The P-dependence of the liquid structure and diffusion dynamics of Na2O-SiO2 binary solutions and jadeite at 6000 K was studied using a multicomponent ion-dynamics computer simulation. In liquid jadeite, P increases cause sharp increases in the diffusivities of Al, Si and O ions; a maximum diffusivity (implying a minimum viscosity) was found near 300 kbar. For Na+, however, the pressure coefficient is strongly negative. In the binary silicate solutions, there was a decrease in anomalous P-induced increases in diffusivity as Na2O increased. At low P the coordination numbers of Si and Al are both 4, but these increase systematically with increase in P, reaching average values of 5 for Si at approx max. oxygen diffusivity. -R.A.H.
|Original language||English (US)|
|Title of host publication||Bulletin de Mineralogie|
|Number of pages||9|
|State||Published - 1983|
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Environmental Science(all)