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Petrogenesis of Luchuba and Wuchaba granitoids in western Qinling: geochronological and geochemical evidence

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Abstract

The West Qinling Orogenic Belt (WQOB) is a major portion of the Qinling-Dabie-Sulu Orogen and holds essential information for understanding the prolonged evolution of the northeastern branch of the Paleo-Tethys in East Asia. This study focuses on the petrogenesis of granitoids from Luchuba and Wuchaba plutons in the WQOB. We obtained zircon U-Pb ages of 211 ± 1.4 Ma for the Luchuba pluton and 218.7 ± 1.3 Ma for the Wuchaba pluton, which are the same as the proposed timing of continental collision at ∼220 Ma. We thus interpret the granitoids to represent a magmatic response to the collision between the North China Craton (NCC) and the Yangtze Block (YB). The two plutons are metaluminous to weakly peraluminous I-type granitoids. Samples from the two plutons show strong light rare earth element (REEs) enrichment and weak heavy REE depletion, with varying negative Eu anomalies, which is most consistent with significant plagioclase fractionation although the possible effect of plagioclase as residual phase in the magma source region cannot be ruled out. In primitive mantle normalized multi-element variation diagrams, nearly all the samples show negative Nb, Ta, P and Ti anomalies and relative enrichment in Rb, Pb, U and K. These characteristics resemble those of the average continental crust. The Luchuba pluton has lower (87Sr/86Sr)i (0.7051 to 0.7104), higher εNd(t) (−8.11 to −5.73) and εHf(t) (−6.70 to −1.65) than mature continental crust ([87Sr/86Sr] i  > 0.72, εNd(t) < −12). The Wuchaba pluton also has lower (87Sr/86Sr)i (0.7069 to 0.7080), higher εNd(t) (−9.86 to −3.34) and εHf(t) (−5.69 to 1.58) than mature continental crust. We conclude that the Luchuba and Wuchaba granitoids in the WQOB are best explained as resulting from fractional crystallization with crustal assimilation of parental magmas derived from melting of Mianlue oceanic crust under amphibolite facies conditions during the initial stage of continental collision between the North China Craton and the Yangtze Block. Mafic magmatic enclaves (MMEs) of Wuchaba pluton are earlier cumulates of the same magmatic system. The Mianlue oceanic crust (MORB-like) contributes to the source of the Luchuba and Wuchaba granitoids, pointing to the significance of melting of oceanic crust for continental crust accretion.

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Acknowledgements

We thank Cui Huixia, Gong Hongmei, Guo Pengyuan, Hu Zhenxing, Liu Jinju, Ma Yuxin, Sun Pu, Sun Wenli, Wang Xiaohong, Ye Lei, Ye Xiaolu and Zhang Guorui for assistance with sample preparation. We particularly thank Su Li for major and trace element analysis and zircon analysis and Ma Jinlong for Sr-Nd-Hf isotope analysis. This work was supported by grants from National Natural Science Foundation of China (41130314, 91014003), Chinese Academy of Sciences, regional and local authorities (Shandong Province and City of Qingdao) and Qingdao National laboratory of ocean sciences and Technology.

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Authors and Affiliations

  1. Institute of Oceanology, Chinese Academy of Sciences, No. 7 Nanhai Road, Shinan District, Qingdao, 266071, China

    Juanjuan Kong, Yaoling Niu, Yan Hu, Jiyong Li & Shuo Chen

  2. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266061, China

    Juanjuan Kong, Yaoling Niu, Jiyong Li & Shuo Chen

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Juanjuan Kong, Jiyong Li & Shuo Chen

  4. Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK

    Yaoling Niu

  5. School of Earth Science and Resources, China University of Geosciences, Beijing, 100083, China

    Meng Duan

  6. School of Earth Sciences, Lanzhou University, Lanzhou, 730000, China

    Yu Zhang

Authors
  1. Juanjuan Kong
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  2. Yaoling Niu
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  3. Meng Duan
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  4. Yu Zhang
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  5. Yan Hu
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  6. Jiyong Li
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  7. Shuo Chen
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Corresponding authors

Correspondence to Juanjuan Kong or Yaoling Niu.

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Editorial handling: Y. Xu

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Kong, J., Niu, Y., Duan, M. et al. Petrogenesis of Luchuba and Wuchaba granitoids in western Qinling: geochronological and geochemical evidence. Miner Petrol 111, 887–908 (2017). https://doi.org/10.1007/s00710-017-0501-7

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  • DOI: https://doi.org/10.1007/s00710-017-0501-7

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