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Open AccessFeature PaperArticle

Mg-Rich Authigenic Carbonates in Coastal Facies of the Vtoroe Zasechnoe Lake (Southwest Siberia): First Assessment and Possible Mechanisms of Formation

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Institute of Earth Sciences, University of Tyumen, Tyumen 625002, Russia
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Center of Advanced Research and Innovation, Tyumen Industrial University, Tyumen 625000, Russia
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BIO-GEO-CLIM Laboratory, National Research Tomsk State University, Tomsk 634050, Russia
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Institute of Applied Geosciences, Graz University of Technology, Graz 8010, Austria
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Tomsk Oil and Gas Research and Design Institute (TomskNIPIneft), Tomsk 634027, Russia
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Géosciences Environnement Toulouse (GET), CNRS, UMR 5563, 31400 Toulouse, France
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N.P. Laverov Federal Center for Integrated Arctic Research (FCIArctic), Russian Academy of Sciences, Arkhangelsk 163000, Russia
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Author to whom correspondence should be addressed.
Minerals 2019, 9(12), 763; https://doi.org/10.3390/min9120763
Received: 12 October 2019 / Revised: 6 December 2019 / Accepted: 8 December 2019 / Published: 9 December 2019
(This article belongs to the Special Issue Microorganisms–Minerals Interactions in Aquatic Environments)
The formation of Mg-rich carbonates in continental lakes throughout the world is highly relevant to irreversible CO2 sequestration and the reconstruction of paleo-sedimentary environments. Here, preliminary results on Mg-rich carbonate formation at the coastal zone of Lake Vtoroe Zasechnoe, representing the Setovskiye group of water bodies located in the forest-steppe zone of Southwest Western Siberia, are reported. The Setovskiye lakes are Cl–Na+–(SO42−) type, alkaline, and medium or highly saline. The results of microscopic and mineralogical studies of microbialites from shallow coastal waters of Lake Vtoroe Zasechnoe demonstrated that Mg in the studied lake was precipitated in the form of hydrous Mg carbonates, which occur as radially divergent crystals that form clusters in a dumbbell or star shape. It is possible that hydrous Mg carbonate forms due to the mineralization of exopolymeric substances (EPS) around bacterial cells within the algal mats. Therefore, the Vtoroe Zasechnoe Lake represents a rare case of Mg-carbonates formation under contemporary lacustrine conditions. Further research on this, as well as other lakes of Setovskiye group, is needed for a better understanding of the possible role of biomineralization and abiotic mechanisms, such as winter freezing and solute concentration, in the formation of authigenic Mg carbonate in modern aquatic environments. View Full-Text
Keywords: Western Siberia; Mg carbonates; Mg-Ca carbonates; hydromagnesite; lakes; biomineralization Western Siberia; Mg carbonates; Mg-Ca carbonates; hydromagnesite; lakes; biomineralization
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Novoselov, A.A.; Konstantinov, A.O.; Lim, A.G.; Goetschl, K.E.; Loiko, S.V.; Mavromatis, V.; Pokrovsky, O.S. Mg-Rich Authigenic Carbonates in Coastal Facies of the Vtoroe Zasechnoe Lake (Southwest Siberia): First Assessment and Possible Mechanisms of Formation. Minerals 2019, 9, 763.

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