The effect of water on the viscosity of a synthetic calc-alkaline basaltic andesite

Robert, G.; Whittington, A. G.; Stechern, André; Behrens, Harald

doi:10.1016/j.chemgeo.2012.10.004

Cited by 28 publications

(25 citation statements)

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“…For these depolymerized compositions, after an initial increase up to _6 mol% of water, the Cpconf (Tg) strongly decreases as further H2O is added to the melt, suggesting, contrary to the case for polymerized compositions, that water would decrease the fragility. In the literature, the effect of H2O on melt fragility is still debated and both a decrease and an increase in fragility as a function of water content have been reported (Richet et al, 1996;Whittington et al, 2000;Romano et al, 2001;Whittington et al, 2001;Bouhifd et al, 2012;Robert et al, 2012;Di Genova et al, 2013). We derived the fragility variations as a function of water content for FR (Misiti et al, 2011;Di Genova et al, 2014) and AMS-B1 (Romano et al, 2001;Misiti et al, 2006) only.…”

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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show abstract

“…6 have been normalised to the temperature at which the viscosity of the Cl-free endmember is 10 12 Pa s. This decrease in viscosity is in contrast to the 0.9 log unit increase in viscosity observed by Baasner et al (2013) due to the addition of chlorine is also in contrast to the 0.2 log 10 unit increase in viscosity observed here when 0.8 mol% Cl 2 O -1 is added to an iron-free haplobasaltic melt. It must be noted that there may also be small variations in viscosity occurring in these melts due to variations in the water content (65-255 ppm) as the model of Robert et al (2013) calculates that an increase of 100 ppm water to nominally anhydrous calc-alkaline basaltic andesite melt will result in up to 0.1 log 10 unit decrease in viscosity in the high viscosity range.…”

Section: Viscositymentioning

confidence: 99%

Rheology and the Fe3+–chlorine reaction in basaltic melts

2014

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“…Viscosimetric measurements on hydrous silicate melt (e.g. Scaillet et al, 1996;Richet et al, 1996;Whittington et al, 2000;Giordano and Dingwell, 2003;Robert et al, 2013) as well as glass transition temperature (Tg used as a proxy for viscosity) determination in hydrous silicate glasses (e.g. Deubener et al, 2003;Giordano et al, 2005;Morizet et al, 2007) confirm this fact.…”

Section: Introductionmentioning

confidence: 67%