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    The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits, central Lhasa

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    Fulltext not available
    Authors
    Zhao, J.
    Qin, K.
    Li, G.
    Cao, M.
    Evans, Noreen
    McInnes, Brent
    Li, J.
    Xiao, B.
    Chen, L.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhao, J. and Qin, K. and Li, G. and Cao, M. and Evans, N. and McInnes, B. and Li, J. et al. 2015. The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits, central Lhasa. Ore Geology Reviews. 65 Part 4: pp. 1043-1061.
    Source Title
    Ore Geology Reviews
    DOI
    10.1016/j.oregeorev.2014.09.026
    ISSN
    0169-1368
    School
    John de Laeter CoE in Mass Spectrometry
    URI
    http://hdl.handle.net/20.500.11937/17274
    Collection
    • Curtin Research Publications
    Abstract

    The large, newly discovered Sharang porphyry Mo deposit and nearby Yaguila skarn Pb–Zn–Ag (–Mo) deposit reside in the central Lhasa terrane, northern Gangdese metallogenic belt, Tibet. Multiple mineral chronometers (zircon U–Pb, sericite 40Ar–39Ar, and zircon and apatite (U–Th)/He) reveal that ore-forming porphyritic intrusions experienced rapid cooling (>100 °C/Ma) during a monotonic magmatic–hydrothermal evolution. The magmatic–hydrothermal ore-forming event at Sharang lasted ~6.0 Myr (~1.8 Myr for cooling from N900 to 350 °C and ~4.0 Myr for cooling from 350 to 200 °C) whereas cooling was more prolonged during ore formation at Yaguila (~1.8 Myr from >900 to 500 °C and a maximum of ~16 Myr from >900 to 350 °C). All porphyritic intrusions in the ore district experienced exhumation at a rate of 0.07–0.09 mm/yr (apatite He ages between ~37 and 30 Ma). Combined with previous studies, this work implies that uplift of the eastern section of the Lhasa terrane expanded from central Lhasa (37–30 Ma) to southern Lhasa (15–12 Ma) at an increasing exhumation rate. All available geochronologic data reveal that magmatic–hydrothermal–exhumation activities in the Sharang–Yaguila ore district occurred within four periods of magmatism with related mineralization. Significant porphyry-type Mo mineralization was associated with Late Cretaceous–Eocene felsic porphyritic intrusions in the central Lhasa terrane, resulting from Neotethyan oceanic subduction and India–Asia continental collision.

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