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Early Cretaceous (ca. 100 Ma) magmatism in the southern Qiangtang subterrane, central Tibet: Product of slab break-off?

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Abstract

The lack of Early Cretaceous magmatic records with high-quality geochemical data in the southern Qiangtang subterrane has inhibited a complete understanding of the magmatic processes and geological evolution of central Tibet. In this study, we present zircon U–Pb ages, whole-rock geochemistry, and Sr–Nd–Pb and zircon Hf isotopic data for the newly discovered Moku pluton in the southern Qiangtang subterrane. Zircon U–Pb dating reveals that the Moku granites were emplaced in the Early Cretaceous (ca. 100 Ma) and are coeval with the hosted dioritic enclaves. The granites are slightly peraluminous and high-K calc-alkaline I-type granites and characterized by initial (87Sr/86Sr)i ratios of 0.70605–0.70658, negative ε Nd(t) values (−4.44 to −3.35), and Nd isotopic model ages of 1.19–1.29 Ga. The granites have a wide range of zircon ε Hf(t) values (−24.4 to 2.6) and concordant ratios of (206Pb/204Pb)t = 18.645–18.711, (207Pb/204Pb)t = 15.656–15.666, and (208Pb/204Pb)t = 38.751–38.836. The coeval dioritic enclaves are medium- to high-K calc-alkaline rocks with zircon ε Hf(t) values of −13.3 to +3.6. The geochemical signatures of the host granites and coeval dioritic enclaves indicate that the Moku pluton was most likely generated by partial melting of the ancient lower crust with contributions from mantle-derived melts. Our new data, together with other recently published data, indicate that the ca. 100 Ma magmatic rocks were derived from anatexis of the Qiangtang lower crust that mixed with upwelling asthenosphere materials in response to the slab break-off of the northward subduction of the Bangong–Nujiang oceanic lithosphere.

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Acknowledgments

We would like to thank two reviewers for their constructive and helpful reviews. We also sincerely thank Jun Meng and Yuan Gao for their assistance in the field and their assistance with U–Pb dating analyses. We are grateful for helpful discussions with Jingen Dai and Zhidan Zhao. The research was financially supported by the National Natural Science Foundation of China (41572188 and 41172129), the National Key Project for Basic Research of China (Project 2012CB822000) and the China Geological Survey (1212011221103 and 1212011086037).

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  1. State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China

    Yalin Li, Haiyang He, Chengshan Wang, Yushuai Wei, Xi Chen, Zijie Ning & Aorigele Zhou

  2. Chengdu Institute of Geology and Mineral Resources, Chengdu, 610082, China

    Juan He

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  1. Yalin Li
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Correspondence to Yalin Li.

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Li, Y., He, H., Wang, C. et al. Early Cretaceous (ca. 100 Ma) magmatism in the southern Qiangtang subterrane, central Tibet: Product of slab break-off?. Int J Earth Sci (Geol Rundsch) 106, 1289–1310 (2017). https://doi.org/10.1007/s00531-016-1391-3

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