Viscosity and structural changes of albite (NaAlSi3O8) melt at high pressures

Details Viscosity and structural changes of albite (NaAlSi3O8) melt at high pressures Viscosity and structural changes of albite (NaAlSi3O8) melt at high pressures

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..41...87k&link_type=abstract

Earth and Planetary Science Letters, Volume 41, Issue 1, p. 87-90.

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32

Scientific paper

Viscosity of anhydrous albite melt, determined by the falling-sphere method in the solid-media, piston-cylinder apparatus, decreases with increasing pressure from 1.13 × 105 P at 1 atm to 1.8 × 104 P at 20 kbar at 1400°C. The rate of decrease in viscosity is larger between 12 and 15 kbar than in other pressure ranges examined. The density of the quenched albite melt increases with increasing pressure of quenching from 2.38 g/cm3 at 1 atm to 2.53 g/cm3 at 20 kbar. The rate of increase in density is largest at pressures between 15 and 20 kbar. The melting curve of albite shows an inflexion at about 16 kbar. These observations strongly suggest that structural changes of albite melt would take place effectively at pressures near 15 kbar. Melt of jadeite (NaAlSi2O6) composition shows very similar changes in viscosity and density and a melting curve inflexion at pressures near 10 kbar. Difference in pressure for the suggested effective structural changes of albite and jadeite melts is 5-6 kbar, which is nearly the same as that between the subsolidus reaction curves nepheline + albite = 2 jadeite and albite = jadeite + quartz. The structural changes of the melts are, however, continuous and begin to take place at pressures lower than those of the crystalline phases.

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