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Crustal density structure of the northwestern Iranian Plateau

Vahid Teknik, Abdolreza Ghods, Hans Thybo and Irina M. Artemieva
Crustal density structure of the northwestern Iranian Plateau (in Understanding tectonic processes and their consequences; a tribute to A. M. Celal Sengor; Part 2, John F. Dewey (editor) and Ali Polat (editor))
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (December 2019) 56 (12): 1347-1365

Abstract

We present a new 2D crustal-scale model of the northwestern Iranian plateau based on gravity-magnetic modeling along the 500 km long China-Iran Geological and Geophysical Survey in the Iranian plateau (CIGSIP) seismic profile across major tectonic provinces of Iran from the Arabian plate into the South Caspian Basin (SCB). The seismic P-wave receiver function (RF) model along the profile is used to constrain major crustal boundaries in the density model. Our 2D crustal model shows significant variation in the sedimentary thickness, Moho depth, and the depth and extent of intra-crustal interfaces. The Main Recent Fault (MRF) between the Arabian crust and the overriding central Iran crust dips at approximately 13 degrees towards the northeast to a depth of about 40 km. The geometry of the MRF suggests about 150 km of underthrusting of the Arabian plate beneath central Iran. Our results indicate the presence of a high-density lower crustal layer beneath Zagros. We identify a new crustal-scale suture beneath the Tarom valley between the South Caspian Basin crust and Central Iran and the Alborz. This suture is associated with sharp variation in Moho depth, topography, and magnetic anomalies, and is underlain by a 20 km thick high-density crustal root at 35-55 km depth. The high-density lower crust in Alborz and Zagros may be related to partial eclogitization of crustal roots below about 40 km depth. The gravity and magnetic models indicate a highly extended continental crust for the SCB crust along the profile. Low observed magnetic susceptibility of the Kermanshah ophiolites likely indicates that the ophiolite rocks only form a thin layer that has been thrust over the sedimentary cover.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 56
Serial Issue: 12
Title: Crustal density structure of the northwestern Iranian Plateau
Title: Understanding tectonic processes and their consequences; a tribute to A. M. Celal Sengor; Part 2
Author(s): Teknik, VahidGhods, AbdolrezaThybo, HansArtemieva, Irina M.
Author(s): Dewey, John F.editor
Author(s): Polat, Alieditor
Affiliation: Institute for Advanced Studies in Basic Sciences, Department of Earth Sciences, Zanjan, Iran
Affiliation: University of Oxford, University College, Oxford, United Kingdom
Pages: 1347-1365
Published: 201912
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 78
Accession Number: 2020-007212
Categories: Solid-earth geophysicsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. sects., geol. sketch maps
N33°00'00" - N37°00'00", E46°00'00" - E50°00'00"
Secondary Affiliation: Istanbul Technical University, TUR, TurkeyUniversity of Copenhagen, DNK, Denmark
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from Canadian Science Publishing, NRC Research Press, Ottawa, ON, Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2020
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