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    Late Eocene Uplift of the Al Hajar Mountains, Oman, Supported by Stratigraphy and Low-Temperature Thermochronology

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    Hansman_et_al-2017-Tectonics.pdf
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    Author
    Hansman, Reuben J. cc
    Ring, Uwe cc
    Thomson, Stuart N.
    den Brok, Bas
    Stübner, Konstanze
    Affiliation
    Univ Arizona, Dept Geosci
    Issue Date
    2017-12
    Keywords
    thermochronology
    Oman
    uplift
    mountains
    fission-track
    (U-Th)
    He
    
    Metadata
    Show full item record
    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    Late Eocene Uplift of the Al Hajar Mountains, Oman, Supported by Stratigraphy and Low-Temperature Thermochronology 2017, 36 (12):3081 Tectonics
    Journal
    Tectonics
    Rights
    ©2017. American Geophysical Union. All Rights Reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Uplift of the Al Hajar Mountains in Oman has been related to either Late Cretaceous ophiolite obduction or the Neogene Zagros collision. To test these hypotheses, the cooling of the central Al Hajar Mountains is constrained by 10 apatite (U-Th)/He (AHe), 15 fission track (AFT), and four zircon (U-Th)/He (ZHe) sample ages. These data show differential cooling between the two major structural culminations of the mountains. In the 3km high Jabal Akhdar culmination AHe single-grain ages range between 392 Ma and 101 Ma (2 sigma errors), AFT ages range from 518 Ma to 324 Ma, and ZHe single-grain ages range from 62 +/- 3Ma to 39 +/- 2 Ma. In the 2 km high Saih Hatat culmination AHe ages range from 26 +/- 4 to 12 +/- 4 Ma, AFT ages from 73 +/- 19Ma to 57 +/- 8 Ma, and ZHe single-grain ages from 81 +/- 4 Ma to 58 +/- 3 Ma. Thermal modeling demonstrates that cooling associated with uplift and erosion initiated at 40 Ma, indicating that uplift occurred 30 Myr after ophiolite obduction and at least 10 Myr before the Zagros collision. Therefore, this uplift cannot be related to either event. We propose that crustal thickening supporting the topography of the Al Hajar Mountains was caused by a slowdown of Makran subduction and that north Oman took up the residual fraction of N-S convergence between Arabia and Eurasia.
    Note
    6 month embargo; published online: 4 November 2017
    ISSN
    02787407
    DOI
    10.1002/2017TC004672
    Version
    Final published version
    Sponsors
    Bolin Centre for Climate Research; Royal Swedish Academy of Sciences [GS2015-0002]; Stiftelsen Lars Hiertas Minne [FO2015-0130]; Swedish Foundation for International Cooperation in Research and Higher Education [IB2015-6002]; Stiftelsen Anna-Greta och Holger Crafoords fond; Stockholm University
    Additional Links
    http://doi.wiley.com/10.1002/2017TC004672
    ae974a485f413a2113503eed53cd6c53
    10.1002/2017TC004672
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