THE PROBLEM OF CONCENTRATION AND DISPERSION OF ORE-FORMING AND PETROGENIC ELEMENTS IN GEOCHEMICAL SYSTEMS

Abstract

The paper considers regularities in concentration and dispersion of ore-forming and petrogenic elements in some natural geochemical systems. The structural-chemical basis of silicate ore-forming systems and its influence on migration of these elements within the systems are discussed. A principle of the structural-chemical interaction between the system and elements is proposed and substantiated. It is shown that the occurrence of elements in fields of both stabilization and destabilization of silica-oxygen bonds indicates that the first of the elements should be dispersed among silicate matrices of different types and the second are capable of forming autonomous complexes. The stability of Si-O groups, as well as that of Al-Si-O groups under intense silica condensation, is sometimes distorted. The formation conditions favorable for the structural-chemical heterogenization of systems with separation primarily of destabilizing components are considered. The principle of the structural-chemical interaction between the system and elements is shown to be highly useful for the study of evolving geochemical systems, particularly of intricate and important ore-forming systems.