Micro FT-IR study of the hydration-layer during dissolution of silica glass

Yanagisawa, Norio; Fujimoto, Koichiro; Nakashima, Satoru; Kurata, Yoshiaki; Sanada, Norio

doi:10.1016/s0016-7037(96)00406-1

Cited by 40 publications

(31 citation statements)

References 14 publications

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“…an Si-and Al-rich residue layer that could not be detected in the samples studied; and 2. palagonitization rates that are higher than water-diffusion rates in glass, as shown by glass dissolution experiments (Burn and Roberts 1970;Doremus 1983;Nogami and Tomozawa 1984;Tomozawa 1985;Zhang et al 1991;Yanagisawa et al 1997) in conjunction with palagonite rind thickness measurements and sample ages.…”

Section: The Mechanism Of Palagonitization -Influence Of Fluid Propermentioning

confidence: 94%

“…Numerous experimental studies have been performed on the glass-dissolution process (White 1983;Crovisier et al 1987;Bourcier et al 1989;Anbeek 1990;Rowe and Brantley 1993;Berger et al 1994;Eick et al 1996;Yanagisawa et al 1997;Techner et al 1998) but experimental studies on the process of palagonite precipitation and its controlling mechanism, including the evaluation of the thermodynamic properties of its formation, are rare. Most statements about the formation of palagonite and its evolution are based on analytical studies of naturally palagonitized glasses.…”

Section: The Mechanism Of Palagonitization -Influence Of Fluid Propermentioning

confidence: 99%

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Palagonite – a review

Stroncik

Schmincke²

2002

Int J Earth Sci (Geol Rundsch)

240

181

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Palagonite is the first stable product of volcanic glass alteration. It is a heterogeneous material, usually with highly variable optical and structural properties, ranging from a clear, transparent, isotropic, smooth and commonly concentrically banded material, commonly called "gel-palagonite", to a translucent, anisotropic, slightly to strongly birefringent material of fibrous, lathlike or granular structure, commonly called "fibropalagonite". The color of palagonite ranges from shades of yellow to shades of brown. Palagonite forms rinds of variable thickness on every mafic glass surface exposed for some time to aquatic fluids. It is formed by either incongruent dissolution or by congruent dissolution of glass with contemporaneous precipitation of insoluble material at the glass-fluid interface. The process of palagonitization is accompanied by extensive mobilization of all elements involved in the alteration process, resulting in the depletion or enrichment of certain elements. The extent and direction of element mobility and the palagonitization process itself (including the rate of palagonitization) depend on a number of different, complex interacting properties: e.g. (1) temperature, (2) the structure of the primary material, (3) the reactive surface area of the primary material, (4) the structure of the precipitating secondary phases, (5) the growth rates of the secondary phases, (6) time, and (7) fluid properties such as fluid flow rates, pH, Eh, ionic strength, and oxygen fugacity. The fluid properties themselves are affected by different hydrogeological properties such as porosity, permeability, and pressure gradients.

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Section: The Mechanism Of Palagonitization -Influence Of Fluid Propermentioning

confidence: 94%

Section: The Mechanism Of Palagonitization -Influence Of Fluid Propermentioning

confidence: 99%

Palagonite – a review

Stroncik

Schmincke²

2002

Int J Earth Sci (Geol Rundsch)

240

181

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“…Nevertheless, the similar results suggest that the intense water bands do not greatly affect the curve-fitting results. Previous studies used band heights for quantification (Pandya et al, 1992;Yanagisawa et al, 1997;Zhang et al, 1997). As this study shows that the band of interest may have a slightly different width from sample to sample, the use of band areas is more appropriate.…”

Section: Resultsmentioning

confidence: 93%

“…The Fourier-transform infrared (FTIR) technique has been used for both qualitative and quantitative determination in mineral species (McMillan et al, 1988;Pandya et al, 1992;Schroeder, 1992;Yanagisawa et al, 1997;Zhang et al, 1997). The method presents a number of important advantages: simple preparation, high sensitivity, and rapid analysis.…”

Section: Introductionmentioning

confidence: 99%

Quantification of Mixed-Layer Illite-Smectite in Glass Matrices by Fourier-Transform Infrared Spectroscopy

Fuente

Cuadros

Linares

2000

Clays and clay miner.

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“…The pressure can be adjusted by changing both temperature and amount of added water. Although the temperature and pressure ranges are much lower than those applied in the past hydration experiments for hydrous melt viscometry, this technique can produce glass hydration (e.g., Yanagisawa et al 1997). Except for one sample, the temperature used in this study was 500C, and the vapor pressure ranged between 0.1 and 2.1 MPa; samples were kept for 40-120 h for hydration to take place.…”

Section: Sample Preparationmentioning

confidence: 99%

Viscosity measurements of hydrous rhyolitic melts using the fiber elongation method

2005

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We have devised a new, simple and easy technique to measure the viscosity of hydrous silicate melts by combining an autoclave for melt hydration and the fiber elongation method for viscosity measurement. Using this, we measured the viscosity of hydrous rhyolitic melts whose water content ranges from 0.02 to 0.58 wt%. We observed a drastic decrease in viscosity against water content: 0.1 wt% water decreases the viscosity about an order of magnitude. Even when the water content is only 0.02 wt%, the viscosity decreased about half an order of magnitude. These results clearly demonstrate that the effect of water on viscosity should not be ignored even when it occurs as a trace constituent. We compared our experimental data with those derived from a non-Arrhenian viscosity model, which is considered to be applicable to calc-alkaline samples. This model succeeded in expressing the viscosity variation against water content but was unable to accurately predict the measured viscosity of liquids.

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Micro FT-IR study of the hydration-layer during dissolution of silica glass

Cited by 40 publications

References 14 publications

Palagonite – a review

Palagonite – a review

Quantification of Mixed-Layer Illite-Smectite in Glass Matrices by Fourier-Transform Infrared Spectroscopy

Viscosity measurements of hydrous rhyolitic melts using the fiber elongation method

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