Lithogenesis of Hydrothermal Clays as Reflection of Deep Metalliferous Fluids Influence (Southern Kamchatka)

Abstract

On the basis of well drilling and prospect-hole digging and detailed level-by-level approbation the lithological structure of hydrothermal clays of main thermal fields of Pauzhetka system and Koshelevsky volcano is investigated. The hydrothermal clays form a uniform geological body, which have block-layered structure, thickness from 1.5 to 3.0 m or more, and extent more than 500-1000 m. The structure of hydrothermal clays depends on structure of primary rocks, hydrodynamical type of hydrothermal system, a temperature conditions, geochemistry of thermal waters, and other factors. Mineralogical-geochemical criteria of allocation of horizons of hydrothermal clays – as the general and separate for some thermal fields – are received. The model of rocks transformation to hydrothermal clays, as reflection of influence of deep metalliferous fluids on hypergenesis zone of modern hydrothermal system, is offered. This work was supported by the Russian Foundation for Basic Research (project no. 19-05-00102) and by Presidium of the Far East Branch of RAS (project no. 18-2-003).