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Petrogenesis and tectonic implications of the early Mesozoic granitoids in the northern Alxa region, Central Asian Orogenic Belt

Published online by Cambridge University Press:  21 December 2022

Xiaochen Zhao*
Affiliation:
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
Chiyang Liu
Affiliation:
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
Jianqiang Wang*
Affiliation:
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
Yazhuo Niu
Affiliation:
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi’an Centre of Geological Survey (Northwest China Centre of Geoscience Innovation), China Geological Survey, Xi’an, 710054, China
Lei Huang
Affiliation:
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
Shaohua Zhang
Affiliation:
Shaanxi Key Laboratory of Petroleum Accumulation Geology, School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an, 710065, China
Fangpeng Du
Affiliation:
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
Heng Peng
Affiliation:
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
Yingtao Chen
Affiliation:
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
Tao Peng
Affiliation:
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
Zhengzheng Mao
Affiliation:
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
*
Authors for correspondence: Jianqiang Wang, Email: wjq@nwu.edu.cn; Xiaochen Zhao, Email: zxcnwu@126.com
Authors for correspondence: Jianqiang Wang, Email: wjq@nwu.edu.cn; Xiaochen Zhao, Email: zxcnwu@126.com

Abstract

The northern Alxa region is located in the central segment of the southern Central Asian Orogenic Belt. Many controversies and deficiencies still exist regarding the magma source characteristics, petrogenesis and tectonic regimes during the late Palaeozoic – early Mesozoic period within this region. This study presents whole-rock compositions and zircon U–Pb and Lu–Hf isotopic data for three early Mesozoic I- and A-type granitic plutons occurring in the northern Alxa region. The Haerchaoenji and Chahanhada I-type granitoids yielded zircon 206Pb–238U ages of 245 ± 5 Ma and 245 ± 2 Ma, respectively. The variable positive zircon ϵHf(t) values between +1.8 and +11.8, with young TDM ages of 425–837 Ma, indicate that these I-type granitoids were mainly derived from juvenile crustal materials. The Wulantaolegai pluton has a zircon 206Pb–238U age of 237 ± 2 Ma and is classified as having high-K calc-alkaline A-type affinity. Furthermore, the positive zircon ϵHf(t) values of the Wulantaolegai granite range from +3.3 to +8.7 with young TDM ages of 545–778 Ma, suggesting the involvement of a juvenile crustal source as well. Furthermore, the major-element compositions of the Chahanhada and Wulantaolegai granites suggest the input of metasedimentary components. Geochemically, the Haerchaoenji and Chahanhada I-type granitoids show an arc affinity, while the Wulantaolegai granite exhibits a post-collisional affinity. However, with regional data, we suggest that the Haerchaoenji and Chahanhada I-type granitoids were also emplaced in a post-collisional setting, and the arc affinity was probably inherited from recycled subduction-related materials. These lines of evidence obtained in this study enable us to argue that the Palaeo-Asian Ocean in the central segment of the Central Asian Orogenic Belt closed before Middle Triassic time.

Type
Original Article
Copyright
© The Author(s), 2022. Published by Cambridge University Press

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Table S1

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