Elements de continuite entre le Zagros et la Turquie du Sud-Est

Braud, Jean; Ricou, Luc-Emmanuel

doi:10.2113/gssgfbull.s7-xvii.6.1015

Cited by 17 publications

(14 citation statements)

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“…(a) Early Tertiary magmatic and sedimentary rocks, independant from the above ophiolite body, which can be traced up to Northern Turkey (Braud and Ricou 1975 Braud 1987; this study) and epicontinental AquitanoBurdigalian limestones (analogous to the ZFB Asmari and Central Iran Qom Formations, respectively) resting unconformably upon all the above units (Fig. 3).…”

Section: Geological Settingmentioning

confidence: 99%

Convergence history across Zagros (Iran): constraints from collisional and earlier deformation

Agard

Omrani

Jolivet

et al. 2005

Int J Earth Sci (Geol Rundsch)

853

619

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The Zagros orogen provides a unique opportunity within the Alpine system to evaluate the interplay between a young Tertiary collision and earlier subduction/obduction processes. Within the Crush zone and the Sanandaj-Sirjan (internal) zone separating the Zagros Fold belt from Central Iran, we document several major tectonic events taking place at the end of the Cretaceous, of the Eocene and from the Mio-Pliocene onwards (ca. <20-15 Ma). Contrary to recent interpretations, our data (cross-sections and description of the overall deformation style) strongly suggest that the Main Zagros Thrust (MZT) is deeply rooted, possibly to Moho depths, and that the suture zone effectively runs along the MZT. Field observations show that the final resorption of the oceanic domain took place slightly after 35 Ma and that collision must have started before ca. 23-25 Ma in northern Zagros. The shortening rate across the Crush zone since the Mid-Miocene (20-15 Ma) is estimated at a minimum 3-4 mm/year. Shear movements in the Crush zone during the EoceneOligocene period and extensional/strike-slip movements in the internal zones during the late Cretaceous point to an oblique setting early in the convergence history. A geotectonic scenario for convergence from the time of obduction to the present is finally proposed.

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Section: Geological Settingmentioning

confidence: 99%

Convergence history across Zagros (Iran): constraints from collisional and earlier deformation

Agard

Omrani

Jolivet

et al. 2005

Int J Earth Sci (Geol Rundsch)

853

619

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“…These metamorphic rocks are unconformably overlain by Barremian-Aptian Orbitolina limestones, typical of sedimentation in Central Iran (Stocklin 1968). These limestones are covered by Palaeocene-Eocene submarine basalts, followed by Alveolina marls, pelagic limestone, and LutetianPriabonian flysch deposits of Iranian affinity (Braud & Ricou 1975). During most of the second half of the Mesozoic era, the Sanandaj-Sirjan Metamorphic Zone represented an active continental margin (Berberian & King 1981;Berberian et al 1982;Sengor 1990;Agard et al 2005).…”

Section: Present-day Structural Unitsmentioning

confidence: 99%

Brittle tectonic reconstruction of palaeo-extension inherited from Mesozoic rifting in West Zagros (Kermanshah, Iran)

Navabpour

Angelier²,

Barrier

2011

JGS

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The present-day Zagros mountain belt of SW Iran corresponds to the former Arabian passive continental margin of the southern Neo-Tethyan basin, which existed since a Permian–Triassic rifting episode and underwent later collisional deformation in mid- to late Cenozoic time. In West Zagros, the Kermanshah Radiolarian Trough, separated from the Neo-Tethyan basin by the narrow continental platform of the Bisotun Limestone, resulted from the Triassic–Jurassic rifting of the passive margin. Brittle tectonic analyses of syndepositional normal fault slip data have been undertaken to study the extensional history of the passive margin in terms of palaeostress reconstruction. Dominant east–west trends of the inherited rift-related normal faults in West Zagros indicate an approximately north–south trend of extension that prevailed during the entire Mesozoic syn- to post-rift evolution of the radiolarian trough. This extension characterizes a stretched continental margin similar to the present-day passive margin of the British Isles. Considering the structural pattern of the inherited basement faults, as revealed by the present-day earthquake focal mechanisms, an oblique crustal stretching model is proposed for the rifting process.

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“…Various models have been proposed, involving one, two or more oceans between the Pontic and Arabian margins (Smith 1971;Dewey et al 1973;Ricou et al 1975;Biju-Duval et al 1977;~eng6r & Yilmaz 1981;Ozkaya 1982 a, b). In this paper we discuss interpretations of the Tauric subduction event based on the well-documented Malatya transect.…”

mentioning

confidence: 99%

“…Small alkaline granitic bodies are seen near Keban, dated at 78 Ma. Ricou et al (1975) proposed that the Keban marbles were thrust from north to south on to the Munzur Da~ limestones, together with the ophiolites of this area. However, Ozgiil (1981) and two of us (A.M., E.Y.)…”

mentioning

confidence: 99%

Tauric subduction (Malatya-Elazıǧ provinces) and its bearing on tectonics of the Tethyan realm in Turkey

Michard

Whitechurch

Ricou

et al. 1984

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Summary In the Eastern Taurus, The Elazıǧ nappes shown an ophiolitic association overlain by andesites and intruded by calc-alkalic granites, both of Late Cretaceous age. The basin was compressed in the Late Cretaceous between two metamorphic massifs each with a sialic basement and platform-type Permian to Mesozoic cover. This history indicates Late Cretaceous subduction under the Taurides and subsequent compression of the basin and arc. Attempts to place this Tauric subduction in the geodynamic history of Turkey lead to conflicting interpretations and two alternative models are presented. The first involves a single Tethyan ocean subducting northwards below the Pontides and southwards below the Taurides. The latter led to the Late Cretaceous opening of back-arc basins which split the formerly continuous Tauric-Arabian platform. Southward subduction ended when the ridge reached the trench, leading to compression of the Elazıǧ back-arc basin, southward obduction and closure of the ocean. The residual, Upper Cretaceous marginal basin controlled the subsequent Tertiary development of the area. The second model involves a northern Tethyan ocean and a southern Mesogean ocean, both subducting northwards. Subduction of the southern ocean generated calc-alkaline magmatism and deformation of the leading edge of the Tauric blocks. The Elazıǧ basin closed as a result, having earlier formed either as a subduction-related marginal basin or as a pre-existing extensional basin. Southward obduction took place from both oceans. After closure of the Tethyan ocean, Tertiary development was controlled by reactivation of Mesogean subduction.

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Elements de continuite entre le Zagros et la Turquie du Sud-Est

Cited by 17 publications

References 0 publications

Convergence history across Zagros (Iran): constraints from collisional and earlier deformation

Convergence history across Zagros (Iran): constraints from collisional and earlier deformation

Brittle tectonic reconstruction of palaeo-extension inherited from Mesozoic rifting in West Zagros (Kermanshah, Iran)

Tauric subduction (Malatya-Elazıǧ provinces) and its bearing on tectonics of the Tethyan realm in Turkey

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