Abstract
The thermoelastic analysis of the possible stable stress-free equilibrium states of growth twins is shown to be the basis for a new technique of geobarothermometry. The detailed study of a cyclic cross-shaped twin in low quartz exemplifies the procedure. To explicitly determine the barothermometric function, the simultaneous dependence upon the external pressure and temperature of the lattice-parameter ratios c/c0 and a/a0 of quartz has been calculated; we present a five-parameter, temperature-corrected version of the equations proposed by Thurston (1967) for extrapolating to high pressures the behavior of lattice parameters of crystalline solids in isothermal compression.
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