GEOCHEMICAL CONDITIONS OF SULLAR SPRING: FORMATION OF AUTHIGENIC MINERALS AND METHANE FLUXES

• Published in: Bulletin of the Tomsk Polytechnic University Geo Assets Engineering
• Main Authors: Evgeniya A. Soldatova, Evgeniya S. Sidkina, Bogdan A. Kiriukhin, Prokopiy N. Maximov, Liudmila A. Krivenok, Vladimir Ivanov, Nikita I. Tananaev
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: Tomsk Polytechnic University 2023
• Subjects: Interpermafrost groundwater; carbon cycle; iron cycle; greenhouse gases; secondary minerals; microbial abundance; Engineering geology. Rock mechanics. Soil mechanics. Underground construction; TA703-712; Rus’; Ice; lena river; permafrost; Yakutia
• Online Access: https://doi.org/10.18799/24131830/2023/10/4192; https://doaj.org/article/36470178302544bc917f7eb34ee2aa54

Link for citation: Soldatova E.A., Sidkina E.S., Kiriukhin B.A., Maximov P.N., Krivenok L.A., Ivanov V., Tananaev N.I. Geochemical conditions of Sullar spring: formation of authigenic minerals and methane fluxes. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 10, рр. 16-33. In Rus. Relevance and the research object. Interpermafrost aquifers and areas of their discharge with seasonal ice covers are special permafrost-hydrogeological and hydrochemical systems that are not typical for the thick continuous permafrost zone of Central Yakutia. Differences in chlorofluorocarbon content indicate the anaerobic conditions of some springs suggesting microbial degradation of these compounds by methanogenic bacteria. In the discharge area of such springs, a sharp change in the geochemical conditions takes place leading to a transformation in the water chemical composition and boosting the processes of authigenic mineral formation in this buffer area. In current work we considered the geochemical system of the Sullar spring – the most northern and the least studied among interpermafrost groundwater discharge zones of the Lena River right bank. Intensive accumulation of authigenic minerals was found in the Sullar discharge area during field research. It was Fe compounds with bacterial mats as an opalescent film. Some researchers state the connection between the transformation of Fe compounds during permafrost melting and the migration and transformation of organic matter, including its consumption by microorganisms with further methane emission. We assumed that there is a relationship between the authigenic mineral formation and the content and emission of methane in the discharge area of the spring. This research is the first comprehensive description of the hydrochemistry of the interpermafrost water of the Sullar spring. The aim of the research was to explore influence of geochemical conditions and microbial communities on formation of authigenic minerals and methane fluxes, in ...