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dc.contributor.authorKarsli, Orhan
dc.contributor.authorŞengün, Fırat
dc.contributor.authorSantos, José Francisco
dc.contributor.authorUysal, İbrahim
dc.contributor.authorDokuz, Abdurrahman
dc.contributor.authorKandemir, Raif
dc.date.accessioned2023-01-26T11:50:21Z
dc.date.available2023-01-26T11:50:21Z
dc.date.issued2022en_US
dc.identifier.issn1342937X
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S1342937X2100349X?via%3Dihub
dc.identifier.urihttps://hdl.handle.net/20.500.12440/5567
dc.description.abstractThe Mesozoic geodynamic evolution of the Paleotethys Ocean is critical but a poorly known piece of the geological history of the Sakarya Zone, north Turkey. Here, we describe new integrated research of zircon U-Pb geochronology, bulk-rock major-trace element and Sr–Nd isotopes as well as Hf isotope of zircons from the granitic rocks of the Demirköy and Kızıldamlar plutons located in Bilecik area along the western Sakarya Zone, northwestern Turkey. Zircon U–Pb ages obtained by LA-ICP-MS reveal that the granitic magma intruded into the basement rocks during the Late Jurassic (ca. 162–157 Ma). The granites are tholeiitic and show slightly metaluminous to peraluminous geochemical affinities. The granite samples are adakitic, having relatively high Na2O (6.35–7.58 wt%) and Sr (172–580 ppm), and low K2O (0.39–1.13 wt%) and Y (3.2–5.3 ppm), and thus have high Sr/Y (70–250). The samples exhibit enrichment of light rare earth elements (REE) and large ion lithophile elements (LILE) and depletion in heavy REE and the high field strength elements (HFSE; e.g., Nb, Ti, Ta). The samples possess low 87Sr/86Sr(t) values of 0.70313 to 0.70372, and εNd(t) of −0.66 to +9.24. Zircon grains exhibit positive εHf (t) values of 5.0 to 12.8 and depleted mantle model ages of Hf (TDM1 = 0.24 to 0.68 Ga). These geochemical features and Sr–Nd–Hf radiogenic isotope systematics reveal that the adakitic rocks were likely formed by low degree melting (<10%) of the eclogitic part of an oceanic slab and subsequent melt fractionation and crustal contamination. An ongoing subduction scenario cannot explain the formation of the investigated adakitic rocks. We suggest that the adakitic plutons were generated through slab break-off after the final closure of the Paleotethys Ocean throughout the Late Jurassic (ca. 162–157 Ma). Considering the previous data, the continental back-arc basin system, leading to the opening of Neotethys Ocean at the southern margin of the continent, has been put forward to decipher the Late Jurassic tectonic evolution of the Paleotethys Ocean and the western Sakarya Zone. © 2021 International Association for Gondwana Researchen_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.ispartofGondwana Researchen_US
dc.rightsinfo:eu-repo/semantics/restrictedAccessen_US
dc.subjectMelting of oceanic slaben_US
dc.subjectNa-rich adakitesen_US
dc.subjectNW Turkeyen_US
dc.subject;Slab break-offen_US
dc.subjectThe western Sakarya Zoneen_US
dc.titleLate Jurassic Paleotethyan oceanic slab break-off revealed by Sr-Nd-Hf isotopes of Na-rich adakitic granites from northwestern Turkeyen_US
dc.typearticleen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Başka Kurum Yazarıen_US
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Jeoloji Mühendisliği Bölümüen_US
dc.authorid0000-0002-7518-2772en_US
dc.identifier.volume103en_US
dc.identifier.startpage205en_US
dc.contributor.institutionauthorDokuz, Abdurrahman
dc.identifier.doi10.1016/j.gr.2021.11.014en_US
dc.identifier.endpage220en_US
dc.authorwosidEVO-3863-2022en_US
dc.authorscopusid13406528500en_US


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