Water regime and variations in hydrochemical characteristics of the soda Salt Lake Khilganta (Southeastern Transbaikalia) |
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| Authors: | Z B Namsaraev V M Gorlenko S P Buryukhaev D D Barkhutova V D Dambaev L E Dulov V V Sorokin B B Namsaraev |
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| Institution: | 1.Institute of Microbiology,Russian Academy of Sciences,Moscow,Russia;2.Institute of General and Experimental Biology, Siberian Branch,Russian Academy of Sciences,Ulan-Ude,Russia;3.Buryat State University,Ulan-Ude,Russia |
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| Abstract: | Hydrochemical and biogeochemical processes in Lake Khilganta were studied during more than ten years. The lake was shown to
pass through periods of wetting and drying. This is accompanied by considerable changes in water chemistry and microbiological
processes. During the passage from a wet to a dry period, lake water mineralization increases from 40 to 260 g/l and pH decreases
from 9.9 to 7.1. At the same time, the isotope composition of organic matter carbon in bottom deposits becomes lighter (from
−15.6 to −30.6‰), as well as that of carbon in carbonates (from +4.1 to −8.6‰), due to the lower rate of photosynthetic processes
in lake bacterial mats. The order of salt precipitation during the passage from a wet to a dry period and the mechanism of
maintaining water pH are considered. A possible similarity between the modern processes in Lake Khilganta and the processes
in analogous Pre-Cambrian water bodies is discussed, and the hypothesis regarding the possibility of wider development of
soda water bodies at early stages of Earth’s history is considered. |
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