Geochemistry of calcite-precipitating waters of the European Northeast

Tatiana P Mityusheva,O Chudaev,O Shouakar-Stash,R Millot,Y Kharaka,R Harmon

doi:10.1051/e3sconf/20199807018

Abstract

The geochemistry of natural calcite-precipitating waters of the European northeast was presented in this paper. The chemical composition and main hydro-chemical type of these surface and underground waters are various, TDS from 239 to 2090 mg/L. The waters are supersaturated with respect to calcite, there are favorable hydrochemical conditions for formation recent continental carbonates (calcareous tufa, charophyta, calcareous crusts on macrophytes) in the conditions of moderate continental climate.

Highlights

The study of interactions in the water-carbonates system is relevant because of a wide distribution, diversity and complexity of calcite-precipitating biogeosystems formed in continental conditions.Data about the chemical composition of the waters are presented in the numerous works characterizing paleo- and recent carbonates from various regions of the world
The area of study is in high widths within 60o30'–67o20' N and 45o00'–61o00' E in the northeast of the East European platform, far from warm Atlantic and close to Arctic ocean, which result in moderate continental climate with low temperature and a significant amount of atmospheric precipitations (600-800 mm per year), exceeding evaporation
A similar picture is observed in the Vaskin klyuch spring (42/09→40-2/09): when falling from a height with increasing temperature and alkalinity of water, there is a sharp decrease in the amount of carbon dioxide, total dissolved solids (TDS), components CaCO3

Summary

Introduction

The study of interactions in the water-carbonates system is relevant because of a wide distribution, diversity and complexity of calcite-precipitating biogeosystems formed in continental conditions. Data about the chemical composition of the waters are presented in the numerous works characterizing paleo- and recent carbonates from various regions of the world. The main purpose of this paper is to characterize the chemical features of calciteprecipitating surface and underground waters of the European northeast. The area of study is in high widths within 60o30'–67o20' N and 45o00'–61o00' E in the northeast of the East European platform, far from warm Atlantic and close to Arctic ocean, which result in moderate continental climate with low temperature (mid-annual temperature -1...-5oC) and a significant amount of atmospheric precipitations (600-800 mm per year), exceeding evaporation. The territories, where areas with recent carbonate sedimentation were investigated, were composed of carbonaceous Upper Devonian, sulphate-carbonate-terrigenous and carbonateterrigenous Permian and terrigenous Middle to Upper Jurassic deposits

Sampling and analysis

Conclusions