Mobilization of titanium disseminated in ancient sediments, by reduction to Ti..., in the presence of organic substance and metamorphogenic solutions, and its subsequent accumulation in the form of unstable Ti-organic compounds, followed by decomposition of the organic collector, has led to the growth of titanium porphyroblasts in graphite-micaceous schists of the territory – products of the regional metamorphism of ancient shales. Mineralogical composition of the porphyroblasts represents the degree of the metamorphism (leucoxene → sphene → ilmenite); their size increases at increasing carbonaceous-graphite content of the rock. The widely varied Ti:Nb ratios in the porphyroblasts and in the rocks, together with other considerations, indicate a significant restriction of the mobility of Nb during the titanium-segregating stages of the metamorphism. – IGR Staff.