PROGNOSIS PROPERTIES OF ARGILLIZED ROCKS
Prognosis properties of metasomatic argillizites are based on the direct correlation between clay mineral compositions and zoning of these rocks and the productivity of associated ore bodies (Au, Ag, U, Be, Pb-Zn, Hg, Sb, CaF<sub>2</sub>, etc.). Processes of acidic alterations form ore-free halos of the primary kaolinite and smectite composition. While the ore-forming these kaolinite and smectite are replaced by the ore-accompaning K-Mg-Fe-bearing illite, chlorites, and mixed-layer minerals. In detail prospecting-exploration works there may be used diagrams of mineral composition and zoning of argillized rocks in gradation «rich ores - poor ores - ore occurrence». «Solfataric cap» over them frequently has the quartz-kaolinite-alunite-bauxite composition (with diaspore, boehmite, gibbsite). Regularities of mineral composition and zoning of argillization fields may be used for prospecting purposes to distinguish areas with potentially rich, ordinary or poor ores. In the regional scale argillized rocks of any composition testify for the low temperature endogenic processes.