Mathematics – Logic
Scientific paper
Dec 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960gecoa..21...99c&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 21, Issue 1-2, p. 99-109.
Mathematics
Logic
8
Scientific paper
id="ab1"The P—2T field in which a phase or assemblage of phases may be synthesized need not be identical with that in which it is stable. This proposition is illustrated by studies in the system Al2,O2-4SiO2a2 under hydrothermal conditions. Three different starting materials have been used, (amorphous Al2O2-quartz, kaolinite-amorphous silica, kaolinite-quartz) and three significantly different synthesis diagrams result. None can be said to represent stable equilibrium but petrological observations indicate that results using kaolinite and quartz, (the closest approach to natural starting materials) may approach most closely to equilibrium conditions. With this starting material at 30,000lb/in2 kaolin passes to pyrophyllite at 420°C, pyrophyllito to an andalusite-like phase, (here called X-andalusite, possibly the "AS(H)-II" of ARAMAKI and ROY) at 470°C and X-andalusite to mullite at 525°C. The writers believe that, due to prohibitive kinetic aspects of boundary reversal, it may be impossible to establish the equilibrium relations between sillimanite and andalusite by synthetic methods.
Carr R. M.
Fyfe William S.
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