Defining the southern margin of Avalonia in the Pontides: Geochronological data from the Late Proterozoic and Ordovician granitoids from NW Turkey

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dc.authoridOkay, Aral/0000-0003-2398-5386
dc.authoridBozkurt, Erdin/0000-0003-0592-6438
dc.authoridCrowley, Quentin/0000-0001-9254-6657
dc.contributor.authorOkay, Aral I.
dc.contributor.authorBozkurt, Erdin
dc.contributor.authorSatir, Muharrem
dc.contributor.authorYiğitbaş, Erdinç
dc.contributor.authorCrowley, Quentin G.
dc.contributor.authorShang, Cosmas K.
dc.date.accessioned2025-01-27T20:47:39Z
dc.date.available2025-01-27T20:47:39Z
dc.date.issued2008
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractWe provide new isotopic data from the Pontides, which substantiate the presence of a Cadomian basement with latest Proterozoic granitoids but also show the existence of Ordovician intrusives. Before the opening of the Black Sea, the Pontides formed a Palaeozoic orogenic belt at the margin of the East European Platform (Baltica) in an analogous position to the Variscan terranes in the central Europe. The Pontides consist of three terranes: The Strandja terrane has a Variscan basement with Carboniferous and Permian granitoids and an epicontinental Triassic to Jurassic sedimentary cover. The Istanbul terrane has a Cadomian basement overlain by a sedimentary sequence of Ordovician to Carboniferous age. It underwent contractional deformation during the Late Carboniferous. The Sakarya terrane is characterized by Carboniferous high temperature metamorphism and plutonism. The boundary between the I.stanbul and Sakarya terranes forms a complex tectonic zone several tens of kilometres wide. The new age data come from this boundary zone in the Armutlu peninsula in northwest Turkey. Metagranitoids, which intrude amphibolites in the Armutlu peninsula, give latest Proterozoic and Ordovician U-Pb zircon laser ablation MC-ICP-MS and Pb-Pb evaporation ages. The latest Proterozoic (ca. 570 Ma) granitoids are similar in age to those reported previously from the basement of the Istanbul terrane; they all form part of the widespread Pan-African granitoid plutonism on the margins of Gondwana. The Mid to Late Ordovician granitoids (460 Ma), on the other hand, probably have formed during the rifting of the I.stanbul terrane away from Gondwana during the opening of the Rheic ocean. In terms of the tectonic position, stratigraphy and geological evolution, the I.stanbul and Sakarya terranes are comparable to the Avalonia and the Armorican terrane assemblage in central Europe, respectively. (C) 2008 Elsevier B.V. All rights reserved.
dc.description.sponsorshipNERC [nigl010001] Funding Source: UKRI
dc.identifier.doi10.1016/j.tecto.2008.02.004
dc.identifier.endpage264
dc.identifier.issn0040-1951
dc.identifier.issn1879-3266
dc.identifier.issue1-4
dc.identifier.scopus2-s2.0-48349137764
dc.identifier.scopusqualityQ1
dc.identifier.startpage252
dc.identifier.urihttps://doi.org/10.1016/j.tecto.2008.02.004
dc.identifier.urihttps://hdl.handle.net/20.500.12428/24998
dc.identifier.volume461
dc.identifier.wosWOS:000261510600017
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofTectonophysics
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectPontides
dc.subjectCadomian
dc.subjectOrdovician granitoid
dc.subjectVariscan
dc.subjectI.stanbul terrane
dc.subjectZircon dating
dc.titleDefining the southern margin of Avalonia in the Pontides: Geochronological data from the Late Proterozoic and Ordovician granitoids from NW Turkey
dc.typeArticle

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