Elemental and Sr-Nd-Pb isotopic geochemistry of the most recent Quaternary volcanism in the Erzincan Basin, Eastern Turkey: framework for the evaluation of basalt-lower crust interaction

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dc.authorid0000-0002-8091-1239
dc.contributor.authorKarsli, Orhan
dc.contributor.authorChen, Bin
dc.contributor.authorUysal, Ibrahim
dc.contributor.authorAydin, Faruk
dc.contributor.authorWijbrans, Jan R.
dc.contributor.authorKandemir, Raif
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2008
dc.departmentNiğde ÖHÜ
dc.description.abstractWhole-rock geochemical and Sr, Nd and Pb isotope data are presented for a representative suite of the Quaternary Erzincan Volcanics (QEV) from the Erzincan basin (EB) along the North Anatolian Fault Zone, aiming to understand their origin and implications for basalt-lower crust interaction. Unspiked K-Ar and (40)Ar/(39)Ar dating of dome lavas from the QEVs yielded ages of 102 +/- 2 to 1061 +/- 88 ka. The QEVs range from high-K low silica trachy-andesite to rhyolite in composition, with rhyolite volumetrically the most abundant. All rocks show high-K calc-alkaline affinity, a geochemical signature common to many post-collisional magmas. They are characterized by enrichment in LILE (Rb, Ba, K, Th) and LREE ((La/Yb)(CN) = 3-33), with pronounced depletion of HFSE. All lavas show negligible or small negative Eu anomalies in the andesitic to dacitic and strong Eu anomalies in the rhyolitic samples. These rocks have relatively low (87)Sr/(86)Sr = 0.70404-0.70587 and slightly depleted Nd isotopic compositions (epsilon(Nd) from -0.9 to 2.8), with significantly varied Mg# ranging from 2 to 53. Pb isotopic compositions [(206)Pb/(204)Pb = 18.90-19.02, (207)Pb/(204)Pb = 15.64-15.70, (208)Pb/(204)Pb = 38.91-39.97] reveal an enriched source signature, which implies that some portions of metasomatized lithospheric mantle could have contributed to their genesis. The isotopic ratios and chemical features along with the textural and compositional disequilibrium of the plagioclases and amphiboles suggest that mixing of mafic and felsic magmas played an important role in the magma genesis. A possible scenario for the genesis of these volcanic rocks is that basaltic magma formed as a result of partial melting of a subcontinental lithospheric mantle source responding to a possible upwelling of asthenospheric mantle which was caused by the extension produced by strike-slip tectonics. Underplating of these high-temperature basaltic magmas sparked partial fusion of a juvenile lower continental crust producing felsic melts; then magma mixing between basaltic and the felsic magmas followed. Fractional crystallization, with minor amounts crustal contamination could have played an important role in the evolution of magma. Modelling based on Sr and Nd isotope data shows that less than 10% of a basic magma and about 90% of juvenile lower continental crustal material was involved in the generation of the QEVs in a pull-apart basin along the North Anatolian Fault Zone. (C) 2008 Elsevier B.V. All rights reserved.
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK); [104Y041]
dc.description.sponsorshipThe financial background of this work was ensured by the Scientific and Technological Research Council of Turkey (TUBITAK) with grant # 104Y041. We would like to thank Rainer Altherr for providing microprobe analyses for this study in the Mineralogical Institute of Heidelberg University. Special thanks are due to M. Cemal Goncuoglu, H. oban and C. Deniel for constructive comments on an early version of this manuscript. Recommendations about the geodynamic evolution of the region from Abdurrahman Dokuz are gratefully acknowledged. Reviews provided by G. Pe-Piper and C. R. Bacon helped improve the quality of paper. Editorial comments by N. Eby are also acknowledged.
dc.identifier.doi10.1016/j.lithos.2008.06.008
dc.identifier.endpage70
dc.identifier.issn0024-4937
dc.identifier.issue45323
dc.identifier.scopus2-s2.0-54349109771
dc.identifier.scopusqualityQ1
dc.identifier.startpage55
dc.identifier.urihttps://dx.doi.org/10.1016/j.lithos.2008.06.008
dc.identifier.urihttps://hdl.handle.net/11480/5190
dc.identifier.volume106
dc.identifier.wosWOS:000261217200005
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherELSEVIER SCIENCE BV
dc.relation.ispartofLITHOS
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectSr-Nd-Pb isotopes
dc.subjectRhyolites
dc.subjectBasalt-crust interactions
dc.subjectRhyolite domes
dc.subjectQuaternary Erzincan Volcanics
dc.subjectNorth Anatolian Fault Zone
dc.subjectEastern Turkey
dc.titleElemental and Sr-Nd-Pb isotopic geochemistry of the most recent Quaternary volcanism in the Erzincan Basin, Eastern Turkey: framework for the evaluation of basalt-lower crust interaction
dc.typeArticle

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