Geochemistry, zircon U-Pb and Hf isotope for granitoids, NW Sanandaj-Sirjan zone, Iran: Implications for Mesozoic-Cenozoic episodic magmatism during Neo-Tethyan lithospheric subduction

Zhi-yong, Zhang; Xiao, Wenjiao; Ji, Wei‐Qiang; Majidifard, Mahmoud Reza; Rezaeian, Mahnaz; Talebian, Morteza; Xiang, Dunfeng; Chen, Ling; Wan, Bo; Ao, Songjian; Esmaeili, Rasoul

doi:10.1016/j.gr.2018.04.002

Cited by 74 publications

(70 citation statements)

References 76 publications

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“…The decrease in shear strength along the low‐velocity decoupling zone may partly be explained by the release of water from underplated sediments into the upper crust and long‐lasting progressive shearing since the onset of underthrusting, as well as local partial melting in the lower crust; a similar scenario has also been suggested for the Himalaya suture zone (Nábělek et al, ). In the northern Zagros, precollisional and syncollisional magmatism affected the southern edge of Central Iran (e.g., Azizi et al, ; Zhang et al, ), leading to an anomalously higher temperature of Central Iranian lithosphere which might play a notable role in developing the low shear strength decoupling zone during the underthrusting process (Motaghi, Shabanian, & Kalvandi, ). Furthermore, the large seismic moment release in the Zagros Mountains and aseismic behavior of southern margin of Central Iran (Figure ; Talebian & Jackson, ) characterized by low rate of active deformation is consistent with the low strength characteristics of this shear zone.…”

Section: Discussionmentioning

confidence: 99%

Crustal Scale Imaging of the Arabia‐Central Iran Collision Boundary Across the Zagros Suture Zone, West of Iran

Dashti

Lucente

Motaghi

et al. 2020

Geophysical Research Letters

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We calculate seismic velocity structure of the north Zagros suture zone, west Iran, to resolve the crustal features at the boundary of Arabian-Central Iranian collision. We compute teleseismic receiver functions (RFs) for 46 stations along a transect crossing the suture. Through harmonic analysis and inversion of the RF data, we obtain information on the characteristics of the suture zone at depth. The RFs and their harmonics show a low angle NE dipping boundary between the overriding layer and a midcrustal low velocity zone, which corresponds to the suture zone. The overriding high velocity feature (Vs~3.8 km/s) is interpreted as an intermediate depth crustal complex exhumed close to the surface through imbricate thrust faulting and enhanced by crustal buoyancy due to continental underthrusting. Significant anisotropy is found above and below the suture zone: We interpret it in terms of slow-symmetry-axis anisotropy and derive clues on the ongoing deformation processes.

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Section: Discussionmentioning

confidence: 99%

Crustal Scale Imaging of the Arabia‐Central Iran Collision Boundary Across the Zagros Suture Zone, West of Iran

Dashti

Lucente

Motaghi

et al. 2020

Geophysical Research Letters

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“…Deformation and metamorphism in the convergent plate boundary caused to superimposition of the different phases of deformation and propagated the complex structural pattern, In the study area collisional event of the Neo-Tethys followed by the magmatic body intrusion (Azizi et al, 2018;Zhang et al, 2018; and development of complex structures, consists of: foliation, ductile shear zone, and brittle structures such as conjugated fault, fractures and veins. The deformation history of study area can be classified into three stage.…”

Section: Structural Elementsmentioning

confidence: 94%

Constraining of strain ellipsoid shape from sectional data in the Au bearing shear zone west of Iran

Behyari¹

2019

Acta Geodynamica Et Geomaterialia

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Ductile shear zone recorded valuable data about the progressive deformation and geodynamic setting of the earth crust. Analysis of the strain ratio on the deformed quartz grains in the samples of the Zagros orogenic shear zone indicated generally most of the strain ellipsoids shape are prolate and developed under constructional strain regime. Principal axes of the strain ellipticity ratio varied in the range between 2.04 to 3.12, shear strain magnitude analysis indicated ε s are between 0.6 to 1.3. Strain ellipsoid shape also revealed the propagation of the shear zone could not be coeval with the continental collision because in the collision region expected the ellipsoid shape to be oblate. Flattening strain regime in the Zagros Orogeny contemporaneous with the collisional event (D1 phase) and widespread in the Sanandaj-Sirjan Metamorphic Zone. Constructional conditions and prolate strain ellipsoid could be related to the post-collisional deformation phase (D2 phase). In this event stretching and shearing localized in the ductile shear zone and transtension structures superimposed on the former transpression structures. The deformation followed by third phase and brittle event (D3 phase) and caused to the propagation of veins. These veins somewhere cut the foliation and in the other place are parallel to foliation plane.

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“…The tectonostratigraphy of this zone includes the Paleozoic to the Cretaceous sedimentary and metamorphic rocks, which thrust on ZFTB (Alavi, 1991;Agard et al, 2011;Mouthereau et al, 2012). The evidence of the Neo-Tethys oceanic crust subduction initiation to final closure recorded in this region and characterized by the poly-deformed metamorphic rock units that affected with deformed and undeformed plutons (Allen and Amstrong, 2008;Rezaei Azizi et al, 2018a;Zhang et al, 2018). The age of plutonism in the study district varied in a wide range that is one of the controversial subjects in the Zagros geodynamic evolution history.…”

Section: Geodynamics and Geological Settingmentioning

confidence: 97%

“…The first set is the Upper Neoproterozoic-Cambrian age intrusion that emplaced during proto-Tethys postcollisional magmatic activity (Hassanzadeh et al, 2008;Moghadam et al, 2015;Badr et al, 2018). The second set is the Jurassic plutons that are affinities to the initial subduction of the Neo-Tethys oceanic crust or development of slab window in the subduction zone (Azizi et al, 2015;Zhang et al, 2018), and the youngest set intruded in the Paleocene-Eocene as a result of ridge spreading in the collision zone (Zhang et al, 2018). This plutonism in the different stages act as thermal engines for propagation of metamorphism, deformation and the mineralization.…”

Section: Geodynamics and Geological Settingmentioning

confidence: 99%

“…Continuity of northward movement of the Arabian plate caused to increase structural deformation and permeability of host rocks (Vernant et al, 2004;Djamour et al, 2011). The magmatic activities in the UDMA acted as a thermal source of hydrothermal fluids, which usually associated with considerable ore mineralization (Hassanzadeh et al, 2008;Zarasvandi et al, 2014;Zhang et al, 2018;Behyari and Shahbazi, 2019). The host rock structures had an essential role in the emplacement of ore bodies in this region.…”

Section: Introductionmentioning

confidence: 99%

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The role of the structures on the fluorite mineralization: Insight to fluid inclusion and alteration map of the Laal-kan fluorite deposit, NW Iran

Behyari¹

2020

Acta Geodynamica Et Geomaterialia

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Fluorite mineralization is controlled by the multiple geological processes such as structural control, geochemical characterization of hydrothermal fluids, temperature and depth. The mineralization associated with the alteration of the host rocks and trapping of fluid in the host rock crystallographic defects. Alteration in the host rocks due to circulation of hydrothermal fluids and several techniques were applied to discriminate the associated alterations in fluorite deposition using the ASTER images. The resulting images indicated that the fluorite mineralization in the studied area accompanied by propylitic and phyllic alterations. The results of micro-thermometry analysis of the fluorite hosted fluid inclusions indicated that the maximum homogenization temperature was 253 °C. These data implies that the temperature of hydrothermal fluids probably had an essential role in the propagation of the alteration zones. The depth versus homogenization temperature diagram for fluorite mineralization in the studied district revealed that the depth of fluorite mineralization varies between 33 to 256 m. Two fluorite generations were distinguishing in the study district. The first generation is characterized by high salinity (18-25 wt.% NaCl) which developed on the deeper level and along the fault zone. The second generation is characterized by low salinity (6-13 wt.% NaCl) on shallow depth and deposited in the fractures. The results revealed that fluorite deposition was not contemporaneous with host rock deformation and deposited in the late-stage deformation phase.

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Geochemistry, zircon U-Pb and Hf isotope for granitoids, NW Sanandaj-Sirjan zone, Iran: Implications for Mesozoic-Cenozoic episodic magmatism during Neo-Tethyan lithospheric subduction

Cited by 74 publications

References 76 publications

Crustal Scale Imaging of the Arabia‐Central Iran Collision Boundary Across the Zagros Suture Zone, West of Iran

Crustal Scale Imaging of the Arabia‐Central Iran Collision Boundary Across the Zagros Suture Zone, West of Iran

Constraining of strain ellipsoid shape from sectional data in the Au bearing shear zone west of Iran

The role of the structures on the fluorite mineralization: Insight to fluid inclusion and alteration map of the Laal-kan fluorite deposit, NW Iran

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