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dc.contributor.authorKarsli, Orhan
dc.contributor.authorIlhan, Mehdi
dc.contributor.authorKandemir, Raif
dc.contributor.authorDokuz, Abdurrahman
dc.contributor.authorAydin, Faruk
dc.contributor.authorUysal, Ibrahim
dc.contributor.authorDuygu, Levent
dc.date.accessioned2021-11-09T19:49:59Z
dc.date.available2021-11-09T19:49:59Z
dc.date.issued2021
dc.identifier.issn0024-4937
dc.identifier.issn1872-6143
dc.identifier.urihttps://doi.org/10.1016/j.lithos.2020.105884
dc.identifier.urihttps://hdl.handle.net/20.500.12440/4171
dc.description.abstractLate Mesozoic evolution of the Neotethys Ocean is critical and still remains unclear along the entire Sakarya Zone (SZ), Turkey, because previous interpretations of the Middle to Late Jurassic rifting of the SZ have not been consensually accepted. We identified, for the first time, the Early Cretaceous dykes intruded into the Late Jurassic and Late Carboniferous bodies in the Camlkaya (Erzurum) area in the SZ. Here, we present a data set of new field observations, Ar-40/Ar-39 geochronology, whole-rock geochemical and Sr-Nd isotopes to find out the tectonic setting of previously undated basic to intermediate igneous rocks. Ar-40/Ar-39 technique on the groundmass separations yielded the plateau ages of 128.78 +/- 1.02 to 122.89 +/- 0.82 Ma. The investigated dykes are compositionally divided into two sub-groups: calc-alkaline lamprophyres (CAL) and high-Nb alkaline basalts (HNB). They show enrichment in large ion lithophile elements (LILE: e.g., Rb, Ba, K) and depletion in high field strength elements (HFSE: Nb and Ti) as well as moderate fractionation of light rare earth elements relative to heavy rare earth elements. The HNB have high Mg# (47-66), and relatively unradiogenic Sr [Sr-87/Sr-86(t) = 0.70385 to 0.70510] and Nd [epsilon(Nd)(t) = +0.5 to +5.3] isotopic composition, whereas the CAL possess moderate to high Mg# (32-72), and relatively high Sr [Sr-87/Sr-86(t) = 0.70586 to 0.71379] and Nd [epsilon(Nd)(t) = +1.5 to -9.9] isotopic composition. Early Cretaceous high-angle subduction triggered upwelling of the asthenosphere at 126 Ma, which likely generated a heat anomaly. This anomaly has probably induced melting of the oceanic slab and the metasomatized mantle to form the CAL and HNB. The HNB were generated by low degrees of melting of mantle domain that was previously reacted by oceanic slab-related adakitic melts at the depths of the garnet stability field (>= 70 km). However, the CAL were probably formed at shallower mantle levels within the garnet-amphibole field by a relatively higher degree of melting of the mantle, also modified by subducted slab sediments. A new field, age, and petrochemical data from the Early Cretaceous dykes, combined with the presence of Aptian deep-water sediments to the north and the Late Jurassic-Early Cretaceous platform carbonates deposited in the passive margin setting along the entire SZ, imply the initiation of active-margin magmatism in the SZ. We suggest that the coexistence of the Early Cretaceous CAL and HNB points to the formation of an Andean-type active margin above a north-dipping Neotethyan oceanic slab. Their emplacement ages are associated with the inception of the magmatic arc structure and refer to a significant geodynamic turnover from passive-margin to active-margin tectonics along the SZ. (c) 2020 Elsevier B.V. All rights reserved.en_US
dc.description.sponsorshipRecep Tayyip Erdogan UniversityRecep Tayyip Erdogan University [FYL-2018-944]en_US
dc.description.sponsorshipThis work was financially supported by the Recep Tayyip Erdogan University, with a Project (grant#FYL-2018-944). We appreciate Dr. Serhat Koksal from the Middle East Technical University for his effort during the Sr-Nd radiogenic isotope analyses. We wish to express our sincere appreciation to an anonymous reviewer, Robert Moritz and editor-in-chief Michael Roden for their detailed comments and constructive suggestions, which have enabled us to improve the manuscript greatly.en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.ispartofLithosen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectEarly Cretaceous active-marginen_US
dc.subjectMantle wedgeen_US
dc.subjectCalc-alkaline lamprophyreen_US
dc.subjectHigh-Nb alkaline basalten_US
dc.subjectNE Turkeyen_US
dc.titleNature of the Early Cretaceous lamprophyre and high-Nb basaltic dykes, NE Turkey: Constraints on their linkage to subduction initiation of Neotethyan oceanic lithosphereen_US
dc.typearticleen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.description.wospublicationidWOS:000612255400001en_US
dc.description.scopuspublicationid2-s2.0-85097233330en_US
dc.departmentGümüşhane Üniversitesien_US
dc.authoridUysal, Ibrahim / 0000-0001-7607-2893
dc.identifier.volume380en_US
dc.identifier.doi10.1016/j.lithos.2020.105884
dc.authorwosidAydin, Faruk / AAG-5614-2019
dc.authorwosidUysal, Ibrahim / AAE-3044-2019
dc.authorscopusid6506159221
dc.authorscopusid57220194703
dc.authorscopusid12808048100
dc.authorscopusid13406528500
dc.authorscopusid57196624878
dc.authorscopusid50062274000
dc.authorscopusid57220200210


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