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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

Fuhao Xiong Changqian Ma Hong’an Jiang Hang Zhang

Fuhao Xiong, Changqian Ma, Hong’an Jiang, Hang Zhang. 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]. Journal of Earth Science, 2016, 18(3): 474-490. doi: 10.1007/s12583-016-0674-6
引用本文: Fuhao Xiong, Changqian Ma, Hong’an Jiang, Hang Zhang. 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]. Journal of Earth Science, 2016, 18(3): 474-490. doi: 10.1007/s12583-016-0674-6
Fuhao Xiong, Changqian Ma, Hong’an Jiang, Hang Zhang. 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. Journal of Earth Science, 2016, 18(3): 474-490. doi: 10.1007/s12583-016-0674-6
Citation: Fuhao Xiong, Changqian Ma, Hong’an Jiang, Hang Zhang. 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. Journal of Earth Science, 2016, 18(3): 474-490. doi: 10.1007/s12583-016-0674-6

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

doi: 10.1007/s12583-016-0674-6

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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出版历程
  • 收稿日期:  2016-06-13
  • 修回日期:  2016-06-13
  • 刊出日期:  2016-06-13

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

doi: 10.1007/s12583-016-0674-6

摘要: 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 εHf(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.

English Abstract

Fuhao Xiong, Changqian Ma, Hong’an Jiang, Hang Zhang. 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]. Journal of Earth Science, 2016, 18(3): 474-490. doi: 10.1007/s12583-016-0674-6
引用本文: Fuhao Xiong, Changqian Ma, Hong’an Jiang, Hang Zhang. 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]. Journal of Earth Science, 2016, 18(3): 474-490. doi: 10.1007/s12583-016-0674-6
Fuhao Xiong, Changqian Ma, Hong’an Jiang, Hang Zhang. 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. Journal of Earth Science, 2016, 18(3): 474-490. doi: 10.1007/s12583-016-0674-6
Citation: Fuhao Xiong, Changqian Ma, Hong’an Jiang, Hang Zhang. 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. Journal of Earth Science, 2016, 18(3): 474-490. doi: 10.1007/s12583-016-0674-6

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