Characteristics of the meta sandstones of the Svetlinskaya suite, a substrate of alkaline ore metasomatites (Oktyabrskoe ore field, Middle Timan)

The paper considers the characteristics of the meta sandstones of the Svetlinskaya Suite developed within the Oktyabrskoe ore field at the Chetlas Stone (Middle Timan) and serving as a substrate for ore alkaline metasomatites. The main source of detrital material for fine-grained feldspar-quartz metasandstones during their formation were the meta-sedimentary and, to a lesser extent, acidic igneous rocks, including those altered in the weathering crust. The formation of metapsammites took place under relatively stable tectonic conditions of the passive continental margin.