Литосфера (Dec 2015)
Composition and formation conditions of ilmenite and titanomagnenite mineralization in two-pyroxene gabbro Medvedevskoje deposit (Southern Urals). I. Petrochemical and geochemical characteristics of rocks and ores
Abstract
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.
