Ternary Phase Diagram | Ternary Eutectic System | Di- Fo -An | Igneous Petrology | Geology 

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Ternary systems: Systems with 3 Components
1. Phase relations in ternary systems are more difficult to visualize due to added one more component i.e. (T-P-X-X) ,
2. System is then made isobaric so that system can be concieved in 3D
3. The simplest three-component systems are eutectic systems with no solid-solution.
4. We shall thus return to the Di-An eutectic system and add a third component: Mg2SiO4 (Fo, forsterite). Because olivine occurs in many basalts, the Di-An-Fo system is a more comprehensive basaltic model than Di-An or Fo-SiO2 separately
5. The top surface of the diagram is represented by a complex curved liquidus surface, similar to three hills with summits at Di, An, and Fo, respectively.
6. The hills slope down to valley bottoms, which are one-dimensional ternary extensions of the invariant binary eutectic points.
7. These valley bottoms are similar to streams in a topographic sense.
The streams converge to a ternary eutectic point M (analogous to a sinkhole) at the lowest point on the liquidus surface of the diagram
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