PT  - JOURNAL ARTICLE
AU  - A. F. Koster van Groos
AU  - P. J. Wyllie
TI  - Liquid immiscibility in the system Na <sub>2</sub> O-Al <sub>2</sub> O <sub>3</sub> -SiO <sub>2</sub> -CO <sub>2</sub> at pressures to 1 kilobar
AID  - 10.2475/ajs.264.3.234
DP  - 1966 Mar 01
TA  - American Journal of Science
PG  - 234--255
VI  - 264
IP  - 3
4099  - http://www.ajsonline.org/content/264/3/234.short
4100  - http://www.ajsonline.org/content/264/3/234.full
SO  - Am J Sci1966 Mar 01; 264
AB  - A liquid miscibility occurs within the Quaternary system, Na 2 O-Al 2 O 3 -SiO 2 -CO 2 between Na 2 CO 3 -rich liquids and NaAlSi 3 O 8 -rich liquids. The vapor-saturated liquidus surface does not intersect the miscibility gap at low pressures, but with increasing pressure it undergoes two discontinuous shifts toward the CO 2 apex of the tetrahedron, produced by carbonation reactions in the system Na 2 O-SiO 2 -CO 2 . These position changes cause the vapor-saturated surface to intersect the miscibility gap. At 1 kilobar pressure on the join NaAlSi 3 O 8 -Na 2 CO 3 -CO 2 , the two-liquid field occurs at temperatures above 870 degrees C