Nonmodal Eutectic Batch Melting

Modal melting normally does not happen. Due to preferential melting of some minerals in the source rock, x must change. For example, a mantle rock may have 10% cpx, but the cpx may contribute 25% of the melt as a result of preferential melting of cpx, resulting the decrease of as a function of F during melting. 

Note that for modal melting, melting proportion is the same as the initial mineral proportion in the source (p =Xq). In this case, Eq. (1.10) reduces to 

---