Petrography and Mineralogy of Granitoids of the Elikchan Massif (North-East of the Verkhoyansk-Kolyma Orogenic Region)

Abstract

The article presents the results of a study of Elikchan granodiorite-granite massif with complex Sn-Au-Ag mineralization. It is shown that the massif localized in the zones of regional fault, where it was preceded and followed by subaerial volcanic outpourings. Considered typomorphic peculiarities of rock-forming, accessory, and restituir minerals of granitoids and petro- and geochemical features of the rocks. A polygenetic nature of the massif is documented, with the origination of parental melts of the amphibole-biotite granodiorites and granites from the lower and upper crustal protoliths, respectively, under the influence of deep heat and fluid fluxes rising from the metasomatized mantle to the magma-generation level. Geochemical specialization of granitoids on a wide range of ore elements characteristic of latite ore-magmatic systems has been established (Bi, As, Sb, Ag, Sn, W). It is shown that the crystallization of the granodiorites took place in conditions close to those of gold-bearing ore-magmatic systems, and the crystallization of the granodiorites took place in conditions close to those of gold-bearing ore-magmatic systems, and the crystallization of granites in the conditions close to those rare-metal ore-magmatic systems, what obyasnyat preformationist associated mineralization. An important criterion for the potential ore content of specific magmatic formations and its possible implementation is the regime of volatile elements.