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Fig. 10.16 a Phase relations in the join Fo
Lc studied under 2.3 GPa [P(H 2 O) = P(Total)]
(Nag et al. 2007). b Course of crystallization of liquid in the join Fo
Di
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Lc studied under 2.3 GPa
[P(H 2 O) = P(Total)] (after Nag et al. 2007). The bold line with squares is a projected path of the
liquid as determined from the composition of glasses in equilibrium with crystalline phases
Di
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difference (Fig. 10.16 ). At 2.3 GPa phlogopite ss , kalsilite, and K-feldspar ss are
additional phases and leucite ss is completely absent. Microprobe analyses of glasses
in the join Fo
Lc at 2.3 GPa [P(H 2 O) = P(Total)] and variable temperatures is
projected on to this join from the H 2 O apex (bold line with solid squares)
(Fig. 10.16 b). Although projected paths of the melts are slightly off the phase
boundaries, nevertheless the crystallization trends are consistent with the observed
sequence of crystallization.
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Di
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