Petrology and 40Ar-39Ar age of the bimodal Orduzu volcanics (Malatya) from the western end of the eastern Anatolian Neogene Volcanism, Turkey

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dc.contributor.authorÖnal, Ayten
dc.contributor.authorBoztu?, Durmuş
dc.contributor.authorArslan, Mehmet
dc.contributor.authorSpell, Terry L.
dc.contributor.authorKürüm, Sevcan
dc.date.accessioned2024-10-26T17:54:34Z
dc.date.available2024-10-26T17:54:34Z
dc.date.issued2008
dc.departmentSivas Cumhuriyet Üniversitesi
dc.description.abstractThe Orduzu volcanics, which are part of the Yamada? volcanics in the Malatya region, include rhyolite, rhyolitic dykes, trachyandesite and basaltic trachyandesitic dykes. Mafic globular occurrences within the basaltic trachyandesitic dykes, the existence of basaltic trachyandesite enclaves within the trachyandesite, and other textural and geochemical evidence all indicate magma mingling/mixing. Incremental 40Ar-39Ar dating on plagioclase from the rhyolite, from rhyolite dykes and basaltic trachyandesite yielded consistently 16 Ma (Middle Miocene). Primordial mantle-normalized spider diagrams of the rhyolite and rhyolitic dykes represent enrichments in some large ion lithophile elements (Cs, Rb, Ba, K, Th, U) but remarkably depletion in Sr, Nb, Ti, Eu and slight depletion in some high field strength elements (Hf, Zr) relative to the trachyandesites and basaltic trachyandesitic dykes. Chondrite-normalized rare earth element spider grams yield a high (La/Lu)CN (18-47) and Eu/Eu* (0.57-0.92) ratios for the rhyolites and rhyloitic dykes, but a low (La/Lu)CN (7-13) and Eu/Eu* (0.86-1.05) values for the trachyandesites and basaltic trachyandesitic dykes. From the field relations and geochemical data, it is concluded that three distinct magma sources were spatially and temporally involved in the genesis of the Orduzu volcanics, that include a calc-alkaline, crustal-derived rhyolitic melt, another calc-alkaline, lithospheric mantle-derived andesitic magma, and a mildly alkaline, lithospheric mantle-derived basaltic magma. Copyright © TÜBITAK.
dc.identifier.endpage109
dc.identifier.issn1303-619X
dc.identifier.issue1
dc.identifier.scopus2-s2.0-41949124511
dc.identifier.scopusqualityQ2
dc.identifier.startpage85
dc.identifier.urihttps://hdl.handle.net/20.500.12418/27279
dc.identifier.volume17
dc.indekslendigikaynakScopus
dc.language.isoen
dc.relation.ispartofTurkish Journal of Earth Sciences
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectAr-Ar dating; Eastern Anatolia; Malatya; Neogene volcanism; Petrology; Turkey
dc.titlePetrology and 40Ar-39Ar age of the bimodal Orduzu volcanics (Malatya) from the western end of the eastern Anatolian Neogene Volcanism, Turkey
dc.typeArticle

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