ROCK-FORMING MINERALS AND PETROGENESIS OF NICKEL-BEARING NORITE- DIORITE INTRUSIONS OF VORONEZH CRYSTALLINE MASSIF

Abstract

A detailed investigation was made of the typomorphic and chemical characteristics of the rock-forming minerals in norite-diorite intrusions in the Voronezh crystalline massif. The rocks of the intrusions are characterised by a highly magnesic composition of the femic minerals, a low calcium content in the plagioclases and the absence of concealed stratification. The temperature and pressure conditions governing the evolution of the magmatic melts are determined. An assimilation model of the formation of the norite-diorite massifs is substantiated.