Island Arc and Collisional Mineralizations of the Degtyarsk―Karabash Massive Sulfide Zone, Middle Urals: Composition, Genesis, and Tectonic-Metamorphic Transformations

摘要

The Degtyarsk-Karabash massive sulfide zone (DKMSZ) is one of the key objects for deciphering the geological, geodynamic, and metallogenic evolution of the Urals in the Paleozoic. This is related to the fact that two-stage collision in this region juxtaposed litho-structural complexes formed in different geodynamic settings (oceanic spreading, island arc, collision) and characterized by different metallogenic specifics (Cr, Fe, Ti, V, Cu, Zn, Pb, W, Mo, Au, and Ag). This process provoked tectonic and metamorphic transformation of precollisional deposits (mainly, massive sulfide group), on the one hand, and generated the associated gold mineralization, on the other hand. This work is based on the following materials: (1) refined scheme of geological and geodynamic evolution of the DKMSZ, which made it possible to trace the relationships between lithostructural complexes of different geodynamic settings and associated mineralizations of different formations and genetic types; (2) additional data obtained for the past five years on relationships between massive sulfide copper and gold-base metal mineralizations within the DKMSZ and other regions of the Urals; (3) ther-mobarogeochemical interpretation of chemical composition of light-colored micas and tourmaline; (4) new data on wall-rock metasomatic rocks (hereafter, metasomatites) of different types of deposits (massive sulfide, massive sulfide base metal, gold-base metal, and gold ore).