Abstract
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.
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