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Article

Petrogenesis and Tectonic Setting of Late Permian Granitoids in the East Kunlun Orogenic Belt, NW China: Constraints from Petrology, Geochemistry and Zircon U-Pb-Lu-Hf Isotopes

by
Chao Hui
1,
Fengyue Sun
1,2,*,
Tao Wang
3,4,
Yanqian Yang
3,4,
Yun Chai
3,4,
Jiaming Yan
1,
Bakht Shahzad
1,
Bile Li
1,4,
Yajing Zhang
1,
Tao Yu
5,
Xingsen Chen
1,
Chengxian Liu
1,
Xinran Zhu
1,
Yuxiang Wang
1,
Zhengsong Wang
1,
Haoran Li
1,
Renyi Song
1 and
Desheng Dou
1
1
College of Earth Sciences, Jilin University, Changchun 130061, China
2
Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources of China, Jilin University, Changchun 130061, China
3
Qinghai Geological Survey, Xining 810000, China
4
Technology Innovation Center for Exploration and Exploitation of Strategic Mineral Resources in Plateau Desert Region, Ministry of Natural Resources, Xining 810000, China
5
Northeast Oli & Gas Branch of SINOPEC, Changchun 130062, China
*
Author to whom correspondence should be addressed.
Minerals 2025, 15(4), 381; https://doi.org/10.3390/min15040381
Submission received: 16 February 2025 / Revised: 10 March 2025 / Accepted: 31 March 2025 / Published: 4 April 2025
(This article belongs to the Special Issue Genesis of Calc-Alkaline Granitic Rocks: Evidence from Petrology and Geochemistry)
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Abstract

Permian magmatic rocks are extensively distributed in the East Kunlun Orogenic Belt (EKOB), yet controversies persist regarding the petrogenesis of granitoid rocks and the tectonic evolution of the Buqingshan-A’nyemaqing Ocean (BAO), which is a part of the Paleo-Tethys. This study addresses these debates through petrological analyses, whole-rock geochemistry and zircon U-Pb-Lu-Hf isotopic investigations of newly identified granitoids in the EKOB. Monzogranite (MG) and quartz porphyry (QP) yield weighted mean ages of 254.7 ± 1.1 Ma and 254.3 ± 1.1 Ma, respectively. Geochemically, the MG shows metaluminous to weakly peraluminous low-K calc-alkaline I-type affinity, characterized by high SiO2 and low K2O, MgO and FeOT contents, as well as marked enrichment in light rare earth elements (LREEs), but depletion in Eu, Ba, Sr, P and Ti anomalies. In contrast, the QP exhibits a peraluminous high-K calc-alkaline I-type affinity, displaying high SiO2 but low Na2O and P2O5 contents. It is enriched in LREEs and Rb but displays negative Nb, Sr, P and Ti anomalies. Zircon εHf(t) values range from −1.6 to 2.6 for MG and −4.4 to 1.5 for QP. We suggest that both MG and QP were derived from the partial melting of juvenile mafic lower crust, and that MG underwent a high degree of fractional crystallization. A synthesis of multiscale geological evidence allows us to propose a five-stage tectonic evolution for the BAO in the EKOB: (1) oceanic basin initiation before ca. 345 Ma; (2) incipient northward subduction commencing at ca. 278 Ma; (3) slab rollback stage (263–240 Ma); (4) syn-collisional compression (240–230 Ma); (5) post-collisional extension (230–195 Ma).
Keywords: East Kunlun Orogenic Belt; Permian granitoids; paleo-Tethys ocean; slab rollback; tectonic evolution East Kunlun Orogenic Belt; Permian granitoids; paleo-Tethys ocean; slab rollback; tectonic evolution
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MDPI and ACS Style

Hui, C.; Sun, F.; Wang, T.; Yang, Y.; Chai, Y.; Yan, J.; Shahzad, B.; Li, B.; Zhang, Y.; Yu, T.; et al. Petrogenesis and Tectonic Setting of Late Permian Granitoids in the East Kunlun Orogenic Belt, NW China: Constraints from Petrology, Geochemistry and Zircon U-Pb-Lu-Hf Isotopes. Minerals 2025, 15, 381. https://doi.org/10.3390/min15040381

AMA Style

Hui C, Sun F, Wang T, Yang Y, Chai Y, Yan J, Shahzad B, Li B, Zhang Y, Yu T, et al. Petrogenesis and Tectonic Setting of Late Permian Granitoids in the East Kunlun Orogenic Belt, NW China: Constraints from Petrology, Geochemistry and Zircon U-Pb-Lu-Hf Isotopes. Minerals. 2025; 15(4):381. https://doi.org/10.3390/min15040381

Chicago/Turabian Style

Hui, Chao, Fengyue Sun, Tao Wang, Yanqian Yang, Yun Chai, Jiaming Yan, Bakht Shahzad, Bile Li, Yajing Zhang, Tao Yu, and et al. 2025. "Petrogenesis and Tectonic Setting of Late Permian Granitoids in the East Kunlun Orogenic Belt, NW China: Constraints from Petrology, Geochemistry and Zircon U-Pb-Lu-Hf Isotopes" Minerals 15, no. 4: 381. https://doi.org/10.3390/min15040381

APA Style

Hui, C., Sun, F., Wang, T., Yang, Y., Chai, Y., Yan, J., Shahzad, B., Li, B., Zhang, Y., Yu, T., Chen, X., Liu, C., Zhu, X., Wang, Y., Wang, Z., Li, H., Song, R., & Dou, D. (2025). Petrogenesis and Tectonic Setting of Late Permian Granitoids in the East Kunlun Orogenic Belt, NW China: Constraints from Petrology, Geochemistry and Zircon U-Pb-Lu-Hf Isotopes. Minerals, 15(4), 381. https://doi.org/10.3390/min15040381

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