A redetermination of equilibrium relations between kyanite and sillimanite

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ID: 294205
1961
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Abstract
The equilibrium curve between kyanite and sillimanite has been established by quenching experiments at temperatures between 1000 degrees C. and 1500 degrees C. and pressures between 17 and 24 kilobars. The curve is given by the expression P = 4.1 + 13.2 X 10 (super -3) T, where the pressure P, is in kilobars and the temperature, T, is in degrees Centigrade. There is some evidence that the phase boundary may depart from linearity at low temperatures, but no quantitative estimate of the amount of curvature can be obtained from present data. If kyanite forms stably in nature, pressures of nearly 10 kilobars are required. This is equivalent to the weight of about 30 km. of overburden. Such great depths of burial are not required if pressure is contained by the strength as well as by the weight of the overlying rock. It is suggested that "tectonic overpressures" of a kilobar or more may exist in rocks which are undergoing deformation.
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openalex_W2334181955 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Sydney P. Clark
Journal american journal of science
Year 1961
DOI
10.2475/ajs.259.9.641
URL
https://doi.org/10.2475/ajs.259.9.641
Keywords Keywords not found

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