TY - JOUR

T1 - Water–Rock–Organic Matter Interactions in Wetland Ecosystem: Hydrogeochemical Investigation and Computer Modeling

AU - Shvartseva, Olga

AU - Gaskova, Olga

AU - Yurtaev, Andrey

AU - Boguslavsky, Anatoly

AU - Kolpakova, Marina

AU - Mashkova, Daria

N1 - The fieldwork was funded by the academic leadership program of the University of Tyumen (strategic academic leadership program “Priority-2030”) and the West-Siberian Interregional Science and Education Center’s project No. 89-DON. Experimental work and analysis of peat and water samples were funded by the state assignment of IGM SB RAS (No. 122041400237-8). The physical–chemical modeling was performed within the state assignment in science for scientific projects carried out by teams of youth laboratories of educational institutions of higher education subordinated to the Ministry of Education and Science of Russia under the project “Development of a system for monitoring, assessing and predicting the complex state of the components of the ‘water-rock-gas-organic matter’ system during the exploitation of hydrocarbon fields” (FEWN-2023-0011, 2023–2024).

PY - 2024/2/19

Y1 - 2024/2/19

N2 - This work investigates how peatlands can be used as archives of past environmental conditions to record changes in atmospheric deposition of some (especially lithophile and chalcophile) elements and any water–rock–organic matter interactions followed by the sedimentation or leaching of others. We have provided a detailed description of both the distribution of various groups of elements and their chemical species in the entire depth of peat deposits. The study analyzes the features of the peat sediment formation and element distribution in the 0–310 cm depth core sample of peat deposits of the Ubinskoye peat bog located in the forest-steppe zone of Western Siberia. The study reveals a profound diagenetic transformation of water and peat chemical composition. Element speciation investigated using the modified Tessier sequential extraction procedure showed the vertical transition of an oxidative geochemical environment to a reducing one with the formation of geochemical barriers for variably valent elements. Computer modeling calculations of saturation indices of pore solutions in relation to a number of minerals allowed us to estimate the degree of equilibrium of the system and the direction of its transformation. Early diagenetic processes lead to the deposition of authigenic minerals. Therefore, barite forms on the redox line, while pyrite is found in the reducing environment. With depth, the content of Ca, Mg and Sr increases, which leads to the formation of authigenic carbonates.

AB - This work investigates how peatlands can be used as archives of past environmental conditions to record changes in atmospheric deposition of some (especially lithophile and chalcophile) elements and any water–rock–organic matter interactions followed by the sedimentation or leaching of others. We have provided a detailed description of both the distribution of various groups of elements and their chemical species in the entire depth of peat deposits. The study analyzes the features of the peat sediment formation and element distribution in the 0–310 cm depth core sample of peat deposits of the Ubinskoye peat bog located in the forest-steppe zone of Western Siberia. The study reveals a profound diagenetic transformation of water and peat chemical composition. Element speciation investigated using the modified Tessier sequential extraction procedure showed the vertical transition of an oxidative geochemical environment to a reducing one with the formation of geochemical barriers for variably valent elements. Computer modeling calculations of saturation indices of pore solutions in relation to a number of minerals allowed us to estimate the degree of equilibrium of the system and the direction of its transformation. Early diagenetic processes lead to the deposition of authigenic minerals. Therefore, barite forms on the redox line, while pyrite is found in the reducing environment. With depth, the content of Ca, Mg and Sr increases, which leads to the formation of authigenic carbonates.

KW - authigenic mineral formation

KW - diagenesis

KW - element distribution

KW - geochemical profile

KW - peat deposits

KW - water–rock–organic matter interaction

UR - https://www.webofscience.com/wos/woscc/full-record/WOS:001160068500001

UR - https://www.mendeley.com/catalogue/4b148813-2408-36ce-9934-9aaeef60a95b/

U2 - 10.3390/w16030428

DO - 10.3390/w16030428

M3 - Article

VL - 16

JO - Water (Switzerland)

JF - Water (Switzerland)

SN - 2073-4441

IS - 3

M1 - 428

ER -