Mineral chemistry, crystallization conditions and magma mixing-mingling at Orduzu volcano (Malatya), Eastern Anatolia, Turkey

Basit Öğe Kaydı
dc.contributor.authorOnal, A.
dc.date.accessioned2024-08-04T20:30:40Z
dc.date.available2024-08-04T20:30:40Z
dc.date.issued2008
dc.departmentİnönü Üniversitesien_US
dc.description.abstractconsists of a rhyolitic lava flow, rhyolitic dykes, a trachyandesitic lava flow and basaltic trachyandesitic dykes. Existence of mafic enclaves and globules in some of the volcanic rocks, and microtextures in phenocrysts indicate that magma mingling and mixing between andesitic and basaltic melts played an important role in the evolution of the volcanic suite. Major and trace element characteristics of the volcanic rocks are similar to those formed in convergent margin settings. In particular, incompatible trace element patterns exhibit large depletions in high field strength elements (Nb and Ta) and strong enrichments in both large ion lithofile elements (Ba, Th and U) and light rare earth elements, indicating a strong subduction signature in the source of the volcanic rocks. Furthermore, petrochemical data obtained suggest that parental magmas of rhyolite lava and dykes, and trachyandesite lava and basaltic trachyandesite dykes were derived from subduction-related enriched lithospheric mantle and metasomatized mantle (asthenosphere), respectively. A detailed mineralogical study of the volcanic suite shows that plagioclase is the principal phenocryst phase in all of the rock units from the Orduzu volcano. The plagioclase phenocrysts are accompanied by quartz in the rhyolitic lava flows and by two pyroxenes in the trachyandesitic lava flows and basaltic trachyandesitic dykes. Oxide phases in all rocks are magnetite and ilmenite. Calculated crystallization temperatures range from 650 degrees C to 800 degrees C for plagioclase, 745 degrees C-1054 degrees C for biotite, 888 degrees C-915 degrees C for pyroxene and 736 degrees C-841 degrees C for magnetite-ilmenite pairs. Calculated crystallization pressures of pyroxenes vary between 1.24-5.81 kb, and oxygen fugacity range from - 14.47 to - 12.39. The estimates of magmatic intensive parameters indicate that the initial magma forming the Orduzu volcanic unit began to crystallize in a high-level magma chamber and then was stored in a shallow reservoir where it underwent intermediate-mafic mixing. The rhyolitic lava flow and dykes evolved in relatively shallower crustal magma chambers. Copyright (C) 2007 John Wiley & Sons, Ltd.en_US
dc.identifier.doi10.1002/gj.1105
dc.identifier.endpage116en_US
dc.identifier.issn0072-1050
dc.identifier.issn1099-1034
dc.identifier.issue1en_US
dc.identifier.scopus2-s2.0-38749086843en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage95en_US
dc.identifier.urihttps://doi.org/10.1002/gj.1105
dc.identifier.urihttps://hdl.handle.net/11616/94445
dc.identifier.volume43en_US
dc.identifier.wosWOS:000252603500006en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherWileyen_US
dc.relation.ispartofGeological Journalen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectmixingen_US
dc.subjectminglingen_US
dc.subjectTurkeyen_US
dc.subjectMalatyaen_US
dc.subjectrhyoliteen_US
dc.subjecttrachyandesiteen_US
dc.subjectmineralogical disequilibriumen_US
dc.subjectmineral chemistryen_US
dc.subjectcrystallization conditionsen_US
dc.titleMineral chemistry, crystallization conditions and magma mixing-mingling at Orduzu volcano (Malatya), Eastern Anatolia, Turkeyen_US
dc.typeArticleen_US

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