Water and magmas; a mixing model

Burnham, Charles W.

doi:10.1016/0016-7037(75)90050-2

Cited by 346 publications

(131 citation statements)

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“…Water dissolves in melts as both hydroxyl groups and molecular water reacting with the silicate network in different ways (Stolper, 1982a,b;Stolper, 1985, 1989;Silver et al 1990). According to the classical model of water dissolution (Burnham, 1975;Stolper, 1982a,b;Kubicki, 1993, 1994;McMillan, 1994), water dissolves into polymerized compositions such as AMS-B1 and PS melts by creating NBOs in terms of SiOH and AlOH species and disrupting the silicate network. The depolymerization reaction not only decreases the overall T-O strength of the melt (increasing in topological contribution to Cpconf and Sc) but also creates a large number of configurational states available for the activation of viscous flow (increasing the chemical contribution to Cpconf and Sc).…”

Section: Configurational Heat Capacity Of Hydrous Magmasmentioning

confidence: 99%

Heat capacity, configurational heat capacity and fragility of hydrous magmas

Genova

Romano

Giordano

et al. 2014

Geochimica et Cosmochimica Acta

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International audienceThe glassy and liquid heat capacities of four series of dry and hydrous natural glasses and magma as a function of temperature and water content (up to 19.9 mol%) were investigated using differential scanning calorimetry (DSC). The analyzed compositions are basalt, latite, trachyte and pantellerite. The results of this study indicate that the measured heat capacity of glasses (Cpg) is a linear function of composition and is well reproduced by the empirical model of Richet (1987). For the investigated glasses, the partial molar heat capacity of water can be considered as independent of composition, in agreement with Bouhifd et al. (2006). For hydrous liquids, the heat capacity (Cpliq) decreases nonlinearly with increasing water content. Previously published models, combined with the partial molar heat capacity of water from the literature, are not able to reproduce our experimental data in a satisfactory way. We estimated the partial molar heat capacity of water (CpH2O) in hydrous magma over a broad compositional range. The proposed value is 41 ± 3 J mol-1 K-1. Water strongly affects the configurational heat capacity at the glass transition temperature [Cpconf (Tg)]. An increases of Cpconf (Tg) with water content was measured for the polymerized liquids (trachyte and pantellerite), while the opposite behavior was observed for the most depolymerized liquids (basalt and latite). Structural and rheological implications of this behavior are discussed in light of the presented results

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Section: Configurational Heat Capacity Of Hydrous Magmasmentioning

confidence: 99%

Heat capacity, configurational heat capacity and fragility of hydrous magmas

Genova

Romano

Giordano

et al. 2014

Geochimica et Cosmochimica Acta

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“…In simplified systems additional constraints are also provided by calorimetric measurements such as those performed to determine the entropy of melting (Bottinga, 1985;Navrotsky et al, 1989;Richet et al, 1993;Tangeman et al, 2001). One advantage of examining experiments in simple systems is that treatment with relatively simple thermodynamic models should provide a firmer basis for understanding hydrous melting on a physicochemical level (Burnham, 1975;Silver and Stolper, 1985) and can be used to examine how the effect of H 2 O on melting may be further modified by pressure.…”

Section: Introductionmentioning

confidence: 99%

Melting phase relations in the systems Mg2SiO4–H2O and MgSiO3–H2O and the formation of hydrous melts in the upper mantle

Novella

Dolejš

Myhill

et al. 2017

Geochimica et Cosmochimica Acta

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms A temperature dependent equilibrium constant is necessary to reproduce the data, however, implying that molecular H 2 O becomes more important in the melt with decreasing temperature. The data for hydrous forsterite melting at 13 GPa are inconclusive due to uncertainties in the anhydrous melting temperature at these conditions. When applied to results on natural peridotite melt systems at similar conditions, the same model infers the presence mainly of molecular H 2 O, implying a significant difference in physiochemical behavior between simple and complex hydrous

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“…If bubbles or dimples (bubbles nucleated on the inner surface of capsule) existed in the run product glasses, the charges are judged as water saturated at that experimental condition. The third method involves extrapolation (at constant pressure) of water undersaturated liquidus toward water saturated liquidus in temperature-X H2O plane (e.g., Burnham andJahns 1962, Eggler andBurnham 1984). Internally heated pressure vessels, IHPVs, have been widely used for the above high pressure experiments conducted at below 10,000 bar.…”

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confidence: 99%

“…It is noted that bulk water content of the albite glass 439L (6.5 wt.% H20) agrees with previously reported water solubility at 2,000 bar (6.4 wt. %, Burnham 1975). However, I conclude that the mean value (5.6 wt.…”

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Re-examination of Water Solubility in Albite Melt.

Miyagi

1995

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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Introduction. It has been recognized that water in magma controls physical properties and explosive Nn+tiv.n ~nv. ivn+nvnn +~n inn+nv n~~nn+n r~nnn vnIn 11 LL LA1 . 1' Vl iiio aiv.G, u11G vv a~Gi aiic.~J Niiaa~ ! Glationships, especially for solidi and liquidi, viscosity of silicate melts, diffusion coefficients, rates of nucleation and growth of crystals. Exsolved water, causing volume expansion of magma, results in explosive volcanism. A critical depth exists where a hydrous magma begins to nucleate aqueous bubbles. It is to be emphasized that solubility of water in silicate melt decreases dramatically with decreasing water pressure, especially at below 2,000 bar. Accordingly, once magma reached the critical water pressure, nature of the magma thereafter will be controlled by the water solubility curve. Therefore, water solubility in silicate melts is one of the most important parameters in order to understand the mechanism of eruption and to

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Water and magmas; a mixing model

Cited by 346 publications

References 8 publications

Heat capacity, configurational heat capacity and fragility of hydrous magmas

Heat capacity, configurational heat capacity and fragility of hydrous magmas

Melting phase relations in the systems Mg2SiO4–H2O and MgSiO3–H2O and the formation of hydrous melts in the upper mantle

Re-examination of Water Solubility in Albite Melt.

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