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    Across-arc geochemical variation in the Jurassic magmatic zone, Southern Tibet: Implication for continental arc-related porphyry CuAu mineralization

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    Authors
    Wang, R.
    Tafti, R.
    Hou, Z.
    Shen, Z.
    Guo, N.
    Evans, Noreen
    Jeon, H.
    Li, Q.
    Li, W.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Wang, R. and Tafti, R. and Hou, Z. and Shen, Z. and Guo, N. and Evans, N. and Jeon, H. et al. 2017. Across-arc geochemical variation in the Jurassic magmatic zone, Southern Tibet: Implication for continental arc-related porphyry CuAu mineralization. Chemical Geology. 451: pp. 116-134.
    Source Title
    Chemical Geology
    DOI
    10.1016/j.chemgeo.2017.01.010
    ISSN
    0009-2541
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/50974
    Collection
    • Curtin Research Publications
    Abstract

    The Jurassic Gangdese arc hosts the giant Xietongmen (Xiongcun) porphyry CuAu magmatic-hydrothermal centre. In order to understand the tectonomagmatic framework of the arc and its controls on the origin and temporal-spatial distribution of porphyry mineralization we conducted extensive major and trace, and isotopic analysis on a suite of samples collected regionally. Geochemical variations were observed across the Jurassic arc from south to north, controlled by northward subduction of the Neo-Tethyan oceanic plate and overlying Lhasa lithosphere. In the frontal arc (latitude 29°-29.55°N), the magmas had high Ba/La and Ba/Th ratios, high eNd(t) (+3 to +7) values, and their zircons have high eHf(t) (+10 to +18) values, and heterogeneous O isotopic compositions (d18O=+3.6 to +6.6‰). The low titanium-in-zircon temperature and zircon saturation temperature (both average=~700°C) suggest that a greater flux of dehydration fluids from the subducting slab triggered partial melting of the mantle wedge in the southern arc. High zircon Eu/Eu* and Ce/Nd ratios (>0.4 and >20, respectively) indicate highly oxidized, fertile magmas, from which the Xietongmen porphyry CuAu deposit formed. In contrast, the interior arc (north of latitude 29.55°), close to the ancient Tibetan basement, shows low Ba/La and Ba/Th ratios, low eNd(t) (-0.1 to +2.5) and zircon eHf(t) (+2 to +12) values, and less heterogeneous zircon O isotopic compositions with higher d18O values. Higher titanium-in-zircon and zircon saturation temperatures (mostly >750°C) suggest that less water was involved during the partial melting of mantle wedge in this region. Low zircon Eu/Eu* and Ce/Nd ratios (mostly <0.4 and <20, respectively) point towards less oxidized magmatic conditions. We conclude that across-arc geochemical and fluid-flux variations controlled the formation and spatial distribution of Jurassic porphyry deposits in the Gangdese belt.

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