Brine evolution in two inland evaporative environments: influence of microbial mats in mineral precipitation

Cabestrero, Óscar; Sanz‐Montero, M. Esther

doi:10.1007/s10933-016-9908-0

Cited by 26 publications

(34 citation statements)

References 29 publications

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“…As with dolomite [CaMg(CO 3 ) 2 ], the abiotic precipitation of magnesite at low temperatures is kinetically inhibited (Vasconcelos et al, 1995; Vasconcelos and McKenzie, 1997; Sánchez-Román et al, 2009a, 2011a)as a consequence of the strong hydration of the Mg 2+ ions (Slaughter and Hill, 1991). In contrast, the hydrated Mg-carbonate phases are often found associated with microbial mats in contemporary saline systems (Renaut, 1993; Braithwaite and Zedef, 1996; Coshell et al, 1998; Edwards et al, 2006; Power et al, 2007, 2009, 2017; Cabestrero and Sanz-Montero, 2018). Along this line, experimental investigations that examined mineral precipitation using microorganisms isolated from natural lakes (Thompson and Ferris, 1990; Power et al, 2007; Shirokova et al, 2013), have suggested the importance of cyanobacteria in promoting the formation of hydrated Mg-carbonates.…”

Section: Introductionmentioning

confidence: 99%

“…Lake Las Eras, in Central Spain, is an evaporitic highly alkaline inland lake where hydromagnesite and dolomite, among other carbonates, are precipitating (Sanz-Montero E. et al, 2013; Cabestrero and Sanz-Montero, 2018; Cabestrero et al, 2018). The lake is one of the few modern environments where hydromagnesite is a dominant precipitating mineral at the microbialite surfaces in association with dolomite.…”

Section: Introductionmentioning

confidence: 99%

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Microbial Mg-rich Carbonates in an Extreme Alkaline Lake (Las Eras, Central Spain)

2019

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This paper provides strong evidence for the contribution of the phylum Firmicutes in mediating the primary precipitation of Mg-rich carbonates (hydromagnesite, dolomite, magnesite, and nesquehonite) in recent microbialites from a highly alkaline and ephemeral inland lake (Las Eras, Central Spain). The carbonate mineral precipitation occurs sequentially as the microbial mats decay. Scanning electron microscopy (SEM) provided solid proof that hydromagnesite nucleation is initiated on the exopolymeric substances (EPS) and the microbial cells associated to the microbial mat degradation areas. The progressive mineralization of the EPS and bacterial cells by hydromagnesite plate-like crystals on their surface, results in the entombment of the bacteria and formation of radiating aggregates of hydromagnesite crystals. The hydrous phases, mostly hydromagnesite, were produced at a high percentage in the first stages of the microbial degradation of organic matter. When the availability of organic substrates declines, the heterotrophs tend to reduce their number and metabolic activity, remain dormant. At this stage, the anhydrous phases, dolomite and magnesite, nucleate on bacterial nanoglobules and/or collapsed cells. Evidence for the sequential formation of the Mg-rich carbonates trough the decay of organic matter by a fermentative EPS-forming bacterium isolated from the microbialites, Desemzia incerta, is drawn through a comparative analysis of carbonate formation in both natural and experimental settings. This study will help to constrain potential mechanisms of carbonate formation in natural systems, which are of fundamental importance not only for understanding modern environments but also as a window into the geologic past of Earth and potentially Mars.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microbial Mg-rich Carbonates in an Extreme Alkaline Lake (Las Eras, Central Spain)

2019

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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: 97%

“…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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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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“…Regardless of the ionic composition, saline lakes that support a thin veneer of microbial mats can modify the chemical behavior of evaporitic sediment and promote the formation of carbonates and sulfates from Ca-poor waters with high Mg/Ca ratios (Cabestrero and Sanz-Montero 2017). The authors studied six lakes in two evaporitic endorheic drainage systems in central Spain.…”

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confidence: 99%

International Limnogeology Congress (ILIC6), Reno USA, special issue on new limnogeological research focused on Holocene lake systems

Starratt

Rosen

2017

J Paleolimnol

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The successful congress brought together a wide variety of academic, government, and industry participants from 20 countries and six continents. The highpoint of the four-day meeting were eight keynote addresses highlighting cutting-edge research in paleolimnology and limnogeology. These addresses were often the focal point of discussions throughout the congress. Among the topics covered in the more than 140 poster presentations included the use of biological proxies to identify paleoenvironmental change due to natural variability and human impact, the evolution of mineral formation in saline lakes, sedimentation deposition processes in Mesoproterozoic lakes, the role of groundwater in lacustrine hydrology, and organic and inorganic contaminant histories in modern lakes. The abstract volume and field trip guide for the meeting is available at and , respectively.

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Brine evolution in two inland evaporative environments: influence of microbial mats in mineral precipitation

Cited by 26 publications

References 29 publications

Microbial Mg-rich Carbonates in an Extreme Alkaline Lake (Las Eras, Central Spain)

Microbial Mg-rich Carbonates in an Extreme Alkaline Lake (Las Eras, Central Spain)

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

International Limnogeology Congress (ILIC6), Reno USA, special issue on new limnogeological research focused on Holocene lake systems

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