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dc.contributor.authorEyuboglu, Yener
dc.contributor.authorChung, Sun-Lin
dc.contributor.authorSantosh, M.
dc.contributor.authorDudas, Francis O.
dc.contributor.authorAkaryali, Enver
dc.date.accessioned2019-12-13T05:50:45Z
dc.date.available2019-12-13T05:50:45Z
dc.date.issued2011
dc.identifier.citationEYÜBOGLU YENER,SUN LIN CHUNG,MADHAVA SANTOSH,DUDAS FRANCIS O,AKARYALI ENVER (2011). Transition from shoshonitic to adakitic magmatism in the eastern Pontides NE Turkey Implications for slab window melting. GONDWANA RESEARCH, 19(2), 413-429.en_US
dc.identifier.issn1342-937X
dc.identifier.urihttps://doi.org/10.1016/j.gr.2010.07.006
dc.description.abstractThe formation of the eastern Pontides orogenic belt has been widely assigned to a northward subduction of the Neotethyan oceanic slab during the late Mesozoic-Cenozoic. Here we provide an alternate model based on new geological, geochemical and isotopic data. The magmatic activity in the far south of the belt started in the early Campanian with shoshonitic trachyandesites and associated pyroclastics. This sequence is covered by the late Campanian-early Maastrichtian reefal limestones and another stage of high-K volcanism represented by analcimized leucite-rich ultrapotassic rocks of the Maastrichtian-early Paleocene (?) ages. The shoshonitic and ultrapotassic rocks, with K2O contents ranging from 0.26 to 6.95 wt.%, display broadly similar rare earth and multi-element distribution patterns. Both rock types are enriched in LILE and LREE and depleted in HFSE (Nb,Ta and Ti), suggesting a subduction-enriched mantle source for the magma generation. Subsequently, during the late Paleocene, a stage of acidic magmatism (SiO2 of 53.25-73.61 wt.%) that shows adakitic geochemical characteristics including high Sr/Y (46-416) and La/Yb (11-51) and low Y (2.6-12.2 ppm), is documented characterized by melting of a mafic source such as the MORB crust with garnet in the residue. The adakitic magmatism began at similar to 56 Ma and migrated toward the north through time, culminating with porphyritic andesites (similar to 47 Ma) that were emplaced in the Gumushane-Bayburt line and its vicinity. North of this line, coeval magmas show typical calc-alkaline nature and continued to develop toward further north until the middle to late Eocene. Based on the spatial and temporal variations in the magmas generated in the eastern Pontides orogenic belt, we propose a new geodynamic model to explain the tectonomagmatic evolution of these rocks and correlate the adakitic magmatism to ridge subduction and slab window process within a south-dipping subduction zone. Our model is in contrast to the previous proposals which envisage partial melting or delamination of thickened lower continental crust due to the collision in the south during the Paleocene-Eocene. (C) 2010 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.en_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [108Y309]en_US
dc.description.sponsorshipWe gratefully acknowledge the research grant from The Scientific and Technological Research Council of Turkey (TUBITAK-Grant 108Y309). We would also like to thank Prof. Dr. Osman Parlak, Osman Bektas and Erdin Bozkurt for their contributions and insightful discussions. Constructive and thorough reviews by A.E. Izokh and S.A. Svetov have helped us improve the paper. We thank Editor I. Safonova for her editorial handling.en_US
dc.language.isoengen_US
dc.publisherElsevier Science Bven_US
dc.relation.ispartofGondwana Researchen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectAdakite Shoshonite Geochemistry Isotopes Slab window Tectonics Eastern Mediterrenean Tethyanen_US
dc.titleTransition from shoshonitic to adakitic magmatism in the eastern Pontides, NE Turkey: Implications for slab window meltingen_US
dc.typearticleen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.description.wospublicationidWOS:000287289400005en_US
dc.description.scopuspublicationid2-s2.0-78751705025en_US
dc.departmentGümüşhane Üniversitesien_US
dc.authoridSantosh, M. / 0000-0002-1073-8477
dc.authoridChung, Sun-Lin / 0000-0002-5362-4496
dc.identifier.volume19en_US
dc.identifier.issue2en_US
dc.identifier.startpage413en_US
dc.identifier.doi10.1016/j.gr.2010.07.006
dc.identifier.endpage429en_US
dc.authorwosidChung, Sun-Lin / F-9574-2015
dc.authorwosidEyuboglu, Yener / AAN-3805-2021
dc.authorwosidSantosh, M. / B-2563-2012
dc.authorwosidChung, Sun-Lin / F-5559-2010
dc.authorscopusid15074009800
dc.authorscopusid57192003158
dc.authorscopusid55110642200
dc.authorscopusid6603106508
dc.authorscopusid36836138700


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