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Spectroscopic characterization of manganese occurrences along crack surfaces of the rhyolitic ignimbrite (Inner west anatolia-Turkey)

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dc.contributor.author Koralay, Tamer
dc.contributor.author Kadioğlu, Y.K.
dc.contributor.author Deniz, K.
dc.date.accessioned 2019-08-16T13:34:05Z
dc.date.available 2019-08-16T13:34:05Z
dc.date.issued 2018
dc.identifier.issn 13142704 (ISSN); 9786197408355 (ISBN); 9786197408362 (ISBN); 9786197408379 (ISBN); 9786197408386 (ISBN); 9786197408393 (ISBN); 9786197408409 (ISBN); 9786197408416 (ISBN); 9786197408423 (ISBN); 9786197408430 (ISBN); 9786197408447 (ISBN); 9786197408454 (ISBN); 9786197408461 (ISBN); 9786197408478 (ISBN); 9786197408485 (ISBN); 9786197408492 (ISBN); 9786197408508 (ISBN); 9786197408515 (ISBN); 9786197408522 (ISBN); 9786197408355 (ISBN)
dc.identifier.uri http://acikerisim.pau.edu.tr:8080/xmlui/handle/11499/10955
dc.description.abstract Manganese occurrences (eg. dendrite and/or surface coating) are highly usual products of many geologic environments. Morphology, spectroscopic and chemical properties of the manganese occurrences may vary depending on mode of environments. This study is concern with manganese occurrences along the minor cracks of Miocene ignimbrite unit, which has a wide range of exposure in the Afyonkarahisar region of the inner western part of Anatolia. The host rock has light gray, yellowish white in color and characterized by a matrix-supported structure. It is poorly sorted, with lithic and pumice clasts of varying size scattered in the ash matrix. The host rock has assemblage of quartz + sanidine + plagioclase + biotite and Fe-Ti oxide (magnetite, ilmenite) mineral composition showing hypohyaline porphryric and rarely trachytic, spherulitic textures under the microscope. The chemical composition of host rock is characterized by high SiO2 (wt. % 72.14-77.69), K2O (wt. % 4.48-6.10) with remarkably low MgO (wt. % 0.02-0.31), Fe2O3 (wt. % 0.74-4.30), CaO (wt. % 0.84-1.17) and MnO (wt. % 0.03-0.08) contents. It has calc-alkaline in character and A/CNK ratios are between 1.29-1.50. Bright to pale black and blackish gray colored manganese formations have been found as dendritic and/or radial shaped surface coatings within the cracks in rhyolitic ignimbrite lithology. According to the intensity values, manganese samples have six chief Raman groups of bands centered at 618-638, 574-583, 505-512, 363-373, 269-292 and 181-182 cm-1. The most intense peaks are observed in the 574-583 and 181-182 cm-(Cryptomelane1 region. Manganese-K(Mnoccurrences4+,Mn2+)8O16)are essentiallyphases in potassium-bearingEPMA results. Thesemanganeseresultsoxideare supported by CRS (Confocal Raman Spectroscopy) and XRD (X-Ray Diffractometer) studies. Manganese dendrites and coatings have limited major elements compositional ranges that vary from MnO (wt. % 62.75-67.57), SiO2 (wt. % 4.53-14.92), CaO (wt. % 0.28-0.46) and Fe2O3 (as total iron) (wt. % 0.0004-0.284). The Continental Crust (CC) normalized elemental pattern of manganese samples reveal enrichment in Ba, U, Ta, Nb, Y and Pb elements and depletion in Ti and Zr elements. All spectroscopic and geochemical data indicate that relatively low temperatures vapor-phase solutions originated from the late stage of felsic magma may have played play an important role during the formation of manganese dendrites and coatings. © SGEM2018.
dc.language.iso English
dc.publisher International Multidisciplinary Scientific Geoconference
dc.relation.isversionof 10.5593/sgem2018/1.1/S01.061
dc.rights info:eu-repo/semantics/closedAccess
dc.subject Afyonkarahisar
dc.subject Cryptomelane
dc.subject Rhyolitic Ignimbrite
dc.subject Vapor Phase Crystallization
dc.subject Alkalinity
dc.subject Binary alloys
dc.subject Black coatings
dc.subject Feldspar
dc.subject Hematite
dc.subject Lithology
dc.subject Magnesia
dc.subject Magnetite
dc.subject Manganese oxide
dc.subject Mica
dc.subject Potassium compounds
dc.subject Silica
dc.subject Titanium alloys
dc.subject Titanium oxides
dc.subject Chemical compositions
dc.subject Confocal Raman spectroscopy
dc.subject Ignimbrites
dc.subject Spectroscopic characterization
dc.subject Vapor Phase
dc.subject X ray diffractometers
dc.subject Manganese
dc.title Spectroscopic characterization of manganese occurrences along crack surfaces of the rhyolitic ignimbrite (Inner west anatolia-Turkey)
dc.type Conference Paper
dc.identifier.volume 18
dc.identifier.issue 1.1
dc.identifier.startpage 481
dc.identifier.endpage 488
dc.identifier.index Scopus

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