NDLI: Crustal thickness variations in the Zagros continental collision zone (Iran) from joint inversion of receiver functions and surface wave dispersion

Content Provider	Springer Nature Link
Author	Tatar, M. Nasrabadi, A.
Copyright Year	2013
Abstract	Variations in crustal thickness in the Zagros determined by joint inversion of P wave receiver functions (RFs) and Rayleigh wave group and phase velocity dispersion. The time domain iterative deconvolution procedure was employed to compute RFs from teleseismic recordings at seven broadband stations of INSN network. Rayleigh wave phase velocity dispersion curves were estimated employing two-station method. Fundamental mode Rayleigh wave group velocities for each station is taken from a regional scale surface wave tomographic imaging. The main variations in crustal thickness that we observe are between stations located in the Zagros fold and thrust belt with those located in the Sanandaj–Sirjan zone (SSZ) and Urumieh–Dokhtar magmatic assemblage (UDMA). Our results indicate that the average crustal thickness beneath the Zagros Mountain Range varies from ∼46 km in Western and Central Zagros beneath SHGR and GHIR up to ∼50 km beneath BNDS located in easternmost of the Zagros. Toward NE, we observe an increase in Moho depth where it reaches ∼58 km beneath SNGE located in the SSZ. Average crustal thickness also varies beneath the UDMA from ∼50 km in western parts below ASAO to ∼58 in central parts below NASN. The observed variation along the SSZ and UDMA may be associated to ongoing slab steepening or break off in the NW Zagros, comparing under thrusting of the Arabian plate beneath Central Zagros. The results show that in Central Iran, the crustal thickness decrease again to ∼47 km below KRBR. There is not a significant crustal thickness difference along the Zagros fold and thrust belt. We found the same crystalline crust of ∼34 km thick beneath the different parts of the Zagros fold and thrust belt. The similarity of crustal structure suggests that the crust of the Zagros fold and thrust belt was uniform before subsidence and deposition of the sediments. Our results confirm that the shortening of the western and eastern parts of the Zagros basement is small and has only started recently.
Starting Page	1321
Ending Page	1337
Page Count	17
File Format	PDF
ISSN	13834649
Journal	Journal of Seismology
Volume Number	17
Issue Number	4
e-ISSN	1573157X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-09-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Crustal structure Iran Zagros Receiver functions Surface wave dispersion Joint inversion Continental collision Geophysics/Geodesy Structural Geology Hydrogeology Geotechnical Engineering & Applied Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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