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Fusion of the binary mixture : Clinopyroxene
- Plagioclase
When R1 reaches the solidus temperature, it starts to melt, according to the eutectic reaction: Di + An = Liq. Di + An = Liq.The eutectic melt produced has a different composition to R1.The amount of Clinopyroxene in the rock decreases faster than that of plagioclase. R1 moves, to the right, along the solidus curve. When all the clinopyroxene is consumed by the reaction, the eutectic melting reaction stops.If the temperature continues to rise, the anorthite melts and changes the composition of the magma, whose composition follows the liquidus curve. The proportion of anorthite crystals decreases until it disappears: the L1 liquid then has the same composition as the R1 rock.
