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Discovery of the early Jurassic Gajia mélange in the Bangong–Nujiang suture zone: Southward subduction of the Bangong–Nujiang Ocean?

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Abstract

Mélange records a series of geological processes associated with oceanic subduction and continental collision. This paper reports for the first time the presence of Early Jurassic mélange from NW Nagqu in the southern margin of the Bangong–Nujiang suture zone, termed as the Gajia mélange. It shows typically blocks-in-matrix structure with matrix of black shale and siliceous mudstone, and several centimeters to several meters sized blocks of sandstone, silicalite, limestone and basalt. The sandstone blocks consist of homologous sandstone and two types of exotic sandstone, with different modal compositions. The Group 1 of exotic sandstone blocks consists of mainly of feldspar and quartz, whereas the Group 2 is rich in volcanic detritus. The Group 3 of homologous sandstone blocks is rich in feldspar and volcanic detritus with rare occurrence of quartz. U–Pb age data and in situ Hf isotopic compositions of detrital zircons from sandstone blocks are similar to those from the Lhasa terrane, suggesting that the sandstone blocks in the Gajia mélange most probably came from the Lhasa terrane. The YC1σ(2+) age of homologous sandstone blocks is 177 ± 2.4 Ma, suggesting an Early Jurassic depositional age for the sandstones within the Gajia mélange. The Gajia mélange likely records the southward subduction of the Bangong–Nujiang Ocean during the Early Jurassic.

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Acknowledgments

This work benefited from discussions with Jiangang Wang and Zhong Han. We thank Bin Wu, Xiong Yan for their assistance in the laboratory and Dehua Zhang for their help in the field. This study was financially supported by the CAS Strategic Priority Research Program (B) (XDB03010000) and the Chinese NSFC Project (41472081).

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  1. State Key Laboratory of Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China

    Wen Lai, Xiumian Hu & Anlin Ma

  2. State Key Laboratory of Geological Process and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China

    Dicheng Zhu

  3. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China

    Wei An

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Correspondence to Xiumian Hu.

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Lai, W., Hu, X., Zhu, D. et al. Discovery of the early Jurassic Gajia mélange in the Bangong–Nujiang suture zone: Southward subduction of the Bangong–Nujiang Ocean?. Int J Earth Sci (Geol Rundsch) 106, 1277–1288 (2017). https://doi.org/10.1007/s00531-016-1405-1

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