Legkova G. The law-governed changes in composition of minerals from Pre-Cambrian rocks of the Ukrainian Shield

Objects of research:Chemical composition of minerals and their heterogenous status; minerals composition changes due to PT-conditions variations and radioactive impact; phenomenon of metamict transformation. Aims of research: Statement of the law-dependent changes of minerals chemical composition at micro- and macro levels and study of their nature. Methods of research: The main methods appllied are electron probe microanalyse and chemical analyse; as well as photoelectron, infrared, nuclear gamma-resonans spectroscopies. The dissertation is devoted to: the development of the dynamic links method for the quantitative assessment of the mineral composition changes; the clarification of the essence of the linear dependences among mineral components; the establishment of law-governed changes of mineral composition due to temperature, pressure, radiation, metamict transformations; on the above mentioned material the investigation minerals from Pre-Cambrian rocks related to the Middle-Dnieper, Dniester-Bug and Pryazov megablocks of the Ukrainian Shield. The existing laws of isomorphism are contributed with the notion of the transfer to more stable chemical complexes (compounds) on the basis of interconnected linear changes of some two minerals composition components. The linear character and peculiarities of changes of the amphibole components depending on changes of PT-factors have been founded. The method facial discrimination of rocks due to linear relation Al(Si) parameters of the amphiboles have been developed. Crystal structure factor preservation under radiation applied has been clarified. The evolution character of the composition changes of the rock-forming and accessory minerals from Pre-Cambrian rocks of the Ukrainian Shield have been shown. The dissertation presenrs theorerical generalization of experimental data concerning minerals chemical composition. Such approach develops one of the important scientific issue of evolution mineralogy. The results of the research can be used by research organizations for the determination of fundamental laws describing changes in mineralforming medium and industrial enterprises for forcasting metalogenic seahs.