The viscosity of hydrous dacitic liquids: implications for the rheology of evolving silicic magmas

@article{Whittington2009TheVO,
  title={The viscosity of hydrous dacitic liquids: implications for the rheology of evolving silicic magmas},
  author={Alan G. Whittington and Bridget M. Hellwig and Harald Behrens and Bastian Joachim and Andr{\'e} Stechern and Francesco Vetere},
  journal={Bulletin of Volcanology},
  year={2009},
  volume={71},
  pages={185-199}
}
The viscosity of a series of six synthetic dacitic liquids, containing up to 5.04 wt% dissolved water, was measured above the glass transition range by parallel-plate viscometry. The temperature of the 1011 Pa s isokom decreases from 1065 K for the anhydrous liquid, to 864 K and 680 K for water contents of 0.97 and 5.04 wt% H2O. Including additional measurements at high temperatures by concentric-cylinder and falling-sphere viscometry, the viscosity (η) can be expressed as a function of… 
The effect of water on the viscosity of a synthetic calc-alkaline basaltic andesite
Abstract The viscosity of a series of 6 Fe-free, synthetic basaltic andesite liquids, containing up to 3.76 wt.% dissolved water, was measured in the range of the glass transition (10 8 –10 13  Pa s)
Rheology of lava flows on Mercury: An analog experimental study
We experimentally determined the rheological evolution of three basaltic analog compositions appropriate to Mercury's surface, during cooling, and crystallization. Investigated compositions are an
Heat capacity and viscosity of basaltic melts with H 2 O ± F ± CO 2
We determined the viscosity and heat capacity of a series of two basaltic liquids containing H2O, F, H2O+CO2, H2O+F, and H2O+CO2+F. One was a natural calc-alkaline basalt from Fuego volcano,
Experimental Crystallization of Undercooled Felsic Liquids: Generation of Pegmatitic Texture
The crystallization kinetics of silicate liquids were studied experimentally in the system haplogranite–B–Li–H2O, at variable degrees of undercooling and variable water concentration. We investigated
A simple model for the viscosity of rhyolites as a function of temperature, pressure and water content
Abstract In order to better constrain the viscosity ( η ) of high-silica rhyolite at low to moderate water contents ( X ), which represent water saturation at near-surface pressure–temperature ( P –
Density and Viscosity of Hydrous Magmas and Related Fluids and their Role in Subduction Zone Processes
We have developed density^viscosity^composition (r^m^X) models for natural aqueous fluids and hydrous melts, based on experimental data for silicate þ H2O, especially for the pressure (P) and
Transport properties of glassy and molten lavas as a function of temperature and composition
Abstract We provide measurements of thermal diffusivity (D), heat capacity (CP), and viscosity (η) for 12 remelted natural lavas and 4 synthetic glasses and melts, ranging in composition from
Pahoehoe to `a`a transition of Hawaiian lavas: an experimental study
Basaltic lavas collected at the Muliwai a Pele lava channel, built during 1974 as part of Mauna Ulu’s eruption on Kilauea’s east rift zone, have been studied to investigate the effect of cooling and
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 45 REFERENCES
The effect of water on the viscosity of a haplogranitic melt under P-T-X conditions relevant to silicic volcanism
Abstract The viscosities of hydrous haplogranitic melts synthesized by hydrothermal fusion at 2 kbar pressure and 800 to 1040° C have been measured at temperatures just above the glass transition and
Experimental temperature–X(H2O)–viscosity relationship for leucogranites and comparison with synthetic silicic liquids
ABSTRACT Viscosities of liquid albite (NaAlSi3O8) and a Himalayan leucogranite were measured near the glass transition at a pressure of one atmosphere for water contents of 0, 2·8 and 3·4 wt.%.
Non-Newtonian rheology of crystal-bearing magmas and implications for magma ascent dynamics
Abstract The eruptive dynamics of volcanic systems are largely controlled by the viscosity of deforming magma. Here we report the results of a series of high-temperature, high-pressure experiments at
Water and the viscosity of depolymerized aluminosilicate melts
To determine the effect of water on the rheology of depolymerized melts, we have measured the viscosity of two series of hydrated synthetic aluminosilicate melts analogous in bulk polymerization to
Viscosity of hydrous rhyolitic melts inferred from kinetic experiments, and a new viscosity model
Abstract Viscosity of hydrous silicate melts is a critical property for understanding magma transport, bubble growth, volcanic eruption, and magma fragmentation. We report new inferred viscosity for
High-temperature limits on viscosity of non-Arrhenian silicate melts
Abstract The prediction of viscosity in silicate melts, over the range of conditions found in nature, remains one of the most challenging and elusive goals in Earth Sciences. We present a strategy
The influence of H2O on the viscosity of a haplogranitic melt
Abstract The viscosity η of dry and hydrous haplogranitic melts (anhydrous normative composition: QZ28Ab34Or38) has been determined between 3 and 10 kbar and 800 and 1400 °C using the falling-sphere
Viscosities of hydrous leucogranitic melts: A non-Arrhenian model
Abstract An equation is presented for the calculation of the shear viscosity of hydrous (0-12.5 wt% H2O) leucogranitic melts from 102 to 1013 Pa·s. The equation is a multiple nonlinear least-squares
Water and the density of silicate glasses
Abstract A review of published and newly measured densities for 40 hydrous silicate glasses indicates that the room-temperature partial molar volume of water is 12.0 ± 0.5 cm3/mol. This value holds
...
1
2
3
4
5
...