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    Neoproterozoic mafic dyke swarms at the northern margin of the Tarim Block, NW China: Age, geochemistry, petrogenesis and tectonic implications

    Access Status
    Fulltext not available
    Authors
    Zhang, C.
    Li, Zheng-Xiang
    Li, X.
    Ye, H.
    Date
    2009
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhang, Chuan-lin and Li, Zheng-Xiang and Li, Xian-hua and Ye, Hai-min. 2009. Neoproterozoic mafic dyke swarms at the northern margin of the Tarim Block, NW China: Age, geochemistry, petrogenesis and tectonic implications. Journal of Asian Earth Sciences. 35 (2): pp. 167-179.
    Source Title
    Journal of Asian Earth Sciences
    DOI
    10.1016/j.jseaes.2009.02.003
    ISSN
    13679120
    Faculty
    Department of Applied Geology
    Faculty of Science and Engineering
    WA School of Mines
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/235/description#description. Copyright © 2009 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/18090
    Collection
    • Curtin Research Publications
    Abstract

    Zircon and baddeleyite U-Pb ages and geochemistry of the Neoproterozoic mafic dyke swarms at the northern margin of the Tarim Block, NW China, are reported here to decipher the regional Neoproterozoic tectonic evolution. The mafic dyke swarm in Aksu and the mafic dyke swarm in Quruqtagh were emplaced at 759 7 and 773 3 Ma, respectively. The samples from Quruqtagh dykes are tholeiitic in major element compositions, enriched in LILE and LREE and depleted in HFSE and HREE. Isotopically, they are characterized by large ranges of ENd(t) values (from -7.1 to 1.8) and initial 87Sr/86Sr ratios (from 0.699 to 0.708). The Aksu mafic dykes share most geochemical characteristics of the Quruqtagh mafic dykes except that they are more highly evolved and with ENd(t) values ranging from -6.4 to -5.8. Geochemical features suggest that the Aksu mafic dykes and Quruqtagh mafic dykes were likely crystallized from a similar parental magma (possibly of high MgO contents) derived from a metasomatized SCLM (sub-continental lithosphere mantle) in a non-orogenic setting. In combination with other reported Neoproterozoic igneous rocks throughout the Tarim Block, there appear to be two major phases of Neoproterozoic igneous activities at ca. 820-800 and ca. 780-750 Ma, respectively. These two phases of igneous activities were concurrent with those in many other Rodinian continents and were most likely related to mantle plume activities during the break-up of the supercontinent Rodinia.

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