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    Petrogenesis and tectonic implications of Late-Triassic high eNd(t)-eHf(t) granites in the Ailaoshan tectonic zone (SW China)

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    Authors
    Liu, H.
    Wang, Y.
    Fan, W.
    Zi, Jianwei
    Cai, Y.
    Yang, G.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Liu, H. and Wang, Y. and Fan, W. and Zi, J. and Cai, Y. and Yang, G. 2014. Petrogenesis and tectonic implications of Late-Triassic high eNd(t)-eHf(t) granites in the Ailaoshan tectonic zone (SW China). Science China Earth Science. 57 (9): pp. 2181-2194.
    Source Title
    Science China Earth Science
    DOI
    10.1007/s11430-014-4854-z
    ISSN
    16747313
    School
    John de Laeter CoE in Mass Spectrometry
    URI
    http://hdl.handle.net/20.500.11937/41350
    Collection
    • Curtin Research Publications
    Abstract

    High eNd(t)-eHf(t) granites are robust evidence for crustal growth. In this paper we report results of petrologic, geochronological and geochemical investigations on the Huashiban granites from the Ailaoshan tectonic zone in western Yunnan (SW China). Zircon grains separated from the two samples (10HH-119A and 10HH-120A) yield the weighted mean 206Pb/238U ages of 229.9 ± 2.0 Ma and 229.3 ± 2.3 Ma, respectively, interpreted as the crystallization ages of the granites. Based on our results, in combination with the existing U-Pb geochronological data for the Ailaoshan metamorphic rocks, we propose that the Ailaoshan Group might be a rock complex composed of the Mesoproterozoic, Neoproterozoic, Hercynian, Indosinian and Himalayan components, rather than a part of the crystalline basement of the Yangtze block. The zircon grains show highly depleted Lu-Hf isotope compositions, with positive ? Hf(t) values ranging from 8.4 to 13.1. The Huashiban granites have high SiO2 (72.66 wt%–73.70 wt%), low Mg# (0.28–0.34) with A/CNK=1.01–1.05, and can be classified as peralumious high-K calc-alkaline I-type granites. A synthesis of these data indicates that the Ailaoshan tectonic zone had evolved into a post-collisional setting by the Late-Triassic (229 Ma). Genesis of the Huashiban high ? Nd(t)-? Hf(t) granites involved into two processes: (1) underplating of the sub-arc mantle into the lower crust, and (2) remelting of the juvenile crustal materials in response to the upwelling of the asthenospheric mantle in the post-collisional setting.

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