The diagram on the left shows the pressure-temperature conditions of reactions among Anthophyllite (Ath), Antigorite (Atg), Diopside (Di), Enstatite (En), Forsterite (Fo), Talc (Tc), Tremolite (Tr), Quartz (Qz) and Water (H₂O) based on experimental studies of chemical reactions among the minerals as summarized in the database of Berman (1988). Water is included in the experiments so that pressure P(total) = P_H2OO.

Each one of the 10 CaMgSi₂O₆-Mg₃Si₄O₁₁-MgO (Di-Tlc-MgO)mineral assemblage diagrams describes equlibrium in one of the 10 regions between the chemical reactions on the T-P diagram. The reactions listed along the curves on the T-P diagram will transform one equlibrium assemblage diagram to the next one. Use your knowledge of the effects of chemical reactions on assemblages to deduce which assemblage diagram belongs to which area on the T-P diagram. Use your mouse to drag each mineral assemblage diagram and drop it into the appropriate area on the T-P diagram. If you drop a ternary diagram onto the correct area, it will disappear from the possible selections and appear whenever you mouseover the destination area. Continue until you have matched all the assemblage diagrams to a region on the T-P diagram.

Constrain Metamorphic Temperatures