Title

N.YU. NIKULOVA (IG Komi SC UB RAS)

Lythological and chemical composition and depositional conditions of metasediment basement rocks of the Vadyavog prominence (Nem upland, South Timan)

The results of studying of the Upper Riphean metaclastic rock composition from the Nem upland of South Timan are presented in the article. Lithological and geochemical investigation of the rocks gave the opportunity to establish that these rocks were formed at the coastal-­marine conditions of cold well-­aerated basin with weak hydrodynamic regime. The tectonic conditions were calm and volcanic activity was absent at that time. It was found that recycled clastic fragments that redeposited from ancient sedimentary rock material and fragments of weakly altered granite are presented in the rocks in different ratios.

Keywords: metasandstone, aleurolite, shale, clastic material formation, chemical composition.