The Penjwin area, along the zagros suture zone, as an example of collisional orogen

Oweiss, G. A.

doi:10.1016/0040-1951(84)90041-6

Cited by 4 publications

(6 citation statements)

References 15 publications

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“…2) show a complete ophiolite sequence, comprised of pillow lava, sheeted dykes and layered gabbro and show good correlation with the Iran Zagros ophiolite [41][42][43]. [44] proposed this complex as a suture zone between the Arabian and Iranian Plates. The Mawat complex has been considered as an inner belt and as a part of an inner ophiolite belt which have been generated in the mid-oceanic ridge, island arc or supra-subduction zone settings [22,24,26,27,33,[45][46][47][48][49][50][51][52][53].…”

Section: Discussionmentioning

confidence: 99%

Geochemistry and geodynamics of the Mawat mafic complex in the Zagros Suture zone, northeast Iraq

Azizi¹,

Hadi

Asahara

et al. 2013

Open Geosciences

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Abstract:The Iraqi Zagros Orogenic Belt includes two separate ophiolite belts, which extend along a northwest-southeast trend near the Iranian border. The outer belt shows ophiolite sequences and originated in the oceanic ridge or supra-subduction zone. The inner belt includes the Mawat complex, which is parallel to the outer belt and is separated by the Biston Avoraman block. The Mawat complex with zoning structures includes sedimentary rocks with mafic interbedded lava and tuff, and thick mafic and ultramafic rocks. This complex does not show a typical ophiolite sequences such as those in Penjween and Bulfat. The Mawat complex shows evidence of dynamic deformation during the Late Cretaceous. Geochemical data suggest that basic rocks have high MgO and are significantly depleted in LREE relative to HREE. In addition they show positive ε N values (+5 to+8) and low 87Sr/86Sr ratios. The occurrence of some OIB type rocks, high Mg basaltic rocks and some intermediate compositions between these two indicate the evolution of the Mawat complex from primary and depleted source mantle. The absence of a typical ophiolite sequence and the presence of good compatibility of the source magma with magma extracted from the mantle plume suggests that a mantle plume from the D layer is more consistent as the source of this complex than the oceanic ridge or supra-subduction zone settings. Based on our proposed model the Mawat basin represents an extensional basin formed during the Late Paleozoic to younger along the Arabian passive margin oriented parallel to the Neo-Tethys oceanic ridge or spreading center. The Mawat extensional basin formed without creation of new oceanic basement. During the extension, huge volumes of mafic lava were intruded into this basin. This basin was squeezed between the Arabian Plate and Biston Avoraman block during the Late Cretaceous.

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Section: Discussionmentioning

confidence: 99%

Geochemistry and geodynamics of the Mawat mafic complex in the Zagros Suture zone, northeast Iraq

Azizi¹,

Hadi

Asahara

et al. 2013

Open Geosciences

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“…As the collision progressed compression and the intensive degree of shortening led to the "over-passing" of the newly emplaced blocks of the accretionary prism over the old stacking blocks of the Cretaceous obduction. Uplift and shortening due to this collision was responsible for the major deformation observed in the Zagros Suture Zone (Oweiss, 1984). The Zagros Orogenic Belt thus evolved progressively, with continuing shortening with the degree of deformation increasing towards the Zagros Suture Zone.…”

Section: Tectonic Evolution: Discussionmentioning

confidence: 98%

“…The third unit is the Kata Rash Group, of the Cenomanian arc volcano-sedimentary complex of andesite and rhyolite, and the fourth unit consists of Maastrichtian-Paleocene carbonates (Piran Limestone), which occur as isolated thrust sheets over older units. Oweiss (1984) considered this zone to represent an intra-continental shear zone of regionally metamorphosed units. Jassim and Goff (2006) reviewed the tectonic classification of Iraq, hence they put forward the denomination "Zagros Suture Zone" when classifying the allochthonous thrust blocks of the Zagros Orogenic Belt in northern Iraq.…”

Section: Shalair Zone Of the Sanandaj-sirjan Blockmentioning

confidence: 99%

Tectonostratigraphic overview of the Zagros Suture Zone, Kurdistan Region, Northeast Iraq

Al-Qayim¹,

Omer²,

Koyi³

2012

GeoArabia

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The northwestern segment of the Zagros Orogenic Belt of the Kurdistan Region of Iraq includes the Zagros Suture Zone which is consisting of allochthonous Tethyan Triassic–Eocene thrust sheets. The zone is bounded by the Zagros Main Reverse Fault in the northeast, and the Zagros Thrust Front in the southwest. Parts of this zone’s rocks are represented by stacks of thrust megasheets obducted over the autochthonous Cretaceous–Cenozoic sequence of the Arabian Plate margin. Each sheet represents a specific Tethyan tectonostratigraphic facies, and includes (from older to younger): isolated Triassic carbonate platforms (Avroman Limestone), Jurassic carbonate imbricates (Chia Gara, Sargelu and other formations), radiolarites (Qulqula Group), sedimentary mélange (sedimentary-volcanic units of the Qulqula Group), ophiolites (Mawat and Penjwin ultramafics complexes), and Cenozoic fore-arc volcano-sedimentary sequences (Walash Group). Petrography, facies interpretation and lithostratigraphic correlation of these allochthons along four traverses across the Zagros Suture Zone of the examined area indicate that they evolved during the closure of the Neo-Tethys Ocean. Their stacking pattern and tectonic association resulted from two important events: the Late Cretaceous obduction processes, and the Late Miocene–Pliocene collision, uplift, folding and suturing between the Arabian Plate and the Sanandaj-Sirjan Block of Iran. Based on these field observations and by using the model of the Iranian Zagros evolution, a tectonic scenario is proposed to explain the history and evolution of the Zagros Suture Zone in this area.

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“…In NE Iraq, a similar profile may in part be recognized (Oweiss, 1984 (Ricou, 1974) where the radiolarite unit is clearly linked to the stable Arabian Platform by repeated detritals interfingering as early as the Lower Jurassic. The Bisitoun Limestone unit is not seen, but its former presence has been inferred from coarse breccias of Cenomanian age, which presumably originated from the NE.…”

Section: Extension Of the Gondwanan Margin Into Ne Iraq And Iranmentioning

confidence: 90%

The Hezan Units: A Fragment of the South Neo‐tethyan Passive Continental Margin in Se Turkey

Fontaine¹,

Monod

Perinçek³

1989

Journal of Petroleum Geology

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Recent progress in structural and stratigraphic analysis of the allochthonous units situated north of Hazro in the Border Fold zone of SE n r k q has shed light on the nature and signijicance of the Gondwanan margin there. Allochthonous material consists of several superimposed units ranging in age from the Early Trias to the Late Senonian (Hezan units), in which the transition between neritic carbonates and the pelagic and detrital facies is well indicated by an Ammonitico-rosso facies of mid Jurassic age. Above it, ophiolitic material and radiolarites represent the former Tethyan crust and cover. The Hezan units thus belong to the former Gondwanan margin thrust southwards in Lute Cretaceous times. and a tentative reconstruction of its Mesozoic evolution there is facilitated by the absence of later major tectonic events.This reconstruction shows marked diferences compared with the more complex nearby margins described in the Hellenides or Zagrides, where parallel ridges and troughs reflect crustal extension. By contrast, the simple "staircase"geornetry of the present margin is best interpreted as the result of the fracturing of the Gondwanan continent, separating the Apulian and African Plates as early as the Tn'as. 30The Heznn units, SE Turkey

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The Penjwin area, along the zagros suture zone, as an example of collisional orogen

Cited by 4 publications

References 15 publications

Geochemistry and geodynamics of the Mawat mafic complex in the Zagros Suture zone, northeast Iraq

Geochemistry and geodynamics of the Mawat mafic complex in the Zagros Suture zone, northeast Iraq

Tectonostratigraphic overview of the Zagros Suture Zone, Kurdistan Region, Northeast Iraq

The Hezan Units: A Fragment of the South Neo‐tethyan Passive Continental Margin in Se Turkey

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