Ultrapotassium rocks of lower part of Upper Vorykva basalt cover (Middle Timan)

Determination of the genesis of ultrapotassium rock petrology is an urgent task. At the base of the basalt cover the Middle Timan we first discovered ultrapotassic (K2O - 9-11 wt. %) Alkaline rocks. On the basis of complex geological and petrographic, geochemical data and the study of the chemical composition of minerals, for the first time we provided data on the geology, geochemistry and mineralogy of rocks of the lower part of the basalt cover. The rocks are not metasomatic and formed as a result of potassium metasomatism basalts. The rock were composed of exclusively potassium feldspar embedded in the matrix of potassium same glass. The genesis of magmatic rocks was considered: perhaps it was the first piece of basaltic melt enriched in alkali, from the top of the magma chamber (1); or by the introduction of the zone of contact with the later melt from basalt with more excellent alkaline composition (2); or it was near-contact zone, where the vitrification (firing) ocurent, the potassium source, in this case, perhaps was the underlying bauxite (3).