BIROn - Birkbeck Institutional Research Online

    Insights into the evolution of the Hindu Kush-Kohistan-Karakoram from modern river sand detrital geo- and thermochronological studies

    Zhuang, G. and Najman, Y. and Tian, Y. and Carter, Andrew and Gemignani, L. and Wijbrans, J. and Jan, Q. and Khan, A. (2018) Insights into the evolution of the Hindu Kush-Kohistan-Karakoram from modern river sand detrital geo- and thermochronological studies. Journal of the Geological Society 175 (6), pp. 934-948. ISSN 0016-7649.

    [img]
    Preview
    Text
    jgs2018-Final.pdf - Author's Accepted Manuscript

    Download (1MB) | Preview

    Abstract

    The Hindu Kush-Kohistan-Karakoram region is critical to understanding the long-term accretion history of the south Asian margin pre- and post-India-Asia collision and the impact of these collisions on the development of high topography. However, knowledge about this region remains incomplete due to sparse studies. Here, we present a study comprising detrital zircon U-Pb geochronology, detrital muscovite 40Ar/39Ar thermochronology, and numerical modeling on 40Ar/39Ar dates. The study identifies zircon U-Pb age peaks at 200 Ma, 110–130 Ma, 60–80 Ma, and 28–40 Ma, supporting the polyphase collisions and crustal growth in the south Asian margin. Modeling study reveals fast cooling/erosion at 115–129 Ma, 69–71 Ma, 27–35 Ma, and <8 Ma, which are synchronous with collision related crustal growth, indicating the significant impact of accretion both prior to and post India-Asia collision. This study, along with studies in eastern Karakoram, reveals along-strike variations in erosion and exhumation with young (since late Miocene) intense erosion focusing on the east-central Karakoram. We suggest that this east-west spatial variation in exhumation may have been associated with more intense crustal shortening, and thus the greater crustal thickness, topographic relief and altitude observed in the eastern, compared to western, Karakoram.

    Metadata

    Item Type: Article
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Research Centre: Earth and Planetary Sciences, Institute of
    Depositing User: Andy Carter
    Date Deposited: 13 Jun 2018 09:43
    Last Modified: 27 Jul 2019 09:14
    URI: http://eprints.bbk.ac.uk/id/eprint/22761

    Statistics

    Downloads
    Activity Overview
    57Downloads
    62Hits

    Additional statistics are available via IRStats2.

    Archive Staff Only (login required)

    Edit/View Item Edit/View Item