Statistics – Applications
Scientific paper
Aug 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965gecoa..29..871w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 29, Issue 8, pp.871-892
Statistics
Applications
2
Scientific paper
Solid-liquid-vapor phase equilibria have been determined for parts of the system CaO-SiO 2 -CO 2 -H 2 O by delineating the phase fields intersected by the composition join CaCO 3 -Ca(OH) 2 -(SiO 2 + 4.3 weight per cent H 2 O) at 1 kilobar pressure between 600°C and 975°C. The phases encountered were: dicalcium silicate (C 2 S), Ca 2 SiO 4 ; calcite (CC), CaCO 3 ; portlandite (CH), Ca(OH) 2 ; spurrite (Sp), Ca 5 (SiO 4 ) 2 (CO 3 ) 2 ; caleiochondrodite (Ch), Ca 5 (SiO 4 ) 2 (OH) 2 ; liquid (L), with composition remaining close to the plane Ca 2 SiO 4 -CaCO 3 -Ca(OH) 2 ; vapor (V), with composition ranging between CO 2 and H 2 O. At the pressure of 1 kilobar, the following ternary univariant reactions, (2) and (3), and quaternary univariant reactions, (6), (7) and (8). were established at the temperatures indicated: (2) CH + Ch + V L ( E 2 ) at 774 ± 10° C ; (3) Ch + V C 2 S + L ( P 3 ) at 955 ± 10° C ; (6) CC + CH + Ch + V L ( E 6 ) at 637 ± 10° C ; (7) CC + Ch + V Sp + L ( P 7 ) at 677 ± 10° C ; (8) Sp + Ch C 2 S + L ( P 8 ) + V at 860 ± 10° C . The vapor in each reaction is high in H 2 O content. From these results and other published data a schematic equilibrium diagram for the whole system is constructed. A large field for spurrite extends down to 677°C on the vapor-saturated liquidus surface but wollastonite is not stable in equilibrium with both liquid and vapor below 1000°C at this pressure. The plane Ca 2 SiO 4 -CO 2 -H 2 O is a thermal divide; original liquids containing more SiO 2 than this plane yield only silicates and vapor on crystallization, whereas original liquids containing less SiO 2 than this plane can yield low temperature liquids precipitating hydrated and carbonated phases (synthetic carbonatite magmas). Applications to carbonatites and the thermal metamorphism of silicious limestones are discussed briefly
Haas L. Jr. J.
Wyllie Peter J.
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