TWO GENETIC TYPES OF SERICITOLITES IN THE NEAR-POLAR URALS

Abstract

Sericitolites are metamorphic and vein rocks that contain more than 50% sericite (a less common variety of muscovite). Therefore, these rocks are enriched in K (≥5% K2O). We studied them in the following regions of the near-Polar Urals: the Maldynyrd Ridge (left bank of the Balban’’yu River, the large left tributary of the Kozhim River), the Chernaya Gora Ridge sometimes outlined as the southern spur of the Rosomakha Ridge (left bank of the Kozhim River), and the Zhelannoe deposit (the largest vein quartz and rock crystal deposit in Europe). Although these regions are spaced at no more than 3 km along the Balban’’yu River valley, we can recognize here two discrete (stratiform and vein) morphological types of sericitolite.