Petrology

Reactions

ReactionsReactions is a small handy freeware for generation of all possible reactions between specified substances (pure minerals and components of solid solutions, oxides and chemical elements) with selection of the arbitrary set of linearly independent reactions. This program may be useful for education, for analysis of diagrams (petrogenetic grids and results of multi-equilibrium geothermobarometry), for balancing of reactions involving minerals with real compositions, for evaluation of solid solution end-members, etc.

PT_Gtrm

PT_Gtrm logo

PT_Gtrm is a program for fitting continental conductive geotherms to clouds of PT points, e.g. to results of geothermobarometric investigations of mantle xenoliths. Models of H.N. Pollack & D.S. Chapman (1977) and D. Hasterok D. & D.S. Chapman (2011) are used.

TC_Comb version 1.1

The new TC_Comb version 1.1 has been released. The most important improvement of the program is an extended support for calculations involving fluid components (H2O and CO2) and cordierite. A number of changes is associated with this support...

Approximation of reaction lines by single-segment parametric cubic Bezier curves

 Usage of parametric cubic Bezier curves on diagrams has a number of advantages if compared with traditional polyline representation (and with non-parametric curves)...

About permutational approach in geothermobarometry

 Let's assume that you have got a great number of micro-probe analyses from a small area of a sample/thin section (e.g. 10 Opx, 10 Grt, 5 Bt and 5 Pl) and are going to estimate P-T parameters using the THERMOCALC and AX programs, or by the TWQ package of R.G. Berman et al. Which combination of analyses demonstrates the "best" (the most closely-grouped) intersections of the curves? In this example, you must check 10×10×5×5=2500 possible combinations...

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