40 Ar/ 39 Ar mineral ages of eclogites from North Shahrekord in the Sanandaj–Sirjan Zone, Iran: Implications for the tectonic evolution of Zagros orogen

2016 ◽  
Vol 37 ◽  
pp. 216-240 ◽  
Author(s):  
Ali Reza Davoudian ◽  
Johann Genser ◽  
Franz Neubauer ◽  
Nahid Shabanian
Keyword(s):  
Tectonic Evolution ◽  
Sanandaj Sirjan Zone ◽  
Zagros Orogen

Evidence for Archean crust in Iran provided by ca 2.7 Ga zircon xenocrysts within amphibolites from the Sanandaj–Sirjan zone, Zagros orogen

2019 ◽  
Vol 332 ◽  
pp. 105390 ◽  
Author(s):  
Farzaneh Shakerardakani ◽  
Xian-Hua Li ◽  
Xiao-Xiao Ling ◽  
Jiao Li ◽  
Guo-Qiang Tang ◽  
...  
Keyword(s):  
Sanandaj Sirjan Zone ◽  
Archean Crust ◽  
Zagros Orogen

scholarly journals Geochemical characteristics and conditions of formation of the Chah-Bazargan peraluminous granitic patches, ShahrBabak, Iran

2017 ◽  
Vol 68 (5) ◽  
pp. 445-463
Author(s):  
Abdolnaser Fazlnia
Keyword(s):  
Trace Elements ◽  
Partial Melting ◽  
Adhesion Force ◽  
High Viscosity ◽  
Metamorphic Complex ◽  
Peraluminous Granites ◽  
Sanandaj Sirjan Zone ◽  
In Situ Crystallization ◽  
Zagros Orogen

Abstract Xenoliths of garnet-biotite-kyanite schist from the Qori metamorphic complex (southern part of the Sanandaj-Sirjan zone, northeast Neyriz, Zagros orogen in Iran) in the 173.0±1.6 Ma Chah-Bazargan leuco-quartz diorite intrusion were studied. This intrusion caused these schist xenoliths to be metamorphosed to the pyroxene hornfels facies (approximately 4.5±1.0 kbar and 760±35 °C), converting them to diatexite migmatite as a result of partial melting of the xenoliths. These melts are granites in composition. Melt volumes of 20 to 30 vol. % were calculated for small patches of the peraluminous granites. It is possible that anatectic melting affected only the leucosome, such that melting was more than 20 to 30 vol. %. It is possible that a large amount of melt was not extracted due to balanced in situ crystallization, the adhesion force between melt and crystal (restite), and high viscosity of the leucosome. The Chah-Bazargan peraluminous granites are depleted in trace elements such as REEs, HFSE (Ti, Zr, Ta, Nb, Th, U, Hf, Y), Ba, Pb, and Sr. These elements are largely insensitive to source enrichment, but sensitive to the amounts of main and accessory minerals. These elements were hosted by minerals such as garnet, biotite, muscovite, K-feldspar, plagioclase, ilmenite, apatite, monazite, and zircon in the source (diatexitic migmatitic xenoliths).

U–Pb age, Hf–O isotopes, and geochemistry of the Sardasht ophiolite in the NW Zagros orogen: Implications for the tectonic evolution of Neo‐Tethys

2020 ◽  
Author(s):  
Songjian Ao ◽  
Qigui Mao ◽  
Morteza Khalatbari‐Jafari ◽  
Brian F. Windley ◽  
Dongfang Song ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
O Isotopes ◽  
Zagros Orogen

scholarly journals Zagros orogeny: a subduction-dominated process

2011 ◽  
Vol 148 (5-6) ◽  
pp. 692-725 ◽  
Author(s):  
P. AGARD ◽  
J. OMRANI ◽  
L. JOLIVET ◽  
H. WHITECHURCH ◽  
B. VRIELYNCK ◽  
...  
Keyword(s):  
Subduction Zones ◽  
Geochemical Evolution ◽  
Iranian Plateau ◽  
Mechanical Coupling ◽  
Sanandaj Sirjan Zone ◽  
History Of ◽  
Zagros Orogen ◽  
Synthetic View ◽  
Subduction System ◽  
Natural Laboratory

AbstractThis paper presents a synthetic view of the geodynamic evolution of the Zagros orogen within the frame of the Arabia–Eurasia collision. The Zagros orogen and the Iranian plateau preserve a record of the long-standing convergence history between Eurasia and Arabia across the Neo-Tethys, from subduction/obduction processes to present-day collision (from ~ 150 to 0 Ma). We herein combine the results obtained on several geodynamic issues, namely the location of the oceanic suture zone, the age of oceanic closure and collision, the magmatic and geochemical evolution of the Eurasian upper plate during convergence (as testified by the successive Sanandaj–Sirjan, Kermanshah and Urumieh–Dokhtar magmatic arcs), the P–T–t history of the few Zagros blueschists, the convergence characteristics across the Neo-Tethys (kinematic velocities, tomographic constraints, subduction zones and obduction processes), together with a survey of recent results gathered by others. We provide lithospheric-scale reconstructions of the Zagros orogen from ~ 150 to 0 Ma across two SW–NE transects. The evolution of the Zagros orogen is also compared to those of the nearby Turkish and Himalayan orogens. In our geotectonic scenario for the Zagros convergence, we outline three main periods/regimes: (1) the Mid to Late Cretaceous (115–85 Ma) corresponds to a distinctive period of perturbation of subduction processes and interplate mechanical coupling marked by blueschist exhumation and upper-plate fragmentation, (2) the Paleocene–Eocene (60–40 Ma) witnesses slab break-off, major shifts in arc magmatism and distributed extension within the upper plate, and (3) from the Oligocene onwards (~ 30–0 Ma), collision develops with a progressive SW migration of deformation and topographic build-up (Sanandaj–Sirjan Zone: 20–15 Ma, High Zagros: ~12–8 Ma; Simply Folded Belt: 5–0 Ma) and with partial slab tear at depths (~10 Ma to present). Our reconstructions underline the key role played by subduction throughout the whole convergence history. We finally stress that such a long-lasting subduction system with changing boundary conditions also makes the Zagros orogen an ideal natural laboratory for subduction processes.

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