Nature of Inner Asia
Bibliographic description:
, ISOTOPIC VARIATIONS OF ORGANIC CARBON AND CARBONATES IN BOTTOM SEDIMENTS AND MICROBIAL MATES OF MINERAL LAKES IN ZABAIKALSKY KRAI // Nature of Inner Asia. - 2023. №3(25). . - С. 40-48.
Title:
ISOTOPIC VARIATIONS OF ORGANIC CARBON AND CARBONATES IN BOTTOM SEDIMENTS AND MICROBIAL MATES OF MINERAL LAKES IN ZABAIKALSKY KRAI
Financing:
Работа выполнена за счет средств государственного задания (№ 121030100229-1)
Codes:
Annotation:
We have studied isotope variations of organic carbon and carbonates in bottom
org
sediments and microbial mats of mineral lakes of Zabaikalsky Krai. Organic carbon (d13C )
in bottom sediments of the studied mineral lakes ranges from -22.28 to -30.12 ‰, carbonates
(d13C
) — from -5.60 to -12.15 ‰. A wide range of variations in d13C
indicates that bottom
carb
org
sediments of mineral lakes inherit the isotopic composition of the primary producers of
organic substance. In production processes, microorganisms of mineral lake mats use carbon dioxide, which differs in the carbon isotopic composition. Cyanobacteria in the microbial mats of mineral lakes use carbon dioxide of biogenic origin to synthesize organic substance. High pH values in combination with high concentrations of salts up to saturating levels make mineral lakes unique ecosystems. The arid climate and high solar activity favor the evaporation of water and formation of highly mineralized lakes.
A specific feature of these lakes is alkaline conditions and high concentration of salts [Syrenzhapova, Abidueva, Dagurova et al., 2023]. There are more than 100 large and small lakes in Zabaikalsky Krai, among which mineral lakes are often found. They are mainly located in flat basins, have a predominantly round or oval shape, the water level depends on
the amount of precipitation. Some of them dry out during dry times.
The article is aimed at studying isotope variations of organic carbon and carbonates in bottom sediments and microbial mats of mineral lakes of Zabaikalsky Krai.
org
sediments and microbial mats of mineral lakes of Zabaikalsky Krai. Organic carbon (d13C )
in bottom sediments of the studied mineral lakes ranges from -22.28 to -30.12 ‰, carbonates
(d13C
) — from -5.60 to -12.15 ‰. A wide range of variations in d13C
indicates that bottom
carb
org
sediments of mineral lakes inherit the isotopic composition of the primary producers of
organic substance. In production processes, microorganisms of mineral lake mats use carbon dioxide, which differs in the carbon isotopic composition. Cyanobacteria in the microbial mats of mineral lakes use carbon dioxide of biogenic origin to synthesize organic substance. High pH values in combination with high concentrations of salts up to saturating levels make mineral lakes unique ecosystems. The arid climate and high solar activity favor the evaporation of water and formation of highly mineralized lakes.
A specific feature of these lakes is alkaline conditions and high concentration of salts [Syrenzhapova, Abidueva, Dagurova et al., 2023]. There are more than 100 large and small lakes in Zabaikalsky Krai, among which mineral lakes are often found. They are mainly located in flat basins, have a predominantly round or oval shape, the water level depends on
the amount of precipitation. Some of them dry out during dry times.
The article is aimed at studying isotope variations of organic carbon and carbonates in bottom sediments and microbial mats of mineral lakes of Zabaikalsky Krai.
Keywords:
Zabaikalsky Krai, carbon isotope composition δ13С, organic matter, bottom sediments, microbial mats, microbial destruction, mineral lakes, sampling.
List of references:
Article.pdf