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

doi:10.1007/s12583-016-0674-6

Volume 27 Issue 3

Jun 2016

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Journal of Earth Science > 2016 > 27(3): 474-490.

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, 27(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, 27(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, 27(3): 474-490. doi: 10.1007/s12583-016-0674-6

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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

doi: 10.1007/s12583-016-0674-6

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
2.
State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.
Changsha Uranium Geology Research Institute, CNNC, Changsha 410007, China

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Corresponding author: Changqian Ma, cqma@cug.edu.cn
Received Date: 10 Jul 2015
Accepted Date: 01 Nov 2015
Publish Date: 10 Jun 2016

Abstract

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+FeO^T)], A/CNK=0.92–0.98, coupled with highε_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.
- East Kunlun,
- granodiorite,
- geochronology,
- Hf isotope,
- magmatism

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References(83)

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