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

Handle URI:
http://hdl.handle.net/10754/609150
Title:
The lithospheric shear-wave velocity structure of Saudi Arabia: Young volcanism in an old shield
Authors:
Tang, Zheng ( 0000-0001-9834-9937 ) ; Julià, Jordi; Zahran, Hani; Mai, Paul Martin ( 0000-0002-9744-4964 )
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.
KAUST Department:
Earth Science and Engineering Program
Citation:
The lithospheric shear-wave velocity structure of Saudi Arabia: Young volcanism in an old shield 2016 Tectonophysics
Publisher:
Elsevier BV
Journal:
Tectonophysics
Issue Date:
11-May-2016
DOI:
10.1016/j.tecto.2016.05.004
Type:
Article
ISSN:
00401951
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).
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0040195116301172
Appears in Collections:
Articles; Earth Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorTang, Zhengen
dc.contributor.authorJulià, Jordien
dc.contributor.authorZahran, Hanien
dc.contributor.authorMai, Paul Martinen
dc.date.accessioned2016-05-12T07:08:36Zen
dc.date.available2016-05-12T07:08:36Zen
dc.date.issued2016-05-11en
dc.identifier.citationThe lithospheric shear-wave velocity structure of Saudi Arabia: Young volcanism in an old shield 2016 Tectonophysicsen
dc.identifier.issn00401951en
dc.identifier.doi10.1016/j.tecto.2016.05.004en
dc.identifier.urihttp://hdl.handle.net/10754/609150en
dc.description.abstractWe 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.en
dc.description.sponsorshipWe 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).en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0040195116301172en
dc.rights© 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectReceiver functionen
dc.subjectJoint inversionen
dc.subjectBulk Vp/Vs ratioen
dc.subjectShear-wave velocitiesen
dc.subjectContinental crusten
dc.subjectSaudi Arabiaen
dc.titleThe lithospheric shear-wave velocity structure of Saudi Arabia: Young volcanism in an old shielden
dc.typeArticleen
dc.contributor.departmentEarth Science and Engineering Programen
dc.identifier.journalTectonophysicsen
dc.eprint.versionPost-printen
dc.contributor.institutionDepartamento de Geofisica, Universidade Federal do Rio Grando do Norte (UFRN), Natal, Brazilen
dc.contributor.institutionNational Center for Earthquakes and Volcanoes, Saudi Geological Survey (SGS), Jeddah, Saudi Arabiaen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorTang, Zhengen
kaust.authorMai, Paul Martinen
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.