QUANTIFICATION OF WATER CONTENT AND SPECIATION IN NATURAL SILICIC GLASSES (PHONOLITE, DACITE, RHYOLITE) BY CONFOCAL MICRORAMAN SPECTROMETRY

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dc.contributor.author Di Muro A.
dc.contributor.author Villemant B.
dc.contributor.author Montagnac G.
dc.contributor.author Scaillet B.
dc.contributor.author Reynard B.
dc.date.accessioned 2024-05-05T03:46:11Z
dc.date.available 2024-05-05T03:46:11Z
dc.date.issued 2006
dc.identifier https://elibrary.ru/item.asp?id=12091801
dc.identifier.citation Geochimica et Cosmochimica Acta, 2006, 70, 11, 2868-2884
dc.identifier.issn 0016-7037
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/43813
dc.description.abstract The determination of total water content (H2OT: 0.1-10 wt%) and water speciation (H2Omolecular/OH) in volcanic products by confocal microRaman spectrometry are discussed for alkaline (phonolite) and calcalkaline (dacite and rhyolite) silicic glasses. Shape and spectral distribution of the total water band (H2OT) at ?3550 cm-1 show systematic evolution with glass H2OT, water speciation and NBO/T. In the studied set of silicic samples, calibrations based on internal normalization of the H2OT band to a band related to vibration of aluminosilicate network (TOT) at ?490 cm-1 vary with glass peraluminosity. An external calibration procedure using well-characterized glass standards is less composition-dependent and provides excellent linear correlation between total dissolved water content and height or area of the H2OT Raman band. Accuracy of deconvolution procedure of the H2OT band to quantify water speciation in water-rich and depolymerized glasses depends on the strength of OH hydrogen bonding. System confocal performance, scattering from embedding medium and glass microcrystallinity have a crucial influence on accuracy of Raman analyses of water content in glass-bearing rocks and melt inclusions in crystals. ? 2006 Elsevier Inc. All rights reserved.
dc.subject DACITE
dc.subject PHONOLITE
dc.subject RAMAN SPECTROSCOPY
dc.subject RHYOLITE
dc.subject SPECIATION (CHEMISTRY)
dc.subject WATER CONTENT
dc.title QUANTIFICATION OF WATER CONTENT AND SPECIATION IN NATURAL SILICIC GLASSES (PHONOLITE, DACITE, RHYOLITE) BY CONFOCAL MICRORAMAN SPECTROMETRY
dc.type Статья
dc.identifier.doi 10.1016/j.gca.2006.02.016


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