triangle NaAlSi 3 O 8 CaAl 2 Si 2 O 8 CaMgSi 2 O 6 Di An Ab Plagioclase

Ternary phase diagram for melting the system NaAlSi3O8-CaMgSi2O6-CaAl2Si2O8 at 0.1 MPa pressure. Temperature is in degrees Celcius and composition is in weight percent. Congruent melting temperatures for pure Albite (Ab), pure Diopside (Di), and pure Anorthite (An) are shown. The liquidus (saturation) surfaces for plagioclase (Ab-An solid solution) and diopside are shown by temperature contours. The binary cotectic curve where the two saturation surfaces meet is also shown. Drag the temperature slider on the right to show isothermal sections through the diagram. Once the slider is selected, you may use up and down arrow buttons to have more control over the speed of temperature change. Click on the "Coordinates" button to see the compositions of points in the diagram as the mouse is moved over the diagram. Click on the "Show Phases" button to see the equilibrium phase assemblages for bulk compositions given by the mouse position as the mouse is moved over the diagram. Click on the diagram to hold a particular bulk composition. To see how the phase assemblage changes for the selected bulk composition (shown by a white circle), click on the "Change T" button and use the temperature slider. To cancel the selected bulk composition, click on the "Animate" button.