Early Cambrian S-type granites in the Sakarya Zone, NE Turkey: A record for transition from subduction to post-collisional extension deduced from U-Pb zircon age and Nd-Hf isotopes

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dc.authoridSantos, Jose Francisco/0000-0003-4997-8264
dc.authoridKarsli, Orhan/0000-0002-2904-6227
dc.authoridDokuz, Abdurrahman/0000-0002-7518-2772
dc.contributor.authorKarsli, Orhan
dc.contributor.authorSengun, Firat
dc.contributor.authorDokuz, Abdurrahman
dc.contributor.authorAydin, Faruk
dc.contributor.authorKandemir, Raif
dc.contributor.authorKristoffersen, Magnus
dc.contributor.authorSantos, Jose Francisco
dc.date.accessioned2025-01-27T20:50:16Z
dc.date.available2025-01-27T20:50:16Z
dc.date.issued2022
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractCadomian realms have recently received much attention in the Alpine-Mediterranean orogenic belts, with discontinuous outcrops extending from the Alps to the Istanbul Zone, Menderes Massif, Taurides in Turkey and Iran as well. However, they have not been identified in the Sakarya Zone, northern Turkey to date. Here, we present, for the first time, zircon U-Pb geochronology, zircon Hf-isotopes and trace elements as well as whole-rock geochemistry and Nd-isotopes from the Karamese metagranitoid in the Yusufeli (Artvin) area, NE Turkey. The zircon U-Pb age data demonstrate that the Karamese metagranitoid intruded into the Precambrian basement units in the Early Cambrian (ca. 534-530 Ma). Zircon overgrowths in the Karamese metagranitoid interpreted as a result of metamorphic overprint yielded ages of 328 Ma. This age indicates that the Sakarya Zone experienced the Variscan metamorphic events at 328 Ma. The Early Cambrian metagranitoid shows that some rocks in the basement of the Sakarya Zone date back to Precambrian in age. The Karamese metagranitoid is an S-type granite, with high modal content of muscovite (similar to 10%). The samples show highly peraluminous [A/CNK = molar Al2O3/(CaO + K2O + Na2O) = 1.34-1.58] and medium-K calc-alkaline geochemical affinities. The Karamese metagranitoid displays low REE concentrations and a slight positive Eu anomaly and show slightly light REEs and LILEs enrichments, and HFSEs depletions. The samples have negative epsilon(Nd)(t) of -4.76 to -2.90 and epsilon(Hf) (t) of -4.75 to -1.08 values. These geochemical-isotopic characteristics reveal that the Karamase metagranitoid originated through fluid-absent muscovite dehydration melting of heterogeneous metasedimentary source rocks (mostly greywacke), with a minor input of juvenile mafic melt. We argue that the Early Paleozoic metagranitoids along the eastern Sakarya Zone is an expression of crustal thinning in the Cadomian orogenic belt in northern Gondwana, with the tectonic turnover from convergent margin to crustal extension possibly induced by break-off of Tornquist oceanic lithosphere which is a branch of Iapetus Ocean during Early Cambrian.
dc.description.sponsorshipPortuguese Foundation for Science and Technology (FCT); Recep Tayyip Erdogan University [FBA-2020-1109]; University of Aveiro [UIDB/04035/2020]
dc.description.sponsorshipThis contribution was partly funded by the Recep Tayyip Erdogan University, with a research project (grant# FBA-2020-1109) and the Portuguese Foundation for Science and Technology (FCT) for the bulk-rock Sr and Nd isotopic analyses that were implemented at the University of Aveiro, in the scope of the research project Geobiotec (UIDB/04035/2020) . We appreciate the efforts of Emrah Yildiz and Mehdi I?lhan during the zircon separation and preparation of essential thin sections. We would like to express our sincere appreciation to Prof. Dr. Aral I. Okay and an anonymous reviewer and editor-in-chief Prof. Dr. Nadia Malaspina for providing timely and comprehensive reviews that ensured the efficient handling of the manuscripts. Finally, we are indebted to Yilmaz Demir for his tireless exertion in assisting us from the beginning of this contribution to its successful end.
dc.identifier.doi10.1016/j.lithos.2022.106809
dc.identifier.issn0024-4937
dc.identifier.issn1872-6143
dc.identifier.scopus2-s2.0-85135393439
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.lithos.2022.106809
dc.identifier.urihttps://hdl.handle.net/20.500.12428/25454
dc.identifier.volume428
dc.identifier.wosWOS:000841220600001
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.subjectTornquist Ocean
dc.subjectEarly Cambrian
dc.subjectMetagreywacke
dc.subjectS-type granite
dc.subjectSakarya Zone
dc.subjectYusufeli area
dc.subjectNE Turkey
dc.titleEarly Cambrian S-type granites in the Sakarya Zone, NE Turkey: A record for transition from subduction to post-collisional extension deduced from U-Pb zircon age and Nd-Hf isotopes
dc.typeArticle

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