P-T Stability of Phlogopite, K-Richterite and Phengite, as a Source of Potassium in the Mantle - Origin of Potassium-rich Silica-deficient Igneous Rocks - page 355

Fig. 12.7 P-T projection of the reactions investigated in the join KAlSiO 4 CO 2 .

The 1 atm results are the same as Fig. 12.5 . The reactions leucite + sanidine + kalsilite (Lindsley
1966) and enstatite + magnesite

Mg 2 SiO 4 SiO 2

- - -

forsterite + CO 2 (Newton and Sharp 1975) are also shown.
Data points are in projections. Dashed lines are inferred. Phase abbreviations are the same in
Fig. 12.5 and additionally Mag magnesite (after Wendlandt and Eggler 1980)

→

Sa

Lc L
Fo

CO 2

Sa En
Fo L

Sa

CO 2

En L

CO 2

S 11

Sa+En+Fo+CO +L 2

Sa+Fo+CO +L 2

S 10

S 9

Sanidine + Forsterite Vapor
Vapor

Sa Fo
En L Sanidine + Enstatite

Enstatite + Liquid
Leucite + Liquid
Forsterite + Liquid
Liquid

CO 2

Sa Lc

Fo L
CO 2

1200 1225 1250 1275 1300 1325

o

Temperature ( C)

Fig. 12.8 Detail of reactions associated with singular points S 9 ,S 10 and S 11 in the join