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    Identifying late Carboniferous sanukitoids in Hala’alate Mountain, Northwest China: new constraint on the closing time of remnant ocean basin in West Junggar

    242111.pdf (2.165Mb)
    Access Status
    Open access
    Authors
    Li, G.
    Li, Y.
    Wang, Xuan-Ce
    Yang, G.
    Wang, R.
    Xiang, K.
    Liu, J.
    Tong, L.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Li, G. and Li, Y. and Wang, X. and Yang, G. and Wang, R. and Xiang, K. and Liu, J. et al. 2016. Identifying late Carboniferous sanukitoids in Hala’alate Mountain, Northwest China: new constraint on the closing time of remnant ocean basin in West Junggar. International Geology Review. 59 (9): pp. 1116-1130.
    Source Title
    International Geology Review
    DOI
    10.1080/00206814.2016.1193773
    ISSN
    0020-6814
    School
    Department of Applied Geology
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140100826
    Remarks

    This is an Author's Original Manuscript of an article published by Taylor & Francis in International Geology Review on 28/06/2016 available online at http://www.tandfonline.com/10.1080/00206814.2016.1193773

    URI
    http://hdl.handle.net/20.500.11937/36498
    Collection
    • Curtin Research Publications
    Abstract

    Volcanic rocks in the Hala’alate and Aladeyikesai formations, which are composed of basaltic andesite and pyroxene andesite, are widespread in Hala’alate Mountain, West Junggar, Northwest China. These rocks (plagioclase + clinopyroxene/olivine) formed in the late Carboniferous and show a remarkable geochemical affinity with typical sanukitoids with oversaturated SiO2 (52.9–56.9 wt.%) and high MgO (3.47–6.88 wt.%, Mg# >48) contents. They also exhibit a narrow range of Sr-Nd-Pb isotopes within (87Sr/86Sr)i = 0.7037–0.7041, εNd(t) = 4.4–6.2, 206Pb/204Pb = 18.22–18.41, 207Pb/204Pb = 15.48–15.52, 208Pb/204Pb = 37.99–38.30. Hala’alate Formation volcanic rocks are similar to the sanukitoids of Karamay, with high Sr (633.5–970.1 ppm), Ba (268.7–796.3 ppm), and Sr/Y (61.34–84.28), formed by partial melting of the mantle metasomatized by slab-derived adakitic melts. In contrast, Aladeyikesai Formation volcanic rocks show some affinity with sanukitoids of the Hatu area and the Setouchi Volcanic Belt, with low Sr (442.2–508.7 ppm), Ba (199.2–485.1 ppm), and Sr/Y (25.03–30.28), generated by the partial melting of subducting sediments. Identification of late Carboniferous sanukitoids in Hala’alate Mountain provides important constraints on the closing time of the remnant ocean basin in West Junggar, and implies that multi-stage subduction–accretionary orogeny plays a crucial role in the evolution and growth of the continental crust in the Central Asian Orogenic Belt.

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