Temperature-pressure plane for albite composition

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ID: 293021
1960
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Abstract
The reaction, albite = jadeite + quartz, has been studied between 15 and 25 kilobars, 600 and 1,000 degrees C. Two systems of generating pressure were used with mutually consistent results: a "simple squeezer," and a nitrogen system with hydrostatic pressure. The equilibrium line is given by the relation, P = 6,000 (+ or - 500) + 20 (+ or - 2)T, where P is in bars, T in degrees centigrade. This is in good agreement with the curve of Kelley and others based on thermochemical data; jadeite and quartz lie on the high-pressure side of the boundary. The melting curve of albite has been followed to 15 kilobars; it may be represented by the relation, T = 1,115 + 0.011P. The rise of melting temperature with pressure is smaller than had been estimated from the difference of volume between crystal and glass at ordinary temperature.
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Authors A. F. Birch, Pierre Lecomte
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Journal american journal of science
Year 1960
DOI
10.2475/ajs.258.3.209
URL
https://doi.org/10.2475/ajs.258.3.209
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