Melt systems as the basis of paragenetic analysis of mineral assemblages in igneous rocks

The paper considers the simplified PH2O-T-projection and crystallization scheme of the q-ne-kp-fo-mo-aq system reflecting the process of the magmatic rock crystallization. The rocks are compositionally marginal between the normal series and the alkaline one, and from the normative quartz group to the normative montichellite one.