Typomorphic features of garnets from the middle neopleistocene tills in the north and south of Timan-Pechora-Vychegda region

The article presents results of research of typomorphic features of garnets from the Middle Neopleistocene tills in the valleys of Laya and Vychegda Rivers due to necessity of valid and reliable subdivision and correlation of the deposits. Two sorts of garnets, different in color, are the most widespread - orange and pink. The pink garnets dominate in the valley of the Laya River, their content in the Pechora horizon is higher than in the Vychegda horizon. In the Vychegda River valley the tills are enriched with orange garnets, but their concentration is higher in the Vychegda till. Pyrope-almandine prevails among the pink garnets in the Pechora till. In the valley of the Laya River it accounts for 90 %, in the Vychegda River - 60 %. Half of grains among orange garnets in the Vychegda till of the Laya River are pyrope-almandine-grossularite and grossularite-pyrope-almandine, but in the valley of the Vychegda River they make up 100 %. The portion of pyrope-almandine among pink garnets in the Laya River valley is 56 %, in the Vychegda River valley - 44 %. Single garnet grains with high content of calcium (up to 90 %) and spessartine minal (more than 50 %) are found in the Vychegda till in the valley of the Laya River.