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    U-Pb and Re-Os geochronology and geochemistry of the Donggebi Mo deposit, Eastern Tianshan, NW China: Insights into mineralization and tectonic setting

    Access Status
    Fulltext not available
    Authors
    Sun, H.
    Li, H.
    Danisik, Martin
    Xia, Q.
    Jiang, C.
    Wu, P.
    Yang, H.
    Fan, Q.
    Zhu, D.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Sun, H. and Li, H. and Danisik, M. and Xia, Q. and Jiang, C. and Wu, P. and Yang, H. et al. 2017. U–Pb and Re–Os geochronology and geochemistry of the Donggebi Mo deposit, Eastern Tianshan, NW China: Insights into mineralization and tectonic setting. Ore Geology Reviews. 86: pp. 584-599.
    Source Title
    Ore Geology Reviews
    DOI
    10.1016/j.oregeorev.2017.03.020
    ISSN
    0169-1368
    School
    John de Laeter Centre
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP160102427
    URI
    http://hdl.handle.net/20.500.11937/52393
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier B.V.The Donggebi Mo deposit located in NW China is a newly discovered, large, stockwork-type Mo deposit with ore reserves of 441 Mt @ 0.115% Mo. Ore bodies occur along faults and fractures at the external contact zone of a concealed porphyritic granite and volcaniclastic rocks of Gandun Formation, spatially associated with a fine-grained granite. Mo-bearing veins are mainly assemblages of volatile-rich K-feldspar-quartz-oxide, K-feldspar-quartz, polymetallic sulfides and calcite-quartz. Zircon LA-ICP-MS U–Pb dating yielded concordant ages of 234.6 ± 2.7 Ma and 231.8 ± 2.4 Ma for the porphyritic granite and the fine-grained granite, respectively; molybdenite Re–Os dating gave an isochron age of 234.0 ± 2.0 Ma. These ages further confirm an important and extensive magmatic-metallogenic event in Eastern Tianshan during the Triassic Indosinian orogeny. Whole-rock major and trace element analyses indicate that the granitic rocks associated with Mo mineralization are high in Si, K, Rb, Th, Nb, Ta, Ga and LREE, but low in P, Ti, Sr and Ba, belonging to high-K calc-alkaline granites with A-type features. Magma was likely derived from the re-melting of thickened lower crust in a post-collision compression environment in the Late Permian, experienced strong crystal fractionation and formed the large Donggebi Mo deposit under an intra-plate extension setting in the Early to Middle Triassic.

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