Structures and microstructures related to steady-state mantle flow in the Neyriz ophiolite, Iran

Sarkarinejad, Khalil

doi:10.1016/j.jseaes.2004.08.007

Cited by 28 publications

(5 citation statements)

References 42 publications

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“…Ph.D. thesis, Univ. Louis Pasteur de Strasbourg, 2003; for a different interpretation see Sarkarinejad, 2005) and at least partly for Kermanshah too (J. Omrani, unpub. Ph.D. thesis, Institut des Sciences de la Terre, Paris, 2008;Wrobel-Daveau et al 2010;J.…”

Section: B the Crush Zone: The Zagros Suture Zonementioning

confidence: 99%

Zagros orogeny: a subduction-dominated process

et al. 2011

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-This 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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Section: B the Crush Zone: The Zagros Suture Zonementioning

confidence: 99%

Zagros orogeny: a subduction-dominated process

et al. 2011

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“…In Iran, such ophiolites are present south of the Main Zagros Thrust (MZT; Fig. 1), in the Neyriz region (interpreted as resulting from very slow spreading, [3,16,26,31,34] at the foot of the Gondwanian margin [18]) and in the Kermanshah region, overlain by an Eocene volcanic arc [8]. These ophiolites are always in the same structural position, over of a pile of thrusted nappes including tectonic units from the distal part of the Gondwanian margin: ''exotic blocks'' (distal recifal constructions over alkaline volcanoes), radiolarian sheets (slope and basin units) and platform units.…”

Section: Introductionmentioning

confidence: 99%

Significance of Nain-Baft ophiolitic belt (Iran): Short-lived, transtensional Cretaceous back-arc oceanic basins over the Tethyan subduction zone

Moghadam

Whitechurch²,

Rahgoshay

et al. 2009

Comptes Rendus. Géoscience

108

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Four dismembered massifs belonging to the Nain-Baft ophiolitic belt (Central Iran) stretch in a NW-SE direction parallel to the fossil active margin of the Iranian Continental Block (Sanandaj-Sirjan Zone). They are separated by huge transcurrent faults. The Nain, Dehshir, Shahr-e-Babak and Baft massifs are composed of associated slices of harzburgites, small bodies of gabbros and dike swarm complexes, accompanied by various extrusives from basaltic-andesitic lava flows and breccias to dacites and rhyolites. Trace element geochemistry of these lavas displays calc-alkaline and arc-tholeiite signatures, suggesting a back-arc origin for these ophiolites. This is in accordance with the position of these massifs, to the North of the Mesozoic Magmatic Arc crosscutting the Sanadaj-Sirjan Zone. Conventional K-Ar datings on amphibole within amphibolite and gabbros deliver ages between 93 Ma and 67 Ma. These ages are in good agreement with the stratigraphic age of the conformably Cenomanian to Maastrichtian sedimentary cover of the extrusives. The closure of these back-arc basins occurred in the Middle Paleocene as testified by the presence of neritic limestones, sealing all the tectonic contacts. The general geological setting of the Nain-Baft belt suggests that these massifs generated in a transtensional small back-arc basins separated by transcurrent faults. These short-lived transtensional basins result from the oblique subduction of the Tethyan Ocean under the Iranian Continental Block.

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“…They join the Middle Eastern and Mediterranean Hellenides-Dinarides ophiolites (such as Turkish, Troodos, Greek and East European) to more easterly Asian ophiolites (such as Pakistani and Tibetan) [33]. The Neyriz ophiolite, found in a semi-arid environment along the Zargos thrust Zone, SW Iran, is a well-preserved part of the Tethyan oceanic lithosphere [39]. Neyriz ophiolite complex; is located in the north of the Neyriz city; it limits to the eastern Sanandaj-Sirjan zone, and the Bakhtegan Lake to west and the Zagros thrust to south.…”

Section: Geological Settingmentioning

confidence: 99%

Petrology and Geochemistry of Ophiolitic Host Rocks of Copper Mineralization in Dowlat Abad-Tang e Hana Area (Neyriz-Iran)

Attarzadeh¹,

Yazdi²,

Karimi³

et al. 2016

OJG

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Dowlat Abad-Tang e Hana area is a part of Neyriz ophiolite zone, parallel to the Zagros thrust, SW of Iran. It is also a part of obduction thrusting belt over the edge of the Arabian continent during the late Cretaceous. Petrographic investigation indicates the main host rocks are harzburgite, dunite, pyroxenite, basalt, gabbro and pelagic marine sediments. The main magma type of this ophiolite complex is sub-alkaline. The geochemical data of analysed samples show depletion of Na and K, and enrichment in Ca. Copper mineralization in Dowlat Abad-Tang e Hana is hosted mainly in peridotite rocks. The mineralizations are vein type and are associated as copper carbonate (malachite and less azurite). The average of Cu grade is 2.3 wt%. The geochemical and mineralogical data show that the primary source of copper is ortho-magmatic (from ultra-basic rocks and ferro magnesium minerals), which later influenced by hydrothermal processes.

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Structures and microstructures related to steady-state mantle flow in the Neyriz ophiolite, Iran

Cited by 28 publications

References 42 publications

Zagros orogeny: a subduction-dominated process

Zagros orogeny: a subduction-dominated process

Significance of Nain-Baft ophiolitic belt (Iran): Short-lived, transtensional Cretaceous back-arc oceanic basins over the Tethyan subduction zone

Petrology and Geochemistry of Ophiolitic Host Rocks of Copper Mineralization in Dowlat Abad-Tang e Hana Area (Neyriz-Iran)

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