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Volume 35 Issue 3
Jun 2024
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Article Contents
Hua Li, Ming Wang, Jiqing Li, Haikui Tong, Jiaxiang Dong, Minggang Tian, Xiaolin Chen, Leguang Li, Ting Xie, Xiong Li, Yuying Che. Geochemistry and Zircon U-Pb and Hf Isotopes of Early Devonian Hardawu Granites in the Eastern Segment of the Ultrahigh-Pressure Metamorphic Belt, Northern Qaidam Basin. Journal of Earth Science, 2024, 35(3): 866-877. doi: 10.1007/s12583-022-1791-1
Citation: Hua Li, Ming Wang, Jiqing Li, Haikui Tong, Jiaxiang Dong, Minggang Tian, Xiaolin Chen, Leguang Li, Ting Xie, Xiong Li, Yuying Che. Geochemistry and Zircon U-Pb and Hf Isotopes of Early Devonian Hardawu Granites in the Eastern Segment of the Ultrahigh-Pressure Metamorphic Belt, Northern Qaidam Basin. Journal of Earth Science, 2024, 35(3): 866-877. doi: 10.1007/s12583-022-1791-1

Geochemistry and Zircon U-Pb and Hf Isotopes of Early Devonian Hardawu Granites in the Eastern Segment of the Ultrahigh-Pressure Metamorphic Belt, Northern Qaidam Basin

doi: 10.1007/s12583-022-1791-1
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  • Corresponding author: Ming Wang, qhddywangming@163.com
  • Received Date: 21 Sep 2022
  • Accepted Date: 26 Nov 2022
  • Issue Publish Date: 30 Jun 2024
  • The Hardawu granites in the eastern segment of the ultrahigh-pressure metamorphic belt, the northern Qaidam Basin, were studied by whole-rock major and trace elements and in-situ zircon U-Pb geochronology and Hf isotopes to discuss the petrogenesis and tectonic evolution. Geochronological results show that the granites have a crystallization age of 401 ± 3 Ma, suggesting that they were formed in the Early Devonian. The granites have SiO2 contents of 75.32 wt.%–76.05 wt.%, total alkali contents of 8.23 wt.%–8.36 wt.%, and K2O/Na2O ratios of 1.62–1.91. They were rich in K2O, poor in TiO2, MnO, MgO, and P2O5, and have A/CNK values of 1.05–1.07, Rittmann index δ values of 2.05–2.14, and differentiation index (DI) values of 92.85–94.18. They are high potassium calc-alkaline, weak-peraluminum, and highly differentiated I-type granites. The granites also show enrichment of large ion lithophile elements (LILE) such as Rb, Ba, and Th, and depletion of high field strength elements (HFSE) such as Nb, Ta, and Ti. The total REE concentrations range from 169 ppm to 232 ppm, with enrichments of light rare earth elements and negative Eu anomalies (δEu = 0.39–0.55). The zircon εHf(t) values range from -0.65 to -2.29, and the two-stage model ages (tDM2) changed within a small range of 1.44 to 1.54 Ga, indicating that the magma of the Hardawu granites was originated from the partial melting of Mesoproterozoic lower crustal materials. Combined with previous studies, we suggest that the Hardawu granites were formed in the extensional tectonic setting after the collision between the Qaidam Block and the central and southern Qilian Block in the Early Devonian.

     

  • Conflict of Interest
    The authors declare that they have no conflict of interest.
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