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    Evidence for constriction and Pliocene acceleration of east-west extension in the North Lunggar rift region of west central Tibet

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    TaylorM_et_al_Evidence.pdf (21.77Mb)
    Issue Date
    2013-10-10
    Author
    Sundell, Kurt E.
    Taylor, Michael Halford
    Styron, Richard H.
    Stockli, Daniel F.
    Kapp, Paul
    Hager, Christian
    Liu, Deliang
    Ding, Lin
    Publisher
    American Geophysical Union
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    The active north trending North Lunggar rift in west central southern Tibet exposes an extensional metamorphic core complex bounded by an east dipping low-angle normal fault. Apatite and zircon (U-Th)/He thermochronology and thermal modeling of the North Lunggar rift document a minimum timing for rift inception at >10 Ma and rapid footwall exhumation between 5 and 2 Ma. Miocene footwall cooling and exhumation rates were initially slow to moderate at <50°C Ma−1 and <1 mm a−1, followed by increased Pliocene rates as high as >400°C Ma−1 and 4–10 mm a−1. Footwall isotherms were significantly compressed during rapid exhumation resulting in an elevated transient geothermal gradient between 50 and 90°C km−1. The minimum magnitude of horizontal extension for the North Lunggar rift is 8.1–12.8 km; maximum is 15–20 km, less in the south at ~10 km. Mean Pliocene extension rate is 1.2–2.4 mm a−1 in the ~120° direction. Results for the North Lunggar rift are similar in magnitude, rate, and orientation of slip to the kinematically linked Lamu Co dextral strike-slip fault to the north. This suggests a state of constrictional strain during Pliocene time along this stretch of the Bangong-Nujiang suture from which the Lamu Co fault emanates. The onset of extension in this region may be explained by crustal thickening and gravitational orogenic collapse, followed by accelerated rifting resulting from localized crustal stretching and increased magmatic activity, potentially driven by the position and northward extent of underthrusting Indian lithosphere.
    Description
    This is the publisher's version, also available electronically from http://onlinelibrary.wiley.com/doi/10.1002/tect.20086/abstract;jsessionid=36D445F6B0A54FA5B74E359605FC0AD1.f04t02
    URI
    http://hdl.handle.net/1808/14622
    DOI
    https://doi.org/10.1002/tect.20086
    ISSN
    0278-7407
    Collections
    • Center for East Asian Studies Scholarly Works [351]
    • Geology Scholarly Works [245]
    Citation
    Kurt E. Sundell. (2013). Evidence for constriction and Pliocene acceleration of east-west extension in the North Lunggar rift region of west central Tibet. Tectonics 32:1454-1479. http://www.dx.doi.org/10.1002/tect.20086

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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