Late Jurassic Paleotethyan oceanic slab break-off revealed by Sr-Nd-Hf isotopes of Na-rich adakitic granites from northwestern Turkey

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dc.authorid0000-0002-7323-9659en_US
dc.authorscopusid15726508400en_US
dc.authorwosidI-7585-2017en_US
dc.contributor.authorKarslı, Orhan
dc.contributor.authorŞengün, Fırat
dc.contributor.authorSantos, José Francisco
dc.contributor.authorUysal, İbrahim
dc.contributor.authorDokuz, Abdurrahman
dc.contributor.authorAydın, Faruk
dc.contributor.authorKandemir, Raif
dc.date.accessioned2023-05-23T07:01:26Z
dc.date.available2023-05-23T07:01:26Z
dc.date.issued2022en_US
dc.departmentMeslek Yüksekokulları, Çan Meslek Yüksekokulu, Madencilik ve Maden Çıkarma Bölümü
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 eNd(t) of 0.66 to +9.24. Zircon grains exhibit positive eHf (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 con- tamination. 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.en_US
dc.identifier.citationKarslı, O., Şengün, F., Santos, J. F., Uysal, İ., Dokuz, A., Aydin, F., & Kandemir, R. (2022). Late jurassic paleotethyan oceanic slab break-off revealed by sr-nd-hf isotopes of na-rich adakitic granites from northwestern turkey. Gondwana Research, 103, 205-220. doi:10.1016/j.gr.2021.11.014en_US
dc.identifier.doi10.1016/j.gr.2021.11.014
dc.identifier.endpage220en_US
dc.identifier.issn1342-937X
dc.identifier.issn1878-0571
dc.identifier.scopus2-s2.0-85122428566
dc.identifier.startpage205en_US
dc.identifier.urihttps://doi.org/10.1016/j.gr.2021.11.014
dc.identifier.urihttps://hdl.handle.net/20.500.12428/4187
dc.identifier.volume103en_US
dc.identifier.wosWOS:000753605900003
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorŞengün, Fırat
dc.language.isoen
dc.publisherElsevier Inc.en_US
dc.relation.ispartofGondwana Researchen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectMelting of oceanic slaben_US
dc.subjectNa-rich adakitesen_US
dc.subjectNW Turkeyen_US
dc.subjectSlab 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 Turkey
dc.typeArticle

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