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    The lithospheric shear-wave velocity structure of Saudi Arabia: Young volcanism in an old shield

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    Type
    Article
    Authors
    Tang, Zheng cc
    Julià, Jordi
    Zahran, Hani
    Mai, Paul Martin cc
    KAUST Department
    Computational Earthquake Seismology (CES) Research Group
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-05-11
    Online Publication Date
    2016-05-11
    Print Publication Date
    2016-06
    Permanent link to this record
    http://hdl.handle.net/10754/609150
    
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    Abstract
    We investigate the lithospheric shear-wave velocity structure of Saudi Arabia by conducting H-κ stacking analysis and jointly inverting teleseismic P-receiver functions and fundamental-mode Rayleigh wave group velocities at 56 broadband stations deployed by the Saudi Geological Survey (SGS). The study region, the Arabian plate, is traditionally divided into the western Arabian shield and the eastern Arabian platform: The Arabian shield itself is a complicated mélange of crustal material, composed of several Proterozoic terrains separated by ophiolite-bearing suture zones and dotted by outcropping Cenozoic volcanic rocks (locally known as harrats). The Arabian platform is primarily covered by 8 to 10 km of Paleozoic, Mesozoic and Cenozoic sedimentary rocks. Our results reveal high Vp/Vs ratios in the region of Harrat Lunayyir, which are interpreted as solidified magma intrusions from old magmatic episodes in the shield. Our results also indicate slow velocities and large upper mantle lid temperatures below the southern and northern tips of the Arabian shield, when compared with the values obtained for the central shield. We argue that our inferred patterns of lid velocity and temperature are due to heating by thermal conduction from the Afar plume (and, possibly, the Jordan plume), and that volcanism in western Arabia may result from small-scale adiabatic ascent of magma diapirs.
    Citation
    The lithospheric shear-wave velocity structure of Saudi Arabia: Young volcanism in an old shield 2016 Tectonophysics
    Sponsors
    We are grateful to Mahmoud Salam, Wael Raddidi and the team at Saudi Geological Survey (SGS) for providing the broadband seismic data. We also thank Sung-Joon Chang and an anonymous reviewer for their constructive comments, which helped greatly in improving the manuscript. The research presented in the paper is supported by the cooperation between Saudi Geological Survey (SGS) and King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Tectonophysics
    DOI
    10.1016/j.tecto.2016.05.004
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0040195116301172
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.tecto.2016.05.004
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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