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dc.contributor.authorArslan, Mehmet
dc.contributor.authorTemizel, Irfan
dc.contributor.authorAbdioglu, Emel
dc.contributor.authorKolayli, Hasan
dc.contributor.authorYucel, Cem
dc.contributor.authorBoztug, Durmus
dc.contributor.authorSen, Cuneyt
dc.descriptionWOS: 000320655900007en_US
dc.description.abstractThe Eocene volcano-sedimentary units in the southern part of the Eastern Pontides (NE Turkey) are confined within a narrow zone of east-west trending, semi-isolated basins in Bayburt, GumuAYhane, Airan and Alucra areas. The volcanic rocks in these areas are mainly basalt and andesite through dacite, with a dominant calc-alkaline to rare tholeiitic tendency. Ar-40-Ar-39 dating of these volcanic rocks places them between 37.7 +/- A 0.2 and 44.5 +/- A 0.2 Ma (Middle Eocene). Differences in the major and trace element variations can be explained by the fractionation of clinopyroxene +/- A magnetite in basaltic rocks and that of hornblende + plagioclase +/- A magnetite +/- A apatite in andesitic rocks. Primitive mantle-normalized multi-element variations exhibit enrichment of large-ion lithophile elements and to a lesser extent, of light rare earth elements, as well as depletion of high field strength elements, thus revealing that volcanic rocks evolved from a parental magma derived from an enriched mantle source. Chondrite-normalized rare earth element patterns of the aforementioned volcanic rocks resemble each other and are spoon-shaped with low-to-medium enrichment (La-N/Lu-N = 2-14), indicating similar spinel lherzolitic mantle source(s). Sr, Nd and Pb isotopic systematics imply that the volcanic rocks are derived from a subduction-modified subcontinental lithospheric mantle. Furthermore, post-collisional thickened continental crust, lithospheric delamination and a subduction-imposed thermal structure are very important in generating Tertiary magma(s). The predominantly calc-alkaline nature of Eocene volcanic rocks is associated with increasing geodynamic regime-extension, whereas tholeiitic volcanism results from local variations in the stress regime of the ongoing extension and the thermal structure, as well as the thickness of the crust and the mantle-crust source regions. Based on volcanic variety and distribution, as well as on petrological data, Tertiary magmatic activity in Eastern Pontides is closely related to post-collisional thinning of the young lithosphere, which, in turn, is caused by extension and lithospheric delamination after collisional events between the Tauride-Anatolide Platform and the Eurasian Plate.en_US
dc.description.sponsorshipTurkish Scientific Research Council (TUBITAK-CAYDAG) [103Y012]; Karadeniz Technical University (BAP) [2008.112.005.6]en_US
dc.description.sponsorshipThis study was funded by the Turkish Scientific Research Council (TUBITAK-CAYDAG project no: 103Y012) and in part by the Karadeniz Technical University (BAP Project no: 2008.112.005.6). We would like to thank Lang Shi from the Department of Earth and Planetary Sciences, McGill University (Canada) for performing the microprobe analyses, Yehudit Harlavan from the Geological Survey of Israel for the Sr and Pb isotope analyses, and Gilles Ruffet from the Geosciences Rennes1 (Rennes, Cedex, France) for the Ar-Ar dating and Nd isotope analyses. We are also grateful to our editor, Gordon Moore, Yildirim Dilek and all the anonymous reviewers for their constructive and insightful comments to improve our paper. We also thank Rona McGill from the Scottish Universities Environmental Research Centre (Scotland, United Kingdom) for the English editing.en_US
dc.subjectPost-collisional volcanicsen_US
dc.subjectIsotope geochemistryen_US
dc.subjectGeodynamic evolutionen_US
dc.titleAr-40-Ar-39 dating, whole-rock and Sr-Nd-Pb isotope geochemistry of post-collisional Eocene volcanic rocks in the southern part of the Eastern Pontides (NE Turkey): implications for magma evolution in extension-induced originen_US
dc.contributor.department[Arslan, Mehmet -- Temizel, Irfan -- Abdioglu, Emel -- Kolayli, Hasan -- Yucel, Cem -- Sen, Cuneyt] Karadeniz Tech Univ, Dept Geol Engn, Fac Engn, TR-61080 Trabzon, Turkey -- [Boztug, Durmus] Cumhuriyet Univ, Fac Engn, Dept Geol Engn, TR-58140 Sivas, Turkeyen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US

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