scale granites in Lianghe during the Early Cretaceous. These granodiorites were formed mainly by the mixing of mafic magma and granitic magma.

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Authors and Affiliations

  1. Chengdu Center of China Geological Survey, Chengdu, 610081, China

    Feng Cong, ShiLiang Lin, GuangFu Zou, ZaiHui Li, Tao Xie & ZhiMin Peng

  2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China

    Ting Liang

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  1. Feng Cong
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  3. GuangFu Zou
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  4. ZaiHui Li
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  7. Ting Liang
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Correspondence to Feng Cong.

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Cong, F., Lin, S., Zou, G. et al. Magma mixing of granites at Lianghe: In-situ zircon analysis for trace elements, U-Pb ages and Hf isotopes. Sci. China Earth Sci. 54, 1346–1359 (2011). https://doi.org/10.1007/s11430-011-4208-z

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  • DOI: https://doi.org/10.1007/s11430-011-4208-z

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