Crustal thickness variation across the northeast Iran continental collision zone from teleseismic converted waves

Motaghi, Khalil; Tatar, M.

doi:10.1007/s10950-011-9267-2

Cited by 21 publications

(18 citation statements)

References 13 publications

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“…In the Middle East the strongest SKS‐splitting is observed in regions of thin lithosphere and little or no splitting occurs in the region of the thick lithosphere below the Zagros orogen (Figure 8). We have only an upper bound of ∼120 km on the lithospheric thickness in the central Iranian Plateau where receiver function measurements show the crust is 40–45 km thick [ Nowrouzi et al , 2007; Rham , 2009; Motaghi et al , 2011, 2012]. Therefore, the thickness of the mantle layer of the lithosphere is probably <70 km.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…The S‐delays computed for the surface wave tomographic model show a similar SW‐to‐NE trend in delay time with early arrivals in the Zagros as do the observed S‐wave residuals uncorrected for crustal structure. After correcting the S‐wave residuals for lateral variations in crustal thickness and velocity along the profile (Figure 5d) by using results from crustal receiver function inversions [ Nowrouzi et al , 2007; Rham , 2009; Motaghi et al , 2011, 2012], we found much earlier arrival times for stations in the Zagros (∼−4 sec), ones that are suppressed in Figure 5cdue to the thick (50–55 km) and somewhat slower Zagros crust compared to that in central Iran (35–40 km). The IIEES‐LGIT and IIEES‐UCam experiments were operated at different times and have no sites in common.…”

Section: Upper Mantle Shear Wave Structure Of the Middle Eastmentioning

confidence: 99%

“…) data recorded during the 2000-2001 IIEES-LGIT experiment [Paul et al, 2006] and the 2006-2008 IIEES-UCam experiments[Nowrouzi et al, 2007;Rham, 2009;Motaghi et al, 2011Motaghi et al, , 2012. Sites occupied in the IIEES-LGIT experiment extend from the edge of the Zagros foreland basin in the southwest, across the Zagros fold-and-thrust belt, the Sanandaj-Sirjan volcanic arc and to the Urumich-Dokhtar magmatic arc to the edge of the central plateau(Figure 1).…”

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confidence: 99%

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The Zagros core: Deformation of the continental lithospheric mantle

Priestley

McKenzie

Barron

et al. 2012

Geochem Geophys Geosyst

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[1] The Zagros of Iran form one of the youngest collisional orogenic belts on Earth. At shallow depths, shortening across the Zagros is accommodated by folding in the sediments, high-angle thrust faulting in the basement and thickening of the lower crust, but how shortening is accommodated by the lithospheric mantle has been uncertain largely because the upper mantle seismic structure has been poorly known. We map the lateral variations in upper mantle shear wave speed beneath this region using a large, multimode surface wave data set. The upper mantle is slow for most of the Middle East, but a high shear wave speed lid extending to $225 km depth exists beneath the Zagros. We use a T(V s , z) relation to convert the shear wave speed profiles to temperature profiles and fit these with geotherms to identify the base of the lithosphere. The upper mantle temperatures from the seismic model are consistent with temperatures derived from geochemical modeling. The lithosphere is less than $120 km thick over the region except for a thick lithospheric root beneath the Zagros, implying that shortening in the mantle is accommodated by lithospheric thickening. The composition of the volcanic rocks from above the area of the thickened lithosphere has depleted magma source regions with densities $60 kg m À3 less than the MORB source. Elsewhere in the Middle East the volcanic source regions have compositions and densities similar to that of MORB. The shortening across the Zagros is accommodated by lithospheric thickening but the cool thickened lithosphere has been stabilized from delamination by depletion.Components: 6600 words, 8 figures.

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Upper Mantle Shear Wave Structure Of the Middle Eastmentioning

confidence: 99%

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The Zagros core: Deformation of the continental lithospheric mantle

Priestley

McKenzie

Barron

et al. 2012

Geochem Geophys Geosyst

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“…Central Iran, show a rather simple structure compared with those obtained from stations that are located over the mountain ranges. Some examples of the calculated PRFs are given by Motaghi et al (2012a).…”

Section: -1-calculation Of P-wave Receiver Function (Prf)mentioning

confidence: 99%

“…The crustal thickness is large beneath Zagros (~50 km) and it increases beneath SSZ and UDMA where it reaches its maximum ~59 km. To the north, a smooth decrease is seen at the south and middle of Central Iran, reaching its local minimum at the middle of Central Iran, ~35 km Motaghi et al (2012a). A C C E P T E D M A N U S C R I P T used a migration method described byZhu and Kanamori (2000) to migrate P-to-S converted waves from the Moho boundary (extracted from stacked PRFs) to the Moho depth and report an even thinner crust ~ 27.5 km.…”

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The deep structure of the Iranian Plateau

et al. 2015

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High resolution structures of the lithosphere-asthenosphere system beneath a seismic profile in Iran are obtained by the simultaneous inversion of data from receiver functions and fundamental mode Rayleigh wave group velocity and validated by modeling Bouguer gravity anomaly data. The seismic data are gathered over a profile extending across Zagros, Sanandaj-Sirjan Zone (SSZ), Urumieh-Dokhtar magmatic arc (UDMA), Central Iran, Alborz-Binalud Mountain ranges and Kopeh Dagh Mountain ranges. The results confirm the presence of crustal roots at the north and south of Iranian Plateau where it meets the Arabian Plate and Eurasia. The high velocity lithosphere of the Arabian Plate gently plunges NNE-ward beneath Central Iran supporting the subduction of the continental lithosphere responsible for the seismicity of the area. The crust and lithosphere are thinner beneath Central Iran, where two low velocity structures are very likely related to magma sources of the UDMA and in east of Iran, around Lut block, where the volcanism shows calcalkaline subduction-related geochemistry. The crustal-lithospheric root to the north of the Iranian Plateau may represent the relict of a previous "cimmeric" subduction zone. Therefore the Iranian lithosphere-asthenosphere system could be the result of the coalescence of two separate subduction zones. © 2014 International Association for Gondwana Research

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Geological Setting and Crustal Structure of Iran

Ghorbani

2021

Earth and Environmental Sciences Library

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Crustal thickness variation across the northeast Iran continental collision zone from teleseismic converted waves

Cited by 21 publications

References 13 publications

The Zagros core: Deformation of the continental lithospheric mantle

The Zagros core: Deformation of the continental lithospheric mantle

The deep structure of the Iranian Plateau

Geological Setting and Crustal Structure of Iran

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