The mineral–geochemical evidence of contact transformation of ores of the Dzhusinskoe pyrite–polymetallic deposit (Southern Urals)

Abstract

The Dzhusinskoe pyrite–polymetallic deposit is characterized by an abundant concentration of dykes of basic and intermediate rocks. Thermal metamorphism of ore-host rocks and the recrystallization of ore minerals are associated with the intrusion of post-ore dykes. A regular increase in the homogenization temperature from 156° at a distance from a dyke to 287–305°C in the contact zone was established. Highly saline (6.4–15.7 wt % NaCl eq.) CO₂–H₂O–NaCl fluids under high pressure (up to 1500 bar) can be associated with the processes of contact and regional metamorphism.