Evaluating abiotic and microbial factors on carbonate precipitation in Lake Acigöl, a hypersaline lake in Southwestern Turkey

Balcı, Nurgül; Demirel‐Floyd, Cansu; Ön, Sena Akçer; Gültekin, Ali Haydar; Kurt, Mehmet Ali

doi:10.1016/j.quaint.2017.12.046

Cited by 23 publications

(7 citation statements)

References 43 publications

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“…Figure 9 illustrates the relationships between dissolved inorganic carbon (DIC) concentration and Mg/Ca molar ratio for Setovskiye Lakes and other lacustrine environments of the world, where authigenic Mg-rich carbonates were also reported. The biplot shows that the DIC values in Trans-Urals forest-steppe reservoirs are significantly lower than in lakes and hydromagnesite-magnesite playas of the Cariboo Plateau, British Columbia, Canada [35,65], and similar or even a bit higher than for water bodies of the Turkish Lakes Region [66,67] and the alkaline lake Eras from Spain [68]. At the same time, the Mg/Ca molar ratios of Vtoroe Zasechnoe was rather high, especially in comparison to the Turkish Lakes and the Slime Lake of British Columbia.…”

Section: Discussionmentioning

confidence: 92%

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

et al. 2019

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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.

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Section: Discussionmentioning

confidence: 92%

“…Biplot illustrating relationships between dissolved inorganic carbon (DIC) and Mg/Ca molar ratio for studied lakes, as well as other continental water bodies, where Mg-carbonates are formed under modern conditions collected from the published research works[35,[65][66][67][68].…”

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confidence: 99%

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

et al. 2019

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“…It has been reported that NH 3 and CA released by microbial metabolism will create alkaline conditions for the precipitation of carbonate minerals ( Zhuang et al, 2018 ; Guo et al, 2021 ). The EPS containing different kinds of VOC in this study are negatively charged in these alkaline conditions, facilitating the adsorption of Ca 2+ and Mg 2+ ions which could promote the crystal nucleation ( Dong et al, 2000 ; Braissant et al, 2007 ; Wacey et al, 2007 ; Deng et al, 2010 ; Balci et al, 2018 ; Picard et al, 2018 ). The nucleation sites of bacteria Y 1 were clearly the EPS ( Figure 5A ).…”

Section: Discussionmentioning

confidence: 98%

The incorporation of Mg2+ ions into aragonite during biomineralization: Implications for the dolomitization of aragonite

et al. 2023

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Bacteria can facilitate the increase of Mg2+ content in biotic aragonite, but the molecular mechanisms of the incorporation of Mg2+ ion into aragonite facilitated by bacteria are still unclear and the dolomitization of aragonite grains is rarely reported. In our laboratory experiments, the content of Mg2+ ions in biotic aragonite is higher than that in inorganically-precipitated aragonite and we hypothesize that the higher Mg content may enhance the subsequent dolomitization of aragonite. In this study, biotic aragonite was induced by Bacillus licheniformis Y1 at different Mg/Ca molar ratios. XRD data show that only aragonite was precipitated in the media with Mg/Ca molar ratios at 6, 9, and 12 after culturing for 25 days. The EDS and atomic absorption results show that the content of Mg2+ ions in biotic aragonite increased with rising Mg/Ca molar ratios. In addition, our analyses show that the EPS from the bacteria and the organics extracted from the interior of the biotic aragonite contain the same biomolecules, including Ala, Gly, Glu and hexadecanoic acid. The content of Mg2+ ions in the aragonite precipitates mediated by biomolecules is significantly higher than that in inorganically-precipitated aragonite. Additionally, compared with Ala and Gly, the increase of the Mg2+ ions content in aragonite promoted by Glu and hexadecanoic acid is more significant. The DFT (density functional theory) calculations reveal that the energy needed for Mg2+ ion incorporation into aragonite mediated by Glu, hexadecanoic acid, Gly and Ala increased gradually, but was lower than that without acidic biomolecules. The experiments also show that the Mg2+ ion content in the aragonite significantly increased with the increasing concentration of biomolecules. In a medium with high Mg2+ concentration and with bacteria, after 2 months, micron-sized dolomite rhombs were precipitated on the surfaces of the aragonite particles. This study may provide new insights into the important role played by biomolecules in the incorporation of the Mg2+ ions into aragonite. Moreover, these experiments may contribute towards our understanding of the dolomitization of aragonite in the presence of bacteria.

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“…Different from open freshwater lakes that mainly deposit organic carbon, inorganic carbon burial contributed approximately 50% to the total carbon burial in Lake Qinghai (Figure 5). Because of the supersaturation of carbonate minerals in water bodies, inorganically precipitated carbonate generally exists in brackish and saline lakes (Einsele et al, 2001;Lammers and Depaolo, 2010;Balci et al, 2018). The semi-enclosed status and high salinity condition in Lake Qinghai lead to a mass of carbonate precipitation and sequestration, resulting in a large IC burial proportion.…”

Section: Total C Burial Estimation In Lake Qinghai Surficial Sedimentsmentioning

confidence: 99%

Spatial Patterns of Organic and Inorganic Carbon in Lake Qinghai Surficial Sediments and Carbon Burial Estimation

et al. 2021

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Lake carbon burial is of vital significance in global carbon cycle and carbon budget, particularly in the large deepwater lakes. However, carbon burial in large deepwater lakes is hard to estimate due to the difficulty in obtaining high spatial-resolution samples. In this study, we investigated distributions of total organic carbon (TOC) and inorganic carbon (TIC), two main carbon components in lake sediments, based on dozens of surficial sedimentary samples (n = 26) covering whole Lake Qinghai, the largest saline lake in China. The results showed that the TOC content, with a range of 1.4–4.8%, was significantly higher in the lake area near the northern lakeshore where human activities are concentrated and lower in the lake areas near the Buha River mouth and the eastern lake area. In contrast, the TIC content, ranging from 1.5 to 3.8%, increased from the northwestern and southeastern lake areas toward the lake center, and mainly depended on hydro-chemical and hydraulic characteristics. The inorganic carbon burial (47.77 ± 19.73 Gg C yr−1) was approximately equal to organic carbon burial (47.50 ± 22.68 Gg C yr−1) and accounted for about 50% of the total carbon burial (95.27 ± 37.74 Gg C yr−1), suggesting that saline lakes constitute a large inorganic carbon pool in addition to an organic carbon pool. Because of saline water body type in arid and semiarid regions and alpine Qinghai–Tibet Plateau, lakes in these regions have huge inorganic carbon burial potential and important contributions to the global carbon budget.

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Evaluating abiotic and microbial factors on carbonate precipitation in Lake Acigöl, a hypersaline lake in Southwestern Turkey

Cited by 23 publications

References 43 publications

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

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

The incorporation of Mg2+ ions into aragonite during biomineralization: Implications for the dolomitization of aragonite

Spatial Patterns of Organic and Inorganic Carbon in Lake Qinghai Surficial Sediments and Carbon Burial Estimation

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