Strontium and 87Sr/86Sr isotopic ratio of ground brines in the northeastern Angara-Lena artesian basin
https://doi.org/10.21285/2686-9993-2021-44-2-98-105
Abstract
The purpose of this study is to identify the major formation processes of the ionic and isotopic composition of chloride brines in the sedimentary basins of the Siberian platform. The object and subject of research are deep-seated strong, very strong and extremely saturated brines as well as their strontium content and the ratio of Sr stable isotopes. The groundwater ionic-salt composition was determined by traditional methods (titrimetric, gravimetric, flame photometry), the 87Sr/86Sr isotopic ratio was measured using mass-spectrometers (Irkutsk, Russia and Canada). The brines lying at the depth of 1500–3000 m were tapped and classified into saline and subsalt hydrogeological formations. Their feature is high salinity (385–530 g/L) and high content of strontium (2.3–7 g/L). The 87Sr/86Sr isotopic ratio ranges from 0.708 to 0.713062. By isotopic composition most of the brine samples are close to the waters of the Vendian-Cambrian paleoocean. However, some brine samples from the subsalt part of the sedimentary section of the basin are significantly enriched in the isotope 87Sr compared to the paleoocean waters and other samples. It could be due to the substantial input of 87Sr into the brines during the long-term interaction of groundwater with the host Lower Cambrian sandstones.
Keywords
Supporting agencies: The authors acknowledge a gratitude to Dr. Sci. (Geol. & Mineral.) Andrey G. Vakhromeev and Evgeniy O. Chertovskikh for the provided samples of brines.
About the Authors
L. P. Alekseeva
Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences; Irkutsk State University
Russian Federation
Competing Interests:
Russian Federation
Lyudmila P. Alekseeva, Dr. Sci. (Geol. & Mineral.), Leading Researcher of the Laboratory of Hydrogeology, Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences
128 Lermontov St., Irkutsk 664033
Competing Interests:
The authors declare no conflicts of interests.
S. V. Alekseev
Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Competing Interests:
Russian Federation
Sergey V. Alekseev, Dr. Sci. (Geol. & Mineral.), Head of the Laboratory of Hydrogeology
128 Lermontov St., Irkutsk 664033
Competing Interests:
The authors declare no conflicts of interests.
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Review
For citations:
Alekseeva L.P., Alekseev S.V. Strontium and 87Sr/86Sr isotopic ratio of ground brines in the northeastern Angara-Lena artesian basin. Earth sciences and subsoil use. 2021;44(2):98-105. (In Russ.) https://doi.org/10.21285/2686-9993-2021-44-2-98-105
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