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Geochronology and petrogenesis of Triassic high-K calc-alkaline granodiorites in the East Kunlun orogen, West China: Juvenile lower crustal melting during post-collisional extension

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Abstract

This study reports zircon U-Pb and Hf isotopes and whole-rock elemental data for granodiorites from the East Kunlun orogen. The zircon U-Pb dating defines their crystallization age of 235 Ma. The rocks are characterized by high-K calc-alkaline, magnesian and metaluminous with (K2O+Na2O)=6.38 wt.%–7.01 wt.%, Mg#=42–50 [Mg#=100×molar Mg/(Mg+FeOT)], A/CNK=0.92–0.98, coupled with high ε Hf(t) values from -0.65 to -1.80. The rocks were derived from partial melting of a juvenile mafic crustal source within normal crust thickness. The juvenile lower crust was generated by mixing lithospheric mantle-derived melt (55%–60%) and supracrustal melt (40%–45%) during the seafloor subduction. Together with available data from the East Kunlun, it is proposed that the studied Middle Triassic granodiorites were formed in post-collisional extension setting, in which melting of the juvenile lower crust in response to the basaltic magma underplating resulted in the production of high-K granodioritic melts.

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Authors and Affiliations

  1. Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Ministry of Land and Resources, College of Earth Sciences, Chengdu University of Technology, Chengdu, 610059, China

    Fuhao Xiong

  2. State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China

    Fuhao Xiong

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

    Changqian Ma & Hang Zhang

  4. Changsha Uranium Geology Research Institute, CNNC, Changsha, 410007, China

    Hong’an Jiang

Authors
  1. Fuhao Xiong
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  2. Changqian Ma
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  3. Hong’an Jiang
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  4. Hang Zhang
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Correspondence to Changqian Ma.

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Xiong, F., Ma, C., Jiang, H. et al. Geochronology and petrogenesis of Triassic high-K calc-alkaline granodiorites in the East Kunlun orogen, West China: Juvenile lower crustal melting during post-collisional extension. J. Earth Sci. 27, 474–490 (2016). https://doi.org/10.1007/s12583-016-0674-6

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  • DOI: https://doi.org/10.1007/s12583-016-0674-6

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