Peculiarities of mineralization of the Potamogeton'aceae family of the river Vym (Komi Republic)

The characteristics of the structure and composition of biomineral crusts on macrophytes living in the cold freshwater system SO4-HCO3 Ca of the Vym River are given. The objects of the study are neogenic microminerals deposited on macrophytes of the Potamogetonάceae family: P. fennicus Hagstr., P. angustifolius J. Presl, P. vepsicusA.A. Bobrov et Chemeris and P. gramineus L. living in the area of distribution of Permian sulfate-carbonate-terrigenous rocks. It is shown that the chemical composition of phytoliths reflects the processes of carbonate precipitation. CaO content in the carbonate precipitate on the surfaces of the macrophytes is 68-92 wt. %. Calcite, which is the main mineral component of biomineral crusts, forms the shapeless aggregates, crystalline druses, single monocrystals and bizarre shapes (rosettes, spherulites, etc.). A rare mineral, calciolangbeinite, was discovered. The study of mineralized macrophytes of the Potamogetonάceae family growing in the Vym River shows the complexity and variety of the relationships between the organic and mineral components in the macrophyte-water-rock system, and the possibility of presentday freshwater continental carbonate sedimentation.