| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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King, Penelope
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2019 An experimental study of SO 2 reactions with silicate glasses and supercooled melts in the system anorthite–diopside–albite at high temperature citations
- 2018SO2 gas reactions with silicate glassescitations
- 2015Porphyry copper deposit formation by sub-volcanic sulphur dioxide flux and chemisorptioncitations
- 2013Development of a new laboratory technique for high-temperature thermal emission spectroscopy of silicate meltscitations
- 2013A micro-reflectance IR spectroscopy method for analyzing volatile species in basaltic, andesitic, phonolitic, and rhyolitic glassescitations
- 2013Volatile-rich silicate melts from Oldoinyo Lengai volcano (Tanzania)citations
- 2011Methods to analyze metastable and microparticulate hydrated and hydrous iron sulfate mineralscitations
- 2009Effect of SiO2, total FeO, Fe3+/Fe2+ and alkali elements in basaltic glasses on mid-infrared spectracitations
- 2007Resolution of bridging oxygen signals from O 1s spectra of silicate glasses using XPScitations
- 2006A new approach to determine and quantify structural units in silicate glasses using micro-reflectance Fourier-Transform infrared spectroscopycitations
- 2002CO2 solubility and speciation in intermediate (andesitic) meltscitations
Places of action
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article
A micro-reflectance IR spectroscopy method for analyzing volatile species in basaltic, andesitic, phonolitic, and rhyolitic glasses
Abstract
<p>Volatile contents of geologic glasses are used to model magma chamber and degassing processes, thus, there is considerable interest in small-scale analytical techniques for analyzing volatiles in glasses. Infrared (IR) spectroscopy has the advantage of determining volatile speciation in glasses (e.g., OH-, molecular H<sub>2</sub>O, molecular CO<sub>2</sub>, and CO <sub>3</sub><sup>2-</sup>). However, sample preparation for the most common IR method used, micro-transmission IR spectroscopy, is complicated because glasses must be prepared as thin, parallel-sided wafers. Raman analysis, while valuable for Fe-poor samples, can be difficult to use for Fe-rich glasses. We have calibrated a micro-reflectance infrared method for determining volatile species using calculated Kramers-Kronig absorbance (KK-Abs.) spectra that requires that only one side of a glass be polished. The method is easier to use than other reflectance methods where it is difficult to determine the baseline for the IR bands. Total H<sub>2</sub>O wt% = m·(3600 cm<sup>-1</sup> KK-Abs.), where m, is the slope of the calibration line that is obtained from a fit to the data. The m value is related to the calculated refractive index, n, for a range of aluminosilicate glass compositions allowing the technique to be applied to samples with unknown calibration slopes. For calc-alkaline andesite glasses we determined calibration slopes for micro-reflectance IR measurements of molecular H<sub>2</sub>O, molecular CO<sub>2</sub>, and CO<sub>3</sub><sup>2-</sup>. The method has been calibrated for glasses with up to 6.76 wt% total H<sub>2</sub>O (but is useful for glasses with more than 20 wt% total H<sub>2</sub>O) and has been calibrated for glasses with up to 0.575 wt% total CO<sub>2</sub>. This technique provides a means to analyze volatile abundances in samples that are not possible to analyze or prepare for analysis with transmission micro-IR techniques. We have determined volatile contents in fragile samples such as cracked, vesicular, or crystal-bearing glasses formed by volcanic or impact processes or in high-pressure bubble nucleation experiments and H diffusion experiments. We have monitored H uptake during weathering of basaltic glasses that cannot be polished and determined volatiles in melt inclusions and pumice.</p>