Cenozoic kinematic evolution of southwestern Central Iran: Strain partitioning and accommodation of Arabia–Eurasia convergence

Kargaranbafghi, Fariba; Neubauer, Franz; Genser, Johann

doi:10.1016/j.tecto.2010.02.004

Cited by 27 publications

(12 citation statements)

References 56 publications

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“…volcanic activity, as for the UDMA, took place during Eocene time. A stage of extensional tectonic activity, marked by distributed extension and the formation of core-complexes, took place during mid-Eocene time (c. 45 Ma; Verdel et al 2007) and pre-dates later, syn-to post-Oligocene SW-NE shortening (Kargaranbafghi, Neubauer & Genser, 2010).…”

Section: E Central Iran and The Iranian Plateaumentioning

confidence: 99%

“…Paris-Sud, 1987), probably coincident with slow convergence and stagnant steep slab detachment (SB1); (4) Early Eocene compression (?) accompanying the increase in convergence velocities; (5) Middle Eocene extension throughout the whole upper plate (as testified by core-complexes and extensional volcanic basins); extension may be driven by renewed, efficient subduction traction (or, alternatively, by slab break-off below the tiny backarc domains, or both), and could be analogous to the late Mesozoic geodynamics of the eastern border of China (Charles et al 2009); (6) Late Eocene/Early Oligocene contraction (Kargaranbafghi, Neubauer & Genser, 2010), which is broadly coincident with the onset of collision; (7) intensification of shortening from Late Miocene time onwards (10-5 Ma to present).…”

Section: C a Case Study For Upper Plate Deformation In A Subductiomentioning

confidence: 99%

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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: E Central Iran and The Iranian Plateaumentioning

confidence: 99%

Section: C a Case Study For Upper Plate Deformation In A Subductiomentioning

confidence: 99%

Zagros orogeny: a subduction-dominated process

et al. 2011

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“…accretionary" complex is exposed in Anarak and Jandaq areas (Fig. 2) comprises the Morghab schist unit with various schists, the Jandaq high-temperature metamorphic belt with, e.g., staurolite-and sillimanite-bearing schists, amphibolites, and the Arusan ophiolite (Bagheri and Stampfli, 2008); (3) the Biabanak unit with Jurassic and Cretaceous unmetamorphic rocks; (4) the Eocene Chapedony metamorphic core complex with migmatites intruded by Eocene diorite and granite; (5) the overlying Eocene volcanosedimentary succession with conglomerate, andesite, and marls; (6) the Posht-e-Badam metamorphic complex with gneisses and schists, which is overlain by metamorphosed Permian marbles and unmetamorphic Cretaceous red sandstones and limestones; (7) the Boneh Shurow metamorphic complex with gneisses, amphibolites and schists, which are intruded by Triassic granites (Kargaranbafghi et al, 2011(Kargaranbafghi et al, , 2012aMasoodi et al, 2013); (8) the Cambrian Tashk Formation with low-grade metamorphic volcanic and metasedimentary rocks (Masoodi et al, 2013). Locally, in the Polo valley within Polo Mts.…”

Section: Geological Settingmentioning

confidence: 99%

The tectonic evolution of western Central Iran seen through detrital white mica

2015

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“…(Dudash, 2006;Ginat et al, 1998;Kargaranbafghi et al, 2011;Ritter et al, 1995) interpretation, LiDAR ( Figure 2) and DEM analysis, remote sensing techniques, ground truthing via differentially corrected global positioning systems and other ground survey approaches. However, reconstructing these deposits on a morphological basis may prove initially difficult in areas of relatively low relief.…”

Section: Process Of Truncation Summary Citation Glacialmentioning

confidence: 99%

Toe-cut terraces

Larson

Dorn

Faulkner

et al. 2015

Progress in Physical Geography: Earth and Environment

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Alluvial fans and fluvial terraces occur in nearly all climatic settings and often coexist within the same drainage basin. These landforms play an important role in understanding the geomorphic, hydrologic, sedimentologic and erosional histories of a basin. The juxtaposition of fans and fluvial terraces, in some instances, can lead to misinterpretation in distinguishing traditional fluvial terraces from the truncated toe of tributary alluvial fans. This becomes particularly troublesome for those attempting to interpret results from published field studies where fan-cut terrace, truncated alluvial fan, toe-cut alluvial fan, alluvial terrace, and incision of the lower end of a fan piedmont all refer to the same genetic landform. We call for use of the term ''toe-cut terrace'' to represent this landform. We also present criteria to aid in the identification of toe-cut terraces, defined as an abandoned alluvial surface, formed by the truncation of the distal portion of tributary alluvial fans by streams flowing obliquely or perpendicular to the fan surface. Truncation occurs through lateral erosion (''toe-cutting'') or through vertical incision by the trunk drainage lowering the base-level of the alluvial fan. This results in incision into the fan surface abandoning the fan's depositional surface at a higher level above the modern floodplain -a form that often resembles a fluvial terrace. A case study from the Sonoran Desert in central Arizona illustrates a sequence of abandoned alluvial surfaces that resemble fluvial terraces, but use of the proposed criteria reveal the presence of both toe-cut terraces and traditional fluvial terraces formed by the abandonment of the rivers former floodplain.

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Cenozoic kinematic evolution of southwestern Central Iran: Strain partitioning and accommodation of Arabia–Eurasia convergence

Cited by 27 publications

References 56 publications

Zagros orogeny: a subduction-dominated process

Zagros orogeny: a subduction-dominated process

The tectonic evolution of western Central Iran seen through detrital white mica

Toe-cut terraces

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