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Constraining the Timing of Lithospheric Thinning During Continental Collision: a Perspective of Cenozoic Basaltic Rocks From the Baltacik-Gunkoru (patnos-Malazgirt) Region in the East Anatolia, Turkey

dc.authorscopusid 36476589400
dc.authorwosid Oyan, Vural/E-4543-2019
dc.contributor.author Oyan, Vural
dc.date.accessioned 2025-05-10T17:23:27Z
dc.date.available 2025-05-10T17:23:27Z
dc.date.issued 2024
dc.department T.C. Van Yüzüncü Yıl Üniversitesi en_US
dc.department-temp [Oyan, Vural] Van Yuzuncu Yil Univ, Dept Min Engn, Zeve Campus, TR-65080 Van, Turkiye en_US
dc.description.abstract Geochemical and isotopic markers of the most primitive basaltic melts allow us to understand the temporal evolution of the lithospheric mantle and geodynamic processes. This paper presents the geochemical, Sr-Nd-PbHf isotopic data, K-Ar dating and the petrological evolution of the petrogenesis of the late Miocene-early Pliocene basaltic volcanism observed in the Baltacik-Gunkoru region in the northeastern of Lake Van in Eastern Anatolia Collision Zone (EACZ). These data allow us to understand the origin of collision-related magmatism and the geodynamic processes in the late Miocene-early Pliocene in the EACZ. Geochronological age data (K-Ar) indicate that basaltic volcanism erupted between -7.63 and 5.24 Ma. Major-incompatible trace element contents, Sr-Nd isotopic compositions of the studied samples and EC-AFC (energy-constrained recharge, assimilation, and fractional crystallization), and MELTS model calculations point out that basaltic volcanism has undergone fractional crystallization but unaffected crustal contamination. Petrological models created using Sr-87/Sr-86, epsilon Nd and epsilon Hf isotopic data, together with calculated primary melt compositions of basaltic lavas, indicate that the DMM-type (Depleted Morb Mantle) mantle source is metasomatized by melts rather than fluids derived from subducted oceanic lithosphere. Combined trace element and isotopic modelling results indicate that the calculated primary melts were formed by 2.5-5% melting of a metasomatised spinel-garnet lherzolitic mantle source, including amphibole and 1% residual rutile. This mantle source has been metasomatised by a 1-3% contribution of subducted slab component, with a sediment melt/AOC (altered oceanic crust) melt ratio of about 90:10. Thermobarometric calculations based on calculated primary melts compositions indicate that the lithosphere-asthenosphere boundary (LAB) is a depth of 67 +/- 4 km for 7.53-5.24 Ma. Literature data and the findings obtained from this study indicate that the late Miocene to early Pliocene basaltic volcanism in the south of the EACZ) is progressed by the delamination of the mantle lithosphere. This delamination occurred in a fragmented/patched or dripping manner rather than whole-scale delamination in the 3-4 million years between similar to 9 Ma and 5-6 Ma. en_US
dc.description.sponsorship Van Yuzuencue Yil University Scientific Research Project Foundation [FBA-2023-10659] en_US
dc.description.sponsorship This work has been funded by Van Yuzuencue Yil University Scientific Research Project Foundation (Project No. FBA-2023-10659) . We thank Iain Neill and the anonymous reviewer for thorough and insightful re- views and Editor Di-Cheng Zhu for his editorial support and constructive critiques. en_US
dc.description.woscitationindex Science Citation Index Expanded
dc.identifier.doi 10.1016/j.lithos.2024.107532
dc.identifier.issn 0024-4937
dc.identifier.issn 1872-6143
dc.identifier.scopus 2-s2.0-85184742515
dc.identifier.scopusquality Q1
dc.identifier.uri https://doi.org/10.1016/j.lithos.2024.107532
dc.identifier.uri https://hdl.handle.net/20.500.14720/10897
dc.identifier.volume 470-471 en_US
dc.identifier.wos WOS:001185546200001
dc.identifier.wosquality Q1
dc.institutionauthor Oyan, Vural
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.publicationcategory Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı en_US
dc.rights info:eu-repo/semantics/closedAccess en_US
dc.subject Geochemistry en_US
dc.subject Petrogenesis en_US
dc.subject Basalts en_US
dc.subject Fragmented/Dripping Delamination en_US
dc.subject Eastern Anatolia Collision Zone en_US
dc.title Constraining the Timing of Lithospheric Thinning During Continental Collision: a Perspective of Cenozoic Basaltic Rocks From the Baltacik-Gunkoru (patnos-Malazgirt) Region in the East Anatolia, Turkey en_US
dc.type Article en_US

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