Underwater Discharge of Fluids at the Bottom of Lake Baikal: Composition, Sources, and Migration Peculiarities within the MSU Structure

Pogodaeva, T.V.; Akhmanov, G.G.; Onishchuk, N.A.; Shubenkova, O.V.; Khabuev, A.V.; Khlystov, O.M.

Авторы: Pogodaeva T.V., Akhmanov G.G., Onishchuk N.A., Shubenkova O.V., Khabuev A.V., Khlystov O.M.
Журнал: Geochemistry International
Том: 62
Номер: 8
Год издания: 2024
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 864
Последняя страница: 877
DOI: 10.1134/s0016702924700447
Аннотация: The paper presents geochemical study of bottom sediments from the MSU structure located on thelarge Gydratny Fault in the Central Basin of Lake Baikal at a depth of 1380 m. The first detailed data on the spatial variations in the qualitative and quantitative composition of the pore waters are presented. Pioneering data were obtained on Li, B, and Sr contents in the pore water of the sediments. It has been established that fluids are actively discharged within the MSU structure, and the main pathways of their near-surface migration are confined to the tops of hills of this structure on the downthrown fault block. The fluids are highlymineralized (up to 2900 mg/L), showing the highest mineralization ever found in Lake Baikal sediments. The waters are significantly enriched in Mg, Li, B, and Sr but depleted in K. The waters are thought to be generated by the processes of authigenic formation and illitization of smectite at depths of 1 to 2.5 km in the sedimentary sequence. The maximum values of concentration gradients are recorded in the pore waters of the sediments of the western hill, which may indicate a gradual westward shift of the center of the fluid seepageactivity along the fault.
Добавил в систему: Ахманов Григорий Георгиевич

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Underwater Discharge of Fluids at the Bottom of Lake Baikal: Composition, Sources, and Migration Peculiarities within the MSU Structureстатья

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