Quaternary bimodal volcanism in the Nigde Volcanic Complex (Cappadocia, central Anatolia, Turkey): age, petrogenesis and geodynamic implications

Basit Öğe Kaydı
dc.authorid0000-0002-8563-9561
dc.authorid0000-0002-9029-4211
dc.contributor.authorAydin, Faruk
dc.contributor.authorSchmitt, Axel K.
dc.contributor.authorSiebel, Wolfgang
dc.contributor.authorSonmez, Mustafa
dc.contributor.authorErsoy, Yalcin
dc.contributor.authorLermi, Abdurrahman
dc.contributor.authorDuncan, Robert
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2014
dc.departmentNiğde ÖHÜ
dc.description.abstractThe late Neogene to Quaternary Cappadocian Volcanic Province (CVP) in central Anatolia is one of the most impressive volcanic fields of Turkey because of its extent and spectacular erosionally sculptured landscape. The late Neogene evolution of the CVP started with the eruption of extensive andesitic-dacitic lavas and ignimbrites with minor basaltic lavas. This stage was followed by Quaternary bimodal volcanism. Here, we present geochemical, isotopic (Sr-Nd-Pb and delta O-18 isotopes) and geochronological (U-Pb zircon and Ar-Ar amphibole and whole-rock ages) data for bimodal volcanic rocks of the Ni g de Volcanic Complex (NVC) in the western part of the CVP to determine mantle melting dynamics and magmatic processes within the overlying continental crust during the Quaternary. Geochronological data suggest that the bimodal volcanic activity in the study area occurred between ca. 1.1 and ca. 0.2 Ma (Pleistocene) and comprises (1) mafic lavas consisting of basalts, trachybasalts, basaltic andesites and scoria lapilli fallout deposits with mainly basaltic composition, (2) felsic lavas consisting of mostly rhyolites and pumice lapilli fall-out and surge deposits with dacitic to rhyolitic composition. The most mafic sample is basalt from a monogenetic cone, which is characterized by Sr-87/Sr-86 = 0.7038, Nd-143/Nd-144 = 0.5128, Pb-206/Pb-204 = 18.80, Pb-207/Pb-204 = 15.60 and Pb-208/Pb-204 = 38.68, suggesting a moderately depleted signature of the mantle source. Felsic volcanic rocks define a narrow range of Nd-143/Nd-144 isotope ratios (0.5126-0.5128) and are homogeneous in Pb isotope composition (Pb-206/Pb-204 = 18.84-18.87, Pb-207/Pb-204 = 15.64-15.67 and Pb-208/Pb-204 = 38.93-38.99). Sr-87/Sr-86 isotopic compositions of mafic (0.7038-0.7053) and felsic (0.7040-0.7052) samples are similar, reflecting a common mantle source. The felsic rocks have relatively low zircon delta O-18 values (5.6 +/- 0.6 %) overlapping mantle values (5.3 +/- 0.3 %), consistent with an origin by fractional crystallization from a mafic melt with very minor continental crustal contamination. The geochronological and geochemical data suggest that mafic and felsic volcanic rocks of the NVC are genetically closely related to each other. Mafic rocks show a positive trend between Sr-87/Sr-86 and Th, suggesting simultaneous assimilation and fractional crystallization, whereas the felsic rocks are characterized by a flat or slightly negative variation. High Sr-87/Sr-86 gneisses are a potential crustal contaminant of the mafic magmas, but the comparatively low and invariant Sr-87/Sr-86 in the felsic volcanics suggests that these evolved dominantly by fractional crystallization. Mantle-derived basaltic melts, which experienced low degree of crustal assimilation, are proposed to be the parent melt of the felsic volcanics. Geochronological and geochemical results combined with regional geological and geophysical data suggest that bimodal volcanism of the NVC and the CVP, in general, developed in a post-collisional extensional tectonic regime that is caused by ascending asthenosphere, which played a key role during magma genesis.
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [108Y003]; German Science Foundation [Si 718/9-1]; Instrumentation and Facilities Program, Division of Earth Sciences, National Science Foundation
dc.description.sponsorshipThis work was partly supported by the Scientific and Technological Research Council of Turkey (TUBITAK, Grant 108Y003) and the German Science Foundation (Grant Si 718/9-1). The ion microprobe facility at the University of California, Los Angeles, is partly supported by a grant from the Instrumentation and Facilities Program, Division of Earth Sciences, National Science Foundation. The authors are grateful to John Huard for help during Ar-Ar dating and the Nigde University for contributions during the sample preparation processes. The authors sincerely thank Jochen Hoefs for editorial handling and to Oliver Bachman and one anonymous referee for their valuable suggestions, which greatly improved the manuscript.
dc.identifier.doi10.1007/s00410-014-1078-3
dc.identifier.issn0010-7999
dc.identifier.issn1432-0967
dc.identifier.issue5
dc.identifier.scopus2-s2.0-84912559653
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://dx.doi.org/10.1007/s00410-014-1078-3
dc.identifier.urihttps://hdl.handle.net/11480/4106
dc.identifier.volume168
dc.identifier.wosWOS:000344628100007
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherSPRINGER
dc.relation.ispartofCONTRIBUTIONS TO MINERALOGY AND PETROLOGY
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectCentral Anatolia, Turkey
dc.subjectCappadocia
dc.subjectNigde
dc.subjectBimodal volcanism
dc.subjectFC and AFC processes
dc.subjectPost-collisional extensional setting
dc.titleQuaternary bimodal volcanism in the Nigde Volcanic Complex (Cappadocia, central Anatolia, Turkey): age, petrogenesis and geodynamic implications
dc.typeArticle

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