KFMASH Grid w/AFM Topologies and MAD Examples. AFM digrams for a range of pressure and temperatures with the option of showing mineral assemblages at each P and T for a few selected ideal KFMASH bulk compositions. AFM petrogenetic grid based on the thermodynamic model dataset SPaC (version 4/2000) developed originally by Spear and Cheney (1989). AFM topologies were calculated by Frank Spear at temperatures every 4°C and at pressures every 200 bars following the procedures of Spear (1998). Because there are many (5168) AFM files, wait 30 seconds after you load this page for the files to download. Then move your mouse over the PT diagram on the left to see how the AFM topology changes. Click on the PT diagram to stop the animation at a particular temperature and pressure. Click the Animate button (upper right) to resume the animation.
Click on a bulk composition radio button to show the Mineral Assemblage Diagram (MAD - also known as "pseudosection), mineral assemblages, and modes for the selected bulk composition at each T and P. The bulk composition will appear as a small red dot on the AFM diagram. Again, you may click on the MAD (PT) diagram to stop the animation at a particular temperature and pressure. Click on the Toggle button to switch back and forth between the MAD diagram and the petrogenetic grid showing discontinuous KFMASH reactions. Reload the page to remove the MAD diagram and modes. If you click on the water radio buttton, water produced by dehydration reactions and lost from the rock is shown for the HighAl, X(Mg)=0.25 bulk composition in units of mole fraction of the total water lost or in units of volume fraction of water lost. Software to calculate the MAD diagrams (Gibbs2) and modes (MADPlotter95) were provided by Frank Spear.