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

Frontiers in Microbiology
M Esther Sanz-MonteroMónica Sánchez-Román

Abstract

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 seq...Continue Reading

References

Feb 24, 1999·International Journal of Systematic Bacteriology·E StackebrandtN Weiss
Dec 23, 2004·Systematic and Applied Microbiology·Spyridon NtougiasKalliope K Papadopoulou
Mar 22, 2006·BMC Genomics·Robert A EdwardsForest Rohwer
May 31, 2007·FEMS Microbiology Ecology·Mónica Sánchez-RománJudith A McKenzie
Apr 24, 2014·Scientific Reports·Mónica Sánchez-RománCrisogono Vasconcelos
Nov 6, 2014·World Journal of Microbiology & Biotechnology·Ajar Nath YadavAnil K Saxena
Oct 7, 2015·Frontiers in Microbiology·Mónica Sánchez-RománRicardo Amils

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Citations

Aug 24, 2021·Journal of Geophysical Research. Planets·Eva L SchellerBen P Smith

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Methods Mentioned

BETA
X-ray

Software Mentioned

PHREEQC
EVA Bruker

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