The effect of P2O5 on the viscosity of haplogranitic liquid

Dingwell, Donald B.; Knoche, Ruth; Webb, Sharon L.

doi:10.1127/ejm/5/1/0133

Cited by 87 publications

(59 citation statements)

References 23 publications

(26 reference statements)

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“…This mechanism explains the decrease of viscosity caused by F in silicate melts DINGWELL, 1989), and it might also be responsible for the effect of F on diffusion coefficients. An extensive discussion of the physical properties of F-containing melts and their possible relationship to melt structure can be found in the paper by DINGWELL (1985).…”

Section: Applicationsmentioning

confidence: 99%

“…Concentrations of several wt.% are reported in high-fluorine rhyolites (CONGDON and NASH, 1988) and in ongonites ( KOVALENKO, 1973). Similar to water, the presence of F strongly reduces the viscosity of silicate melts ( DINGWELL et al, 1985;DINGWELL, 1989) and increases diffusion coefficients ( DINGWELL, 1985). Even small amounts of F in the order of 1 wt.% will therefore significantly change the transport properties, mobility, and eruption behavior of such magmas.…”

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confidence: 99%

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Fluorine in silicate glasses: A multinuclear nuclear magnetic resonance study

Schaller

Dingwell

Keppler

et al. 1992

Geochimica et Cosmochimica Acta

149

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Abstract-Anhydrous nepheline, jadeite, and albite glasses doped with F as well as hydrous F-containing haplogranitic glasses were investigated using "F combined rotation and multiple-pulse spectroscopy; 19F + 29Si cross-polarization/magic angle spinning (MAS); and high-power r9F decoupled 29Si, 23Na, and 27A1 MAS nuclear magnetic resonance methods. Fluorine preferentially coordinates with Al to form octahedral AIF:-complexes in all glasses studied. In addition, F anions bridging two Al cations, units containing octahedral Al coordinated by both 0 and F, or tetrahedral Al-F complexes might be present. The presence of Si-F bonds cannot be entirely ruled out but appears unlikely on the basis of the 19F + 29Si CP/MAS spectra. There is no evidence for any significant coordination of F with alkalis in the glasses studied. 23Na spectra are identical for the samples and their F-free equivalents and the spectra do not change upon decoupling of 19F. The speciation of F in the hydrous and anhydrous glasses appears to be very similar. Over the range of F contents studied (up to 5 wt.%), there seems to be hardly any dependence of F speciation on the concentration of F in the samples. The spectroscopic results explain the decrease of the viscosity of silicate melts with increasing F content by removal of Al from bridging AlO,-units due to complexing with F, which causes depolymerization of the melt. The same mechanism can account for the shift of the eutectic point in the haplogranite system to more feldspar-rich compositions with increasing F content, and for the peraluminous composition of most F-rich granites. Liquid immiscibility in F-rich granitic melts might be caused by formation of (Na,K),AlF, units in the melt with little or no interaction with the silicate component.The presence of F in granitic melts might increase the solubility of high field strength cations by making nonbridging 0 atoms available which form complexes with these cations. INTRODLJCPIONFLUORINE IS ONE OF THE MOST important volatile components of natural magmas, both in mantle-derived melts (e.g., lamproites) and in highly fractionated granitic magmas. Concentrations of several wt.% are reported in high-fluorine rhyolites (CONGDON and NASH, 1988) and in ongonites ( KOVALENKO, 1973). Similar to water, the presence of F strongly reduces the viscosity of silicate melts ( DINGWELL et al., 1985;DINGWELL, 1989) and increases diffusion coefficients ( DINGWELL, 1985). Even small amounts of F in the order of 1 wt.% will therefore significantly change the transport properties, mobility, and eruption behavior of such magmas. The correlation between high concentrations of certain trace elements (Sn, Zr, Nb, Ta, U, Th, etc.) and high F contents in granites and granitic pegmatites (STEMPROK, 1982) has stimulated the investigation of phase equilibria in F-containing granitic systems. MANNING ( 198 1) has shown that F strongly lowers both solidus and liquidus temperatures in the haplogranite system and causes a shift of the eutectic point towards more feldspar-rich...

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Section: Applicationsmentioning

confidence: 99%

mentioning

confidence: 99%

Fluorine in silicate glasses: A multinuclear nuclear magnetic resonance study

Schaller

Dingwell

Keppler

et al. 1992

Geochimica et Cosmochimica Acta

149

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“…The crucibles were heated in air and, to limit further possible changes in FeZ+/Fe 3+ ratio, the heating Richet and Bottinga (1984a) indicate cooling rates of a few K/s through the glass transition in our experiments. Viscosity measurements on stable liquids were performed in air with the concentric cylinder viscometer described by Dingwell (1989). Measurements on supercooled liquids were also made in air, with a fiber-elongation method, as described by Webb and Dingwell (1990b), and with the creep apparatus described by Neuville and Richet (1991).…”

Section: Experimental Methodsmentioning

confidence: 99%

Thermodynamic and rheological properties of rhyolite and andesite melts

Neuville

Courtial

Dingwell

et al. 1993

Contr. Mineral. and Petrol.

Self Cite

102

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Abstract.The heat capacities of a rhyolite and an andesite glass and liquid have been investigated from relativeenthalpy measurements made between 400 and 1800 K. For the glass phases, the experimental data agree with empirical models of calculation of the heat capacity. For the liquid phases, the agreement is less good owing to strong interactions between alkali metals and aluminum, which are not currently accounted for by empirical heat capacity models. The viscosity of both liquids has been measured from the glass transition to 1800 K. The temperature dependence of the viscosity is quantitatively related to the configurational heat capacity (determined calorimetrically) through the configurational entropy theory of relaxation processes. For both rhyolite and andesite melts, the heat capacity and viscosity do not differ markedly from those obtained by additive modeling from components with mineral compositions.

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“…This technique yields absolute viscosities and has been checked against the viscosity of NBS 711 glass. It has been demonstrated that, over the range of 109-1011 Pa s, viscosity can be determined with an accuracy of + 0.1 log~o Pa s. Details regarding the theory for the micropenetration technique can be found in Dingwell et al ( 1992Dingwell et al ( , 1993.…”

Section: Viscosity Measurementsmentioning

confidence: 99%

“…The furnace, the setup and the computer interface together with the exact procedure and calibration are described by Dingwell and Virgo (1988) and Dingwell ( 1989aDingwell ( , b, 1990. With this technique a temperature range from 800 ° to 1650 °C and a viscosity range from 10 ° to 105 Pa s can be covered.…”

Section: Viscosity Measurementsmentioning

confidence: 99%

Non-linear properties of supercooled liquids in the system Na2OSiO2

et al. 1994

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The physical properties, viscosity, density, heat capacity and thermal expansivity, of relaxed supercooled liquids in the temperature range just above the glass transition have been determined for ten compositions along the compositional binary Na20-SiO2, in the range of 2-45 mole% Na20, by a combination of scanning calorimetry, dilatometry and micropenetration viscometry. The viscosity, density, heat capacity and thermal expansivity in the glassy state have also been determined.The heat capacities illustrate a linear composition dependence for the glassy state and a smooth but strongly non-linear composition dependence for the supercooled liquid state. The thermal expansivities were determined by dilatometry up to the glass transition and, by a normalized comparison of relaxation behavior in the glass transition interval, to temperatures ~ 50 °C above the glass transition. The expansivity is a linear function of the molar composition in the glass but a strongly non-linear function of molar composition in the supercooled liquid.The viscosity data just above the glass transition temperature, combined with data from high temperature using the concentric cylinder method, illustrate that the composition dependence of viscosity is strongly non-linear and exhibits an inflection as a function of composition. The glass transition temperature, taken as the peak temperature of the calorimetric measurements, is not in general an isokom in this system.The data for these property determinations in the Na20-SiO2 system provide much improved constraints on the partial molar properties of SiO2 liquid and partial molar properties of the SiO 2 component in silicate melts. The complex behavior of the transport properties, i.e. the glass transition temperature and the viscosity, point to complexities in viscous flow beyond that of simple binary mixing of the Na20 and SiO2 components.

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The effect of P2O5 on the viscosity of haplogranitic liquid

Cited by 87 publications

References 23 publications

Fluorine in silicate glasses: A multinuclear nuclear magnetic resonance study

Fluorine in silicate glasses: A multinuclear nuclear magnetic resonance study

Thermodynamic and rheological properties of rhyolite and andesite melts

Non-linear properties of supercooled liquids in the system Na2OSiO2

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