HIGH-ALUMINA INDUSTRIAL MINERAL DISTRIBUTION IN THE COMPLEX ORES OF VYSOTA OCCURRENCE

Rock complexes, containing various types of non-metallic raw materials in the Vysota occurrence area, consists of gneiss, metasomatic rocks, bimineral quartzite and anchimonomineralic rocks. This situation is primarily due to vigorous metasomatic processes that substantially affected all the metamorphic complexes of the area. Rocks, metamorphosed under high-pressure kyanite-facies conditions, are represented by garnet and garnet-free amphibolites, metaandesite and amphibole and garnet-biotite gneisses. Synmetamorphic metasomatic processes are represented by extensive acid leaching and local basic and Fe-Mg metasomatism. Synmetamorphic tectonic processes, dominantly rock foliation and schistosity, mylonitization and the formation of systems of fractures, are also widespread in the occurrence area. Garnet, forming in metasomatic rocks after originally garnet-free metaandesites, should also be mentioned. It commonly occurs as idiomorphic well-facetted crystals, up to 15 mm in size, which contain small quantities of quartz inclusions. In addition, garnet formed in metasomatic rocks after metaandesites contains much less Fe and much more Ca, as compared to garnet formed in metasomatic rocks after amphibolites. Garnet porphyroblasts with a high percentage of inclusions are present in metamorphic garnet-biotite gneisses. The grains commonly exhibit well-defined boundaries, are isometric and are up to 30 mm in size. The inclusions are distributed in a uniform manner. Garnet grains with the spiral-like or parallel arrangement of inclusions occur. Other industrial minerals are quartz and feldspar, but unaltered garnet-biotite gneisses are scarce in the ore occurrence area. The metasomatic rocks of the rear zones are metasomatic quartzites, almost always garnet quartzites. Anchimonomineralic granatites, understood as local zones of Fe-Mg metasomatism associated with felsic metasomatism, are also noteworthy. Thus, attempts to identify the "technological types" of rocks is part of the study of the area. Such types consist of several mineral, similar in technological properties, in which industrial mineral concentrations predominate. In the present paper the authors use the concept of a metamorphogenetic-metasomatic complex which displays a certain mineral concentration range, chemism and a particular stage of formation, depending on a metamorphic stage and a metamorphic protolith. The industrial minerals of these complexes differ in structural, chemical and morphological parameters.