Prolonged Variscan to Alpine history of an active Eurasian margin (Georgia, Armenia) revealed by 40Ar/39Ar dating

Rolland, Yann; Sosson, Marc; Adamia, Shota; Sadradze, Nino

doi:10.1016/j.gr.2011.05.007

Cited by 86 publications

(82 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1) (e.g. Berberian et al 1981;Majidi 1981;Sengör 1990;Alavi 1991a;Babakhani and Nazer 1991;Eftekharnejad and Asadian 1992;Golonka 2004;Kazmin and Tikhonova 2006;Galoyan et al 2009;Sosson et al 2010;Rolland et al 2011;Sheikholeslami and Kouhpeyma 2012). Here we discuss the evolution of NW Iran and the Lesser Caucasus using new evidence obtained from studies of the Allahyarlu ophiolite.…”

Section: Introductionmentioning

confidence: 76%

“…This created a shallow-water basin between the North Armenian and the South Armenian Blocks called the Sevan-Akera Basin. This basin began opening 165.3 ± 1.7 Ma ago Rolland et al 2011). The Armenian Basin, as a Neotethyan back-arc basin, was an active Andean-type margin during the Middle Jurassic-Lower Cretaceous Kazmin and Tikhonova 2006;Galoyan et al 2009;Rolland et al 2009;Sosson et al 2010;Rolland et al 2011).…”

Section: Late Triassic-early Jurassicmentioning

confidence: 99%

“…Some researchers believe that the Talysh Fault is a transform fault and plays a principal role in paleo-ocean evolution in NW Iran and the Lesser Caucasus Golonka 2004;Kazmin and Tikhonova 2006;Adamia et al 2011). The Talysh Fault formation age is Precambrian (Aghanabati 2004).…”

Section: Geologic Backgroundmentioning

confidence: 99%

“…The Araks Fault is a sinistral strike-slip fault (Alavi 1991b;Barka and Reilinger 1997;Allen et al 2005;Galoyan et al 2009;Sosson et al 2010;Adamia et al 2011). This fault, of NE-SW trend and with its sinistral movements, displaced NW Iran lithologies (Didon and Gemain 1976 The Allahyarlu-Kaleybar-Northern Iran Suture Zone, determined by Late Carboniferous to Triassic metamorphic and ophiolitic exposures, was the western continuation of a branch of the Paleotethys Basin in Iran (Alavi 1991b;Ruttner 1993;Alavi 1996;Ghazi et al 2001;Seyed-Emami 2003;Zanchi et al 2006;Ghavidel-Syooki 2008;Zanchetta et al 2009;Omrani and Moazzen 2010;Sheikholeslami and Kouhpeyma 2012;Shafaii Moghadam et al in press).…”

Section: Geologic Backgroundmentioning

confidence: 99%

“…However, it should be mentioned that the opening-closing ages of the Allahyarlu-Kaleybar-Northern Iran ophiolites is Late Carboniferous to Triassic, respectively, while the opening-closing ages of the Sevan-Akera ophiolites is Middle Jurassic to Lower Cretaceous, respectively. Since the Sevan-Akera ophiolites were formed by Neotethys subduction and at its back-arc basin Rolland et al 2009;Sosson et al 2010;Rolland et al 2011), it is unreasonable to consider the Allahyarlu-Kaleybar Suture Zone as the western continuation of the Sevan-Akera Suture.…”

Section: Geologic Backgroundmentioning

confidence: 99%

See 4 more Smart Citations

Role of the Allahyarlu ophiolite in the tectonic evolution of NW Iran and adjacent areas (Late Carboniferous — Recent)

Ajirlu¹,

Moazzen²

2014

Central European Geology

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 76%

Section: Late Triassic-early Jurassicmentioning

confidence: 99%

Section: Geologic Backgroundmentioning

confidence: 99%

Section: Geologic Backgroundmentioning

confidence: 99%

Section: Geologic Backgroundmentioning

confidence: 99%

See 3 more Smart Citations

Role of the Allahyarlu ophiolite in the tectonic evolution of NW Iran and adjacent areas (Late Carboniferous — Recent)

Ajirlu¹,

Moazzen²

2014

Central European Geology

View full text Add to dashboard Cite

Relict basin closure and crustal shortening budgets during continental collision: An example from Caucasus sediment provenance

et al. 2016

View full text Add to dashboard Cite

Comparison of plate convergence with the timing and magnitude of upper crustal shortening in collisional orogens indicates both shortening deficits (200–1700 km) and significant (10–40%) plate deceleration during collision, the cause(s) for which remains debated. The Greater Caucasus Mountains, which result from postcollisional Cenozoic closure of a relict Mesozoic back‐arc basin on the northern margin of the Arabia‐Eurasia collision zone, help reconcile these debates. Here we use U‐Pb detrital zircon provenance data and the regional geology of the Caucasus to investigate the width of the now‐consumed Mesozoic back‐arc basin and its closure history. The provenance data record distinct southern and northern provenance domains that persisted until at least the Miocene. Maximum basin width was likely ~350–400 km. We propose that closure of the back‐arc basin initiated at ~35 Ma, coincident with initial (soft) Arabia‐Eurasia collision along the Bitlis‐Zagros suture, eventually leading to ~5 Ma (hard) collision between the Lesser Caucasus arc and the Scythian platform to form the Greater Caucasus Mountains. Final basin closure triggered deceleration of plate convergence and tectonic reorganization throughout the collision. Postcollisional subduction of such small (102–103 km wide) relict ocean basins can account for both shortening deficits and delays in plate deceleration by accommodating convergence via subduction/underthrusting, although such shortening is easily missed if it occurs along structures hidden within flysch/slate belts. Relict basin closure is likely typical in continental collisions in which the colliding margins are either irregularly shaped or rimmed by extensive back‐arc basins and fringing arcs, such as those in the modern South Pacific.

show abstract

Early Cretaceous (Albian) intra‐oceanic subduction in northern branch of Neotethys in NW Iran: Zircon U–Pb geochronology and geochemistry of ophiolitic metagabbros from the Chaldoran area

2020

View full text Add to dashboard Cite

The Chaldoran ophiolite in NW Iran and at the Turkish border is a part of the larger Khoy ophiolite. Serpentinized peridotites, pillow basalt, cumulate and isotropic gabbro, pelagic limestone, and radiolarite along with volcano‐sedimentary units are the main rock types in the area. These rocks are mixed together in some places as tectonic and “coloured” mélanges. The gabbro consituent of this ophiolite is either fresh or is metamorphosed up to upper greenschist facies. These meta‐basic rocks contain relatively large crystals of plagioclase and clinopyroxene, partially changed to amphibole. Metamorphic epidote is formed in some samples. Whole‐rock chemistry of these rocks shows a basaltic magmatic composition. Low SiO2 contents along with relatively high MgO and FeOtotal contents testify for a mantle source for the parental magma of the studied samples, intermediate between tholeiitic and calc‐alkaline series. LREE and HFSE are slightly depleted and LILE show enrichment in the studied samples and Ta, Nb, Ti show negative anomalies with respect to MORBs. All chemical features are compatible with a supra‐subduction zone setting for the rocks. The studied rocks are similar to primitive arc and less evolved rocks, geochemically. Also the samples show both MORB‐like magmas, formed at the initial stage of a subduction and IAT chemical features. U–Pb dating of zircons on the gabbro sample gave 107.5 ± 1.3 Ma (Albian) crystallization age. The metabasites from the Chaldoran ophiolite are similar to intra‐oceanic ophiolite‐related igneous rocks from the Zagros suture zone in Iran and NE Iraq and equivalent rocks from the Neotethyan sutures in east Turkey and Armenia and basic rocks from the Late Cretaceous ophiolites of the outer Zagros and Taurus, which are related to the subduction initiation (SI) stage.

show abstract

Prolonged Variscan to Alpine history of an active Eurasian margin (Georgia, Armenia) revealed by 40Ar/39Ar dating

Cited by 86 publications

References 31 publications

Role of the Allahyarlu ophiolite in the tectonic evolution of NW Iran and adjacent areas (Late Carboniferous — Recent)

Role of the Allahyarlu ophiolite in the tectonic evolution of NW Iran and adjacent areas (Late Carboniferous — Recent)

Relict basin closure and crustal shortening budgets during continental collision: An example from Caucasus sediment provenance

Early Cretaceous (Albian) intra‐oceanic subduction in northern branch of Neotethys in NW Iran: Zircon U–Pb geochronology and geochemistry of ophiolitic metagabbros from the Chaldoran area

Contact Info

Product

Resources

About