Silurian to Early Devonian arc magmatism in the western Sakarya Zone (NW Turkey), with inference to the closure of the Rheic Ocean

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dc.authoridKarsli, Orhan/0000-0002-2904-6227
dc.authoridDokuz, Abdurrahman/0000-0002-7518-2772
dc.authoridKANDEMIR, RAIF/0000-0002-0344-9159
dc.contributor.authorKarsli, Orhan
dc.contributor.authorSengun, Firat
dc.contributor.authorDokuz, Abdurrahman
dc.contributor.authorKandemir, Raif
dc.contributor.authorAydin, Faruk
dc.contributor.authorAndersen, Tom
dc.date.accessioned2025-01-27T20:49:50Z
dc.date.available2025-01-27T20:49:50Z
dc.date.issued2020
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThe Rheic Ocean is the most significant Paleozoic ocean that detached peri-Gondwana terranes from the northern Gondwana margin throughout the closure of the Iapetus Ocean. The suture of the Rheic Ocean spreads from Mexico to the Middle East, and the timing of its final closure is well-documented by the rocks formed in the Variscan-Alleghanian-Ouachita orogeny which led to the formation of the supercontinent Pangaea. However, as robust paleomagnetic and quantitative data are mostly lacking, the onset and evolution of the subduction of the Rheic Ocean are highly speculative, and they require further confirmation. Recently, the well-preserved metagranitoids along the western Sakarya Zone (SZ) in Anatolia have been identified, and they provide new data that improve our knowledge on the evolution of the Early Paleozoic Rheic Ocean along the northern Gondwana. Here, we present new geochronological, in situ zircon Hf isotope, and whole-rock geochemical analyses of these metagranitoids from the western SZ to enhance our understanding of the subduction processes of the Rheic Ocean. IA-ICP-MS zircon U-Pb dating demonstrated that the Boziiyuk and Borcak metagranitoids from the western SZ were emplaced during the Silurian to Early Devonian (431 +/- 2.7 to 403 +/- 3.5 Ma). The both granitoids have medium- to high-K. calc-alkaline magmatic character, and exhibit peraluminous to slightly metaluminous geochemical signature. They show a typical arc pattern in terms of trace elements and have a uniform, moderate negative epsilon(Hf) (t) of -3.2 to -9.7, with Mesoproterozoic Hf depleted mantle model ages (T-DM1 = 12 to 1.4 Ga). The geochemical and isotopic characteristics are not consistent with those of depleted mantle melts and melts derived from the crustal rocks in an intracontinental environment. Instead, the parental magma is likely generated from the partial melting of a homogeneous and enriched mantle wedge source. We propose that the Silurian to Early Devonian arc-related magmatism is associated with a northward subduction episode of the Rheic Oceanic lithosphere beneath the peri-Gondwana terranes. Hence, we consider that the opening of Paleotethys Ocean formed in a back-arc basin of subduction in Andean style to the north rather than a continental rift to the south in response to south-directed and short-lived supra-subduction zone (SSZ)-type subduction during the Silurian to Early Devonian. (C) 2020 Elsevier B.V. All rights reserved.
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [119Y079]
dc.description.sponsorshipWe appreciate the Scientific and Technological Research Council of Turkey (TUBITAK) that financially supported this study by a project with grant #119Y079. We thank Mehdi Ilhan and Emrah Yildiz for their efforts during the zircon separations and field works. We also thank Prof. Dr. Michael Roden for his editorial handling, and two anonymous reviewers for their constructive comments.
dc.identifier.doi10.1016/j.lithos.2020.105641
dc.identifier.issn0024-4937
dc.identifier.issn1872-6143
dc.identifier.scopus2-s2.0-85087353239
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.lithos.2020.105641
dc.identifier.urihttps://hdl.handle.net/20.500.12428/25327
dc.identifier.volume370
dc.identifier.wosWOS:000558896300026
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofLithos
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectRheic Ocean
dc.subjectMantle wedge
dc.subjectSilurian metagranitoids
dc.subjectArc-type magmatism
dc.subjectWestern Sakarya Zone
dc.subjectBilecik area
dc.subjectNW Turkey
dc.titleSilurian to Early Devonian arc magmatism in the western Sakarya Zone (NW Turkey), with inference to the closure of the Rheic Ocean
dc.typeArticle

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