СОСТАВ И УСЛОВИЯ ФОРМИРОВАНИЯ ТИТАНОМАГНЕТИТ-ИЛЬМЕНИТОВОГО ОРУДЕНЕНИЯ В ДВУПИРОКСЕНОВОМ ГАББРО МЕДВЕДЕВСКОГО МЕСТОРОЖДЕНИЯ (ЮЖНЫЙ УРАЛ). I. ПЕТРОХИМИЧЕСКАЯ И ГЕОХИМИЧЕСКАЯ ХАРАКТЕРИСТИКА ПОРОД И РУД

In this paper based on new petrochemical and geochemical data with specificity in the compositions of rock-forming and ore minerals were determine the conditions of formation of Ti-Fe-V mineralization in the two-pyroxene gabbro of Medvedevskoje deposit. Two stages of formation of abundant mineralization in two-pyroxene gabbro as well fs in the rhythmically stratified amphibole-saussuritizated gabbro of mentioned deposit were distinguished: early cumulatively-magmatic stage and late-magmatic (subsolidus) stage. Staging of ore-genesis during the late-magmatic phase is related to the non-equilibrium of residual fluidized melt enriched with water and chlorine with regard to the previously allocated primary rock-forming and ore minerals (pyroxene, plagioclase, titanomagnetite and ilmenite) which formed a primary magmatic frame and layering of ore-bearing rocks.