Physics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..769s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 3, pp.769-777
Physics
5
Scientific paper
Electrical conductivity of the following molten silicate systems (in mol%): 60SiO 2 -40Na 2 O; 65SiO 2 -35Na 2 O; 75SiO 2 -25Na 2 O; 78SiO 2 -22Na 2 O; 72SiO 2 -24Na 2 O-4CaO; 66SiO 2 -19Na 2 O-15H 2 O; and an anhydrous and hydrous (4 wt% H 2 O) Mt. Erebus lava, have been measured as a function of temperature (to 1000°C) and pressure (to 1.3 kbar). The anhydrous soda-rich melts have a positive pressure coefficient of conductivity to ~200 bars and beyond this pressure the pressure coefficient is small and negative. Addition of water lowers the conductivity and gives rise to a negative pressure coefficient at the highest temperatures. The conductivity of hydrous Mt. Erebus lava passed through a maximum with increasing temperature at constant pressure. These phenomena are interpreted in terms of explanations of similar phenomena found in molten salt and aqueous electrolyte solutions.
Satherley John
Smedley Stuart I.
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