Mineral Chemistry of Barium- and Titanium-,Bearing Biotites in Calc-Alkaline Volcanic Rocks From the Mezitler Area (Balıkesir-Dursunbey), Western Turkey

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dc.contributor.authorYavuz, Fuat
dc.contributor.authorGültekin, Ali Haydar
dc.contributor.authorÖrgün, Yüksel
dc.contributor.authorÇelik, Nurgül
dc.contributor.authorÇelik Karakaya, Muazzez
dc.contributor.authorŞaşmaz, Ahmet
dc.date.accessioned2020-03-26T16:39:19Z
dc.date.available2020-03-26T16:39:19Z
dc.date.issued2002
dc.departmentSelçuk Üniversitesien_US
dc.description.abstractBarium- and titanium-bearing biotites from Miocene volcanic rocks of Mezitler area, eastern Balikesir, western Turkey are studied. The chemical composition of volcanic rocks range from andesite to rhyodacite. The iron-enrichment index of micas (average I.E. = 0.40) is intermediate between annite and phlogopite. The biotite phenocrysts contain up to 1.72 wt.% BaO and 5.90 wt.% TiO2, with the average formulae (K-0.807 Na-0.131 Ca-0.036 Ba-0.027) (Mg-1.404 Fe-0.800(2+) Fe-0.131(3+) Ti-0.303 Al-0.056 Mn-0.023) (Si-2.832 Al-1.167) O-10 [(OH)(1.976) Cl-0.024]. The BaO content of electron-microprobe micas is positively correlated with the Al2O3, TiO2, and FeO contents, and with the I.E., and is negatively correlated with the SiO2, K2O, and MgO contents. Ba- and Ti-rich micas are generally found in potassic igneous rocks, in subalkaline and alkaline gabbroic rocks and in contact metamorphic rocks, whereas Ba- and Ti-bearing micas in this study occur in calc-alkaline volcanic rocks that hosted manganese-oxide and barite deposits. Most of the phenocrysts analyzed have deficiencies in their octahedral and partly interlayer sites. Deficiencies in the octahedral sites may arise from the Ti-vacancy and partly the Ti-tschermakite substitution. On the other hand, deficiencies in the interlayer-site are due to the replacement of K by Ba. The substitution mechanism in the Mezitler micas is characterized by Ba + 2Ti + 3Al = (K+Na+Ca) + 3(Mg+Fe+Mn) + 3Si, with an excellent correlation coefficient. In terms of aluminum and titanium contents, micas from the Mezitler area lie on a similar trend parallel to that for metasomatic phlogopites from Canary Island xenoliths, which overlap the field for micas from the Ilha da Trindade xenolith, South Atlantic. Biotite compositions from the Mezitler area fall between the quartz-fayalite-magnetite (QFM) and nickel-nickel oxide (NNO) oxygen fugacity buffers. All these show that Mezitler micas with low to moderate Ba- and Ti-contents may be formed from magmas in a subduction-enriched sub-continental lithospheric mantle environment.en_US
dc.identifier.citationYavuz, F., Gültekin, A. H., Örgün, Y., Çelik, N., Çelik Karakaya, M., Şaşmaz, A., (2002). Mineral Chemistry of Barium- and Titanium-,Bearing Biotites in Calc-Alkaline Volcanic Rocks From the Mezitler Area (Balıkesir-Dursunbey), Western Turkey. Geochemical Journal, 36(6), 563-580. Doi: 10.2343/geochemj.36.563
dc.identifier.doi10.2343/geochemj.36.563en_US
dc.identifier.endpage580en_US
dc.identifier.issn0016-7002en_US
dc.identifier.issn1880-5973en_US
dc.identifier.issue6en_US
dc.identifier.scopusqualityQ3en_US
dc.identifier.startpage563en_US
dc.identifier.urihttps://dx.doi.org/10.2343/geochemj.36.563
dc.identifier.urihttps://hdl.handle.net/20.500.12395/17995
dc.identifier.volume36en_US
dc.identifier.wosWOS:000179836500003en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorÇelik Karakaya, Muazzez
dc.institutionauthorŞaşmaz, Ahmet
dc.language.isoenen_US
dc.publisherGEOCHEMICAL SOC JAPANen_US
dc.relation.ispartofGeochemical Journalen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.selcuk20240510_oaigen_US
dc.titleMineral Chemistry of Barium- and Titanium-,Bearing Biotites in Calc-Alkaline Volcanic Rocks From the Mezitler Area (Balıkesir-Dursunbey), Western Turkeyen_US
dc.typeArticleen_US

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