Abstract
The distribution of mineral associations in near-veined zonal propylite-beresite metasomatic columns of mesothermal Bericul gold-ore deposit was analyzed. However, the polymineral composition in the inner (axial and adjacent with it rear) zones is inconsistent to the existing metasomatic column theoretical model. According to Korzhinskii metasomatic zoning theory, implied monomineral (quartz) and binary-mineral (quartz, sericite) compositions are characteristic of axial and rear zones, respectively. In common with above- mentioned facts, the zoning formation of differential component mobility is influenced by two additional factors: counter diffusion of components from fractured fluids into pores and diffusion mechanism of mass transfer it's from pores fluids into fractured of rock-fluid systems.
Highlights
Near-veined zonal metasomatic aureolas involve both beresite and propylite metasomatite formations in mesothermal gold-ore deposits
Near-veined metasomatic columns [6] with typical mineral zoning formed in all rocks
The described rock hydrothermal alterations during the deposit formation involve factors determining the specific composition of neocrystallisation and the structure of near-veined metasomatic columns
Summary
Near-veined zonal metasomatic aureolas involve both beresite and propylite metasomatite formations in mesothermal gold-ore deposits. Taking into consideration the previous 50-year observation data [2], the rear zone of naturally-occurring near-veined metasomatic columns are composed of mineral enriched rocks – quartz, sericite, carbonates, pyrite (sulphides). This rock is termed as beresite too. The investigation of naturally-occurring metasomatic columns could prove how the theory of nearfractured (near-veined) metasomatic zoning responds to the natural process itself, as well as the reasons of above-mentioned misunderstanding. The research involved the investigation of the wallrock alterations in the mesothermal quartz-veined Bericul gold-ore deposit.
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