Hi Dave,
Citing the last sentence of your abstract
" However, stable triple point assemblages may be possible in
relatively unsual, highly aluminous compositions."
I still can't see how you get triple point assemblages from such
compositions. Pyrophyllite breaks down at about 400 C, well below the
triple point, which produces andalusite or kyanite. If the P-T path
reaches the triple point, nothing much will happen, for kinetic
reasons.
I think, there's actually a better (if any) chance of getting triple
point assemblages from non-isochemical reactions or even retrograde
reactions.
Cheers, Juergen
J. Reinhardt
Dept. of Geology
University of Natal
Durban, 4041
South Africa
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