Formation conditions of the Rudny Altai metallogenic province

摘要: The results of previous geological, petrochemical, and metallogenic surveys conducted from the 1960s to 1990s provide geological tectonic basis this study. unique mineral deposits Rudny Altai province were formed in Middle Paleozoic (S2–C1) at junction between different structures Altai–Mongolian terrane: Alei–Charysh–Tigirek rift (in north) with Korgon–Markakol’ island arc Belaya Uba–Maimyr intra-arc trough southwest). structural–formational zone that these evolved as a magmatic was characterized by formation granite–greenschist arches, volcanoplutonic magmatism high heat fluid flow (greenschist-facies metamorphism Upper Silurian–Upper Devonian rocks deposition pyrite-bearing hydrothermal–sedimentary horizons, VMS copper–VMS isolated base-metal ore bodies). tectonomagmatic history can be subdivided into several stages: Ludlow–Emsian, Late Emsian–Givetian, Frasnian–Early Famennian, Famennian–Early Visean, Visean–Serpukhovian. is represented volcanic andesite–dacite–rhyolite (early stage), basalt–rhyolite (Late Emsian–Eifelian), basalt–andesite–rhyolite series Visean). Volcanosedimentary strata (until Givetian age) turbidites up 3–5 km thick deposited interarc trough. Because their metastable behavior, became actively involved ion-exchange reactions formational waters, whereas differences hydraulic head arches troughs created favorable conditions for transport metamorphic fluids, thermal gradient promoted thermodiffusion divalent species Mg, Pb, Zn, Cu, etc. toward high-temperature development high-Mg metamorphic–metasomatic alteration VMS–base-metal mineralization. As result, structural genetic types formed. Temperatures (200–400°C) controlled effect pyrite dissolution replacement reactions. composition regional zoning defined based on position respect interarch chemistry metal-extraction environment.