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    Petrogenesis of early Jurassic basalts in southern Jiangxi Province, South China: Implications for the thermal state of the Mesozoic mantle beneath South China

    Access Status
    Fulltext not available
    Authors
    Cen, T.
    Li, W.
    Wang, Xuan-Ce
    Pang, C.
    Li, Zheng-Xiang
    Xing, G.
    Zhao, X.
    Tao, J.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Cen, T. and Li, W. and Wang, X. and Pang, C. and Li, Z. and Xing, G. and Zhao, X. et al. 2016. Petrogenesis of early Jurassic basalts in southern Jiangxi Province, South China: Implications for the thermal state of the Mesozoic mantle beneath South China. Lithos. 256-257: pp. 311-330.
    Source Title
    Lithos
    DOI
    10.1016/j.lithos.2016.03.022
    ISSN
    0024-4937
    School
    Department of Applied Geology
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140100826
    http://purl.org/au-research/grants/arc/FL150100133
    URI
    http://hdl.handle.net/20.500.11937/14003
    Collection
    • Curtin Research Publications
    Abstract

    Early Jurassic bimodal volcanic and intrusive rocks in southern South China show distinct associations and distribution patterns in comparison with those of the Middle Jurassic and Cretaceous rocks in the area. It is widely accepted that these rocks formed in an extensional setting, although the timing of the onset and the tectonic driver for extension are debated. Here, we present systematic LA–ICP–MS zircon U–Pb ages, whole-rock geochemistry and Sr–Nd isotope data for bimodal volcanic rocks from the Changpu Formation in the Changpu–Baimianshi and Dongkeng–Linjiang basins in southern Jiangxi Province, South China. Zircon U–Pb ages indicate that the bimodal volcanic rocks erupted at ca. 190 Ma, contemporaneous with the Fankeng basalts (~ 183 Ma). A compilation of geochronological results demonstrates that basin-scale basaltic eruptions occurred during the Early Jurassic within a relatively short interval (< 5 Ma). These Early Jurassic basalts have tholeiitic compositions and OIB-like trace element distribution patterns.Geochemical analyses show that the basalts were derived from depleted asthenospheric mantle, dominated by a volatile-free peridotite source. The calculated primary melt compositions suggest that the basalts formed at 1.9–2.1 GPa, with melting temperatures of 1378 °C–1405 °C and a mantle potential temperature (TP) ranging from 1383 °C to 1407 °C. The temperature range is somewhat hotter than normal mid-ocean-basalt (MORB) mantle but similar to an intra-plate continental mantle setting, such as the Basin and Range Province in western North America. This study provides an important constraint on the Early Jurassic mantle thermal state beneath South China.

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