DOI 10.21440/2307-2091-2017-2-13-22 Publication Date 11.07.2017
Gold-bearing objects of hypogene-supergene type in the Urals. Convergence of signs of their difference from ore-bearing weathering crusts pdf
A. G. Barannikov, O. B. Azovskova
At the present stage, gold-sulphide-quartz objects of a veined type are not enough to allow successful implementation of prospects for expanding the resource base for ore gold within the Ural region. It is necessary to orient prospecting and exploration work to identify and evaluate new (non-traditional) types of gold mineralization. These include objects of hypogene-supergene type (HST), established in recent years within the ore-bearing structures of the Urals. The term "hypogene-supergene" reflects such a type of gold deposits, in the formation of which endogenous and exogenous ore-forming processes occurred approximately in the same time and space. The article describes the characteristics of some HST objects located in the Middle and Northern Urals, the features of their geological structure, and mineralogical and geochemical indications of ore content. The peculiarity of HST objects manifests in the following: peculiarities of the form and conditions of occurrence of ore deposits (plastoid and lenticular forms predominate); Absence of distinct lithological boundaries of ore bodies; The dominance of small and fine gold, a wide range of variations in the samples; "Non-standard" structure of geochemical ore haloes. The complexity of separation of clay rocks, corresponding to hydrothermal low-temperature metasomatites and chemical weathering crusts, consists in the necessity of substantiating their identifying features (both similarities and differences). A number of these features have inherent convergence. In addition to geological, mineralogical-petrological and geochemical features, the study of typomorphism and petrochemical typology of native gold becomes important. The authors argue that an objective assessment of the relative role of low-temperature hydrothermal metasomatites of the argillizite formation and products of chemical weathering has, at the present stage, not only scientific, but also applied significance for the purposeful conduct of geological exploration work.
Keywords: gold; argillizites; weathering crust; hypogene-supergene type; convergence.
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