Evolution of gold sources in the process of formation of gold deposits (evidence from Eastern Yakutia)

In contrast to the established ideas about the relationship of gold mineralization with any specific source, a model is proposed for the evolution of different sources during the formation of geological structures in the eastern framing of the Siberian Platform. The model is based on the calculation of regional clarkes of sedimentary, igneous rocks and minerals with the allocation of stratigraphic levels of primary gold enrichment in sedimentary rocks. The poly-stage and multi-stage nature of the evolution of sources is established through the redistribution of gold in the composition of sedimentary rocks and minerals under the influence of various endogenous heat and mass transfer agents, in particular, under the influence of carbonatites. The main condition for the localization of gold mineralization in the region is the presence of levels of primary supraclarke gold concentrations in turbidites R3, C3—P1, T3 of the deltaic facies of submarine slopes. The main gold concentrators in sediments are marcasite and pyrite. Under the influence of various heat and mass transfer agents, gold is redistributed along the heat flow front, forming zones of dispersed mineralization with its high contents in pyrite and arsenopyrite. Then, under the conditions of late superimposed hydrothermal-metasomatic processes, gold-bearing pyrites and arsenopyrites are released from most of the gold, which appears in the composition of ores of the late stage of ore formation in the form of visible gold particles.