The Glafirinskoe and related skarn Cu-Au-W-Mo deposits in the Northern Altai, SW Siberia, Russia: Geology, igneous geochemistry, zircon U-Pb geochronology, mineralization, and fluid inclusion characteristics

•The Glafirinskoe and related deposits belong to a regional Early Paleozoic belt of Cu-Au-Mo skarn and porphyry deposits.•The deposits are related to post-collisional high-K calc-alkaline to shoshonitic intrusions.•Isotopic U-Pb zircon dating reveals Early Ordovician ages of the parental intrusions.•The deposits comprise W and/or Mo mineralization defining their Cu-Au(-Mo-W) metallogenic type.•Mineralization was formed by high- to low-salinity aqueous-chloride and aqueous-carbonic fluids.