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Geodynamic transition from subduction to extension: evidence from the geochronology and geochemistry of granitoids in the Sangsang area, southern Lhasa Terrane, Tibet

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Abstract

The northward subduction of the Neo-Tethys oceanic lithosphere and subsequent collision between India and Asia continents gave rise to the Tibetan Plateau. However, how and when oceanic subduction started to transform to an intraplate environment are still open questions. The granitoids distributed in Lhasa Terrane of south Tibet offer a unique chance for us to investigate the deep geodynamic processes. Here, we present zircon U–Pb–Hf isotope, whole-rock major and trace element and Sr–Nd isotope data of granitoid intrusions in the Sangsang area of the southern Lhasa Terrane. The Sangsang granodiorites and granites were crystallized at ca. 54 Ma, while the emplacement age of the quartz monzonites is ca. 47 Ma. The granodiorites are characterized by relatively high Mg# values (35.3–41.1) and Fe2O3t (5.16–6.26 wt%) contents, and low Na2O + K2O contents (6.4–6.9 wt%) and A/CNK values (0.91–0.99), which are similar to the geochemical characteristics of I-type, high-K calc-alkaline rocks. They have high 87Sr/86Sri ratios (0.706455–0.706490), and low εNd(t) (− 3.58 to − 2.96) and zircon εHf(t) (− 3.4 to 0.3) values, indicating they were derived from a hybrid source of ancient mafic crust and juvenile lower crust. The coeval granites have lower Mg# values (22.5–27.25) and similar zircon εHf(t) values (− 2.6 to 1.1), suggesting they were probably differentiation productions of the granodiorites. The quartz monzonites have higher Na2O + K2O contents (9.18–9.59 wt%) and A/CNK values (0.98–1.03), higher zircon εHf(t) values (− 2.2 to 2.6) and more depleted Sr and Nd isotopes than the granodiorites and granites. The quartz monzonites were probably produced by melting of mixed juvenile crustal materials and metagreywacke. The new geochronological and geochemical data help constrain the geodynamic processes in the Lhasa Terrane during the Early Cenozoic, as the Sangsang granitoids represent the change from subduction termination to intraplate extension at the southern margin of the Lhasa Terrane.

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Acknowledgements

We thank the three anonymous reviewers for their constructive and thoughtful reviews which greatly improved the manuscript. Editors Prof. Wolf-Christian Dullo and Albrecht von Quadt are thanked for their helpful comments and editorial handling. Xuefeng Chen, Hai Wu and Qiuwei Xiong are appreciated for their help in the field investigation. We thank Dr. Xinyu Wang, Xianglin Tu and Shengling Sun for their help in major and trace element analyses, Dr. Congying Li and Feng Yang for their help in LA-ICP-MS zircon U–Pb dating, and Dr. Le Zhang for his help in zircon Lu–Hf isotopic analyses. Feng Huang thanks Hongli Li, Xiyao Li and Kang Cao for the early discussion and thanks Dr. Tyrone Rooney for offering the opportunity to complete the revision in Michigan State University. This research was supported by the National Key Research and Development Project of China (Project 2016YFC0600304), the Major State Basic Research Program of the People’s Republic of China (2015CB452602), the Second Tibetan Plateau Scientific Expedition and Research (STEP) (2019QZKK0702), the National Natural Science Foundation of China (41603033, 41730427, 41773026, 41703001 and 41803030), the Support Program of National Postdoctor Program for Innovative Talents (Grant BX201700213), China Postdoctoral Science Foundation funded project (2017M620847), the Fundamental Research Funds for the Central Universities (2652017213), and the University Research Project of Education Department (2017KY0783). Feng Huang is supported by a scholarship from the Chinese Scholarship Council (201704910210).

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Authors and Affiliations

  1. State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Science and Resources, China University of Geosciences, 29 Xueyuan Road, Haidian District, Beijing, 100083, China

    Feng Huang, Mingjian Li, Jifeng Xu, Yunchuan Zeng & Zhao Zhang

  2. School of Earth Science and Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology, Guilin, 541004, China

    Jifeng Xu & Hongxia Yu

  3. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China

    Jianlin Chen

  4. Chengdu Institute of Geology and Mineral Resources, Chengdu, 610081, China

    Baodi Wang

  5. Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf, Beibu Gulf University, Qinzhou, 535011, China

    Ling Chen

  6. College of Resources, Hebei GEO University, Shijiazhuang, 050031, China

    Peipei Zhao

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  1. Feng Huang
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Huang, F., Li, M., Xu, J. et al. Geodynamic transition from subduction to extension: evidence from the geochronology and geochemistry of granitoids in the Sangsang area, southern Lhasa Terrane, Tibet. Int J Earth Sci (Geol Rundsch) 108, 1663–1681 (2019). https://doi.org/10.1007/s00531-019-01729-3

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