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    Cooling and exhumation of the Late Paleozoic Tulasu epithermal gold system, Western Tianshan, NW China: implications for preservation of Pre-Mesozoic epithermal deposits

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    Authors
    Zhao, Xiao-Bo
    Xue, Chun-Ji
    Zhao, Wei-Ce
    Seltmann, Reimar cc
    Symons, David T.A.
    Dolgopolova, Alla cc
    Zhang, Yong
    Issue date
    2020-11-22
    Submitted date
    2020-11-30
    
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    Abstract
    Epithermal gold deposits are rarely well preserved in pre-Mesozoic terranes because their low-temperature mineralization in shallow crust levels, and easily destroyed by subsequent erosion or depleted by tectonic events. However, several significant late Paleozoic epithermal gold deposits have been found in the Tulasu volcanic basin in NW China, forming one of the largest gold districts in the western Tianshan orogen. Here, we report new 40Ar/39Ar age from a monzonite porphyry enclave hosted in andesite and apatite fission track (AFT) data for 10 volcanic rocks from the Tulasu basin. These data, combined with the previous dataset, are used to perform inverse thermal modelling to quantify the district's cooling and exhumation history. Our modelling indicates a phase of burial reheating during late Paleozoic sedimentation following the mineralization, and subsequent a rapid exhumation in the Jurassic to Early Cretaceous (∼196–128 Ma), and a slow exhumation until to present. The Mesozoic exhumation is likely related to the far-field effects of the Cimmerian orogeny along the southern Eurasian margin. Therefore, we suggest that the quick burial by thick sediments and the slow protracted exhumation after mineralization were crucial for the preservation of the Paleozoic epithermal gold system at Tulasu.
    Citation
    Cooling and exhumation of the Late Paleozoic Tulasu epithermal gold system, Western Tianshan, NW China: implications for preservation of Pre-Mesozoic epithermal deposits Xiao-Bo Zhao, Chun-Ji Xue, Wei-Ce Zhao, Reimar Seltmann, David T.A. Symons, Alla Dolgopolova and Yong Zhang Journal of the Geological Society, 26 November 2020, https://doi.org/10.1144/jgs2020-099
    Publisher
    Geological Society of London
    Journal
    Journal of the Geological Society
    URI
    http://hdl.handle.net/10141/622876
    DOI
    https://doi.org/10.1144/jgs2020-099
    Type
    Journal Article
    Item Description
    © 2020 The Author(s). Published by The Geological Society of London. All rights reserved. For permissions: http://www.geolsoc.org.uk/permissions. Publishing disclaimer: www.geolsoc.org.uk/pub_ethics The attached file is the final accepted manuscript.
    ISSN
    0016-7649
    EISSN
    2041-479X
    ae974a485f413a2113503eed53cd6c53
    https://doi.org/10.1144/jgs2020-099
    Scopus Count
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    Earth sciences

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