Figure 8.05b. CaO-SiO2 variation diagram of fractional crystallization in the end-member Di-Fo-An system. Starting with a bulk composition of Di(30)Fo(60)An(10), shown as a black dot, liquid compositions produced by removing forsterite are shown (as orange dots) in steps of 5% of the original mass (PCS). Click on the "Show Forsterite Composition" radio button to see the composition of the solid being fractionated (removed). Click on the "Show Fractionation Line" button to show the linear relationship among forsterite, the bulk composition, and the liquids produced by fractionation.
Clicking on other radio buttons will show the liquids produced by removing forsterite from a bulk composition of Di(10)Fo(60)An(30). See Figure 8.04 to see both starting bulk compositions in the Di-Fo-An system.
Click on the "Variation Diagram" buttons to see MgO-SiO2 or Al2O3-SiO2 variation diagrams based on the same forsterite fraction data.
