Geology, deep structure, magmatism, Au–Ag and Ag–Pb–Zn mineralization of the Chepchuginsky ore cluster (the Verkhoyansk-Kolyma mineragenic province)

Results of the investigation of the structure, magmatism, Au–Ag and Ag–Pb–Zn mineralization of the Chepchuginsky ore cluster located in the Myunkyulen mineragenic zone of the central part of the Verkhoyansk-Kolyma mineragenic province are presented. The ore cluster is localized in an extended latitudinal projection of the crystalline basement between slightly eroded massifs, manifested by gravitational minima and positive local magnetic anomalies of the zones of contact metamorphism. Structurally, the ore node is confined to the intersection of the Suntar regional fault of the Chepchugin anticline. The study of dikes showed a wide petrographic diversity of the rocks composing them (spessariters, diorite porphyry and rhyolite-porphyry). The igneous rocks of the ore field are geochemically specialized in lithophylic elements (B, Ba, Cr, Nb, Sc, Sr, V, Zr), while the content of chalcophylic (Cu, Gе, Sn, Zn, Pb) and siderophile (Ni, Co) elements is much lower. Early pyrite-arsenopyrite, middle polymetallic, and late silver-sulfosalt mineral associations were identified. The wide development and diversity of supergene minerals is typical, which suggests a significant prevalence of mineralization of galena, arsenopyrite, and sulfosalts in primary ores below the supergene zone. Differences in the mineral specialization of the Gaidar and Chepchuga sites have been identified. The Au-Ag type of mineralization with native gold in quartz veins and oxidation zones on silver-containing ores is developed at the Gaidar site. On the basis of the development of cassiterite, canfieldite, acanthite, as well as Pb, Ag, and Sb sulfosalts in the ores, it is assumed that the mineralization of the Chepchuga site is close to silver-polymetallic deposits. The metallogenic appearance of the ore cluster is associated with its position in the rear area of the marginal-continental Tithonian-Early Cretaceous Uda-Murgal and Albian-Late Cretaceous Okhotsk-Chukotka volcano-plutonic belts.

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