Abstract

Computer programs have been developed for the Apple Macintosh computer that are designed to facilitate metamorphic petrology calculations and to explore the tectonic significance of P-T-t paths through thermal modeling. Programs for petrologic calculations include Reaction, which calculates reactions among phase components, Tetplot, which plots three- and four-component tetrahedral phase diagrams in single and stereoscopic views, and rhermobarometry, which calculates and plots lines of constant equilibrium constant for real mineral data and includes a large fraction ofall published calibrations of commonly used thermometers and barometers. Program Gibbs is a generalized algorithm to perform P-T-X-M (pressure-temperature-composition-mineral abundance) phase equilibria calculations. Two programs model diffusion in garnet: Garnet Diffusion, which performs Fe-Mg diffusion calculations, and DiffGibbs (siffusion + Gibbs), which performs four-component diffusion calaulations and supports complex boundary conditions for the garnet.

Thermal modeling programs include contact, which simulates contact metamorphism, and Thicken, which simulates one-dimensional crustal thickening of an orogen.

A 200-page program manual and tutorial is available to assist the interested user or to use as the basis of class exercises.

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