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    Post-Triassic thermal history of the Tazhong Uplift Zone in the Tarim Basin, Northwest China: Evidence from apatite fission-track thermochronology

    Access Status
    Open access via publisher
    Authors
    Xiang, C.
    Pang, X.
    Danisik, Martin
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Xiang, C. and Pang, X. and Danisik, M. 2013. Post-Triassic thermal history of the Tazhong Uplift Zone in the Tarim Basin, Northwest China: Evidence from apatite fission-track thermochronology. Geoscience Frontiers. 4 (6): pp. 743-754.
    Source Title
    Geoscience Frontiers
    DOI
    10.1016/j.gsf.2012.11.010
    ISSN
    1674-9871
    School
    John de Laeter CoE in Mass Spectrometry
    URI
    http://hdl.handle.net/20.500.11937/51843
    Collection
    • Curtin Research Publications
    Abstract

    The Tarim Basin is a representative example of the basins developed in the northwest China that are characterized by multiple stages of heating and cooling. In order to better understand its complex thermal history, apatite fission track (AFT) thermochronology was applied to borehole samples from the Tazhong Uplift Zone (TUZ). Twelve sedimentary samples of Silurian to Triassic depositional ages were analyzed from depths coinciding with the apatite partial annealing zone (~60-120 C). The AFT ages, ranging from 132 ± 7 Ma (from a Triassic sample) to 25 ± 2 Ma (from a Carboniferous sample), are clearly younger than their depositional ages and demonstrate a total resetting of the AFT thermometer after deposition. The AFT ages vary among different tectonic belts and decrease from the No. Ten Faulted Zone (133-105 Ma) in the northwest, the Central Horst Zone in the middle (108-37 Ma), to the East Buried Hill Zone in the south (51-25 Ma). Given the low magnitude of post-Triassic burial heating evidenced by low vitrinite reflectance values (Ro < 0.7%), the total resetting of the AFT system is speculated to result from the hot fluid flow along the faults. Thermal effects along the faults are well documented by younger AFT ages and unimodal single grain age distributions in the vicinity of the faults. Permian-early Triassic basaltic volcanism may be responsible for the early Triassic total annealing of those samples lacking connectivity with the fault. The above arguments are supported by thermal modeling results.© 2013, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.

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