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一、前言 霞石-六方钾霞石体系是成岩残余体系(Ne-Ks—Q)三元相图的重要组成部分。1937年,Bowen根据硅酸盐矿物结晶作用的特点,认为岩浆结晶分异过程中,随着含钙、镁、铁组分矿物的析出,结晶分异的最后残余熔体富含钾、钠、铝组分,因而提出了碱-铝硅酸盐体系(即NaAlSiO_4-KAlSiO_4-SiO_2)是成岩残余体系。这个体系引起岩石学、实验岩石学家的巨大兴趣,可以利用它来解释花岗岩及碱性岩的成因。
I. Introduction Nepheline-hexagonal karstifossite system is an important part of ternary phase diagram of diagenetic remnant system (Ne-Ks-Q). In 1937, according to the crystallization characteristics of silicate minerals, Bowen believed that in the process of the magma crystallization differentiation, the final residual melt of crystallization differentiation is rich in potassium, sodium, Therefore, it is proposed that alkali-aluminosilicate system (NaAlSiO 4 -KAlSiO 4-SiO 2) is a diagenetic residual system. This system has aroused the great interest of petrology and experimental petrologists and can be used to explain the genesis of granite and alkaline rocks.