Proto-dolomite formation in microbial consortia dominated by Halomonas strains

Alibrahim, Ammar; Al-Gharabally, Dunia; Mahmoud, Huda; Dittrich, Maria

doi:10.1007/s00792-019-01135-2

Cited by 10 publications

(3 citation statements)

References 80 publications

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“…The replacement experimentation was based on the diagenetic formation mode of ancient dolomite where Mg substituted Ca in limestone rocks ( Daly, 1907 ; Van Tuyl, 1916 ). Furthermore, the examination of microbial ability to mediate replacement at low temperature (<50°C) was inspired from laboratory experiments that have shown the successful formation of microbial dolomite or one of dolomite’s phases ( Roberts et al, 2004 ; Sánchez-Román et al, 2009 ; Bontognali et al, 2010 , 2014 ; Deng et al, 2010 ; Krause et al, 2012 ; Brauchli et al, 2016 ; Petrash et al, 2017 ; Alibrahim et al, 2019 ). Therefore, we found it reasonable to examine the ability of microbes to replace precursor calcium carbonates, as microbes have potentials toward overcoming the kinetic barrier of dolomite; such replacement experiments have not been previously conducted.…”

Section: Discussionmentioning

confidence: 99%

Examining the Ability of Aerobic Halophilic Heterotrophic Microbial Consortia to Replace Ca by Mg in Different CaCO3 Precursors

Alibrahim

Dittrich

2022

Front. Microbiol.

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Recent laboratory experiments have exhibited microbes as promising agents in solving the perplexing origin of ancient dolomite by demonstrating microbial capability to mediate dolomite nucleation and growth. However, dolomite crystals from laboratory experiments have shown irrelevant characteristics to ancient dolomite from mineralogical and petrological perspectives. A major irrelevant characteristic is that ancient dolomite was assumed to be formed after the replacement of Ca by Mg in precursor CaCO3 in a process known as diagenesis, which contrasts with the primary precipitation process observed in laboratory culturing experiments. Considering dolomite microbial experiments, one can imply the involvement of microbes in the formation of ancient dolomite, as microbes have shown the ability to overcome the dolomite kinetic barrier. Despite that fact, the ability of microbes in mediating dolomite diagenesis has not been investigated. In this study, microbes were applied to mediate replacement of Ca by Mg in different CaCO3 precursors. The microbial replacement experiments were based on the enrichment of aerobic halophilic heterotrophic microbial consortia sampled from sediments collected from Al-Subiya sabkha in Kuwait. Two experiments were performed in saturated media at 35°C for 14 and 30 days simulating the conditions of microbial dolomite experiments. The change in mineralogy was examined via powder X-ray diffraction (XRD), and the change in texture and compositional microstructures was examined using scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS). The effect of microbes on the alteration of CaCO3 precursors was studied by comparing biotic experimentations with abiotic controls. The biotic samples were shown to result in the favorable conditions for dolomite formation including an increase in pH and alkalinity, but no changes were observed in mineralogy or compositional microstructure of CaCO3 precursors. Our results suggest the inability of aerobic halophilic heterotrophic microbial consortia to introduce Mg replacement on CaCO3 precursors in a timely manner that is comparable to primary precipitation in microbial dolomite experiments. The inability of the enriched microbial consortia to mediate replacement can be ascribed to different factors controlling the diagenetic process compared to primary precipitation in microbial dolomite experiments.

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Section: Discussionmentioning

confidence: 99%

Examining the Ability of Aerobic Halophilic Heterotrophic Microbial Consortia to Replace Ca by Mg in Different CaCO3 Precursors

Alibrahim

Dittrich

2022

Front. Microbiol.

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“…The microbial ability to nucleate dolomite was largely associated with negatively charged microbial surfaces and extracellular polymeric substances (EPSs) [17][18][19][20][21]. A laboratory-based enrichment experiment of halophilic consortia showed the formation of proto-dolomite at the expense of microbial organic biofilm, which proves the role of microbial-derived organic substances as nucleation sites for dolomite formation [22]. In a hypersaline sabkha, the in situ investigation of cyanobacterial EPSs using high-resolution 2D Raman spectroscopy has shown the close association of dolomite clusters with the EPS and organic carbon [23].…”

Section: Introductionmentioning

confidence: 99%

Imaging of Ancient Microbial Biomarkers within Miocene Dolomite (Kuwait) Using Time-of-Flight Secondary Ion Mass Spectrometry

et al. 2023

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Time-of-Flight–Secondary Ion Mass Spectrometry (ToF-SIMS) using a bismuth liquid metal ion source was utilized to characterize and image microbial biomarkers within dolomite from early-middle Miocene coastal mud volcano outcrops in Kuwait. ToF-SIMS analysis revealed biomarkers of ancient microbial consortia of sulfate reducers and methane oxidizers participating in the anaerobic oxidation of methane. The identified lipid biomarkers comprised 17α(H),21β(H)-Norhopane, Hop-17(21)-ene or Hop-22(29)-ene (diploptene), non-isoprenoidal dialkyl glycerol diethers (DAGEs), and Diacylglycerol esters (DGs). The ion µ-scale images of carbonate rocks showed two characteristic styles: (1) high signal intensity of dolomite, halite, and biomarkers, where the biomarkers demonstrate a distinctive co-localization pattern with both dolomite and halite; and (2) a lack of dolomite, halite low signal intensity, and an absence of biomarker co-localization patterns. Our results highlight three remarkable observations. Firstly, the concomitance of dolomite and halite suggests a common source of magnesium and sodium supply, likely from the hypersaline Al-Subiya sabkha. This emphasizes the importance of hypersaline seawater for dolomite formation. Secondly, microbial biomarkers correspond to methane- and sulfate-rich conditions under which dolomite was formed. Lastly, the high intensity of biomarker signals and their association with dolomite and halite indicate that the consortia involved in dolomite formation have preferences for high-salinity conditions. The three observations align with previous studies that have highlighted the importance of methane-sulfate redox, high salinity, and halophilic microbes for dolomite formation. This work is the first to acknowledge ancient microbial biomarkers within Miocene dolomite in Kuwait, which aims to broaden the understanding of the biogeochemical processes triggering dolomite formation in similar environments and ancient geologic settings.

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“…The carboxylate and other functional groups present in EPS, with their negatively charged ligands, exhibit different coordination geometries and affinity for Ca and Mg cations. This allows them to serve as nucleation sites and templates for dolomite precipitation [21,22,24].…”

Section: Introductionmentioning

confidence: 99%

Microbial Community Response to Photoelectrons and Regulation on Dolomite Precipitation in Marine Sediments of Yellow Sea

Sun

Liu

et al. 2023

Minerals

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Dolomite exhibits a wide distribution in geological strata. The metabolic activities of microorganisms in marine sediments play a crucial role in the formation of dolomite. Semiconducting minerals, such as hematite, goethite, and rutile, generate photoelectrons when exposed to sunlight, which can impact the community structure and metabolic activities of microorganisms. In this study, a simulated photoelectron system was conducted to investigate the response of the microbial community, as well as the regulation of sulfate reduction, to photoelectrons using high-throughput sequencing of the 16S rRNA gene. The regulatory effect of semiconducting mineral photoelectrons on the induction of carbonate precipitation by sulfate-reducing bacteria was explored. X-ray diffraction and Raman spectroscopy were used to characterize carbonate precipitation. During cultivation, the pH values of the system increased from 8.0 to approximately 8.5 and the rate of sulfate reduction was significantly enhanced under the influence of simulated photoelectrons. The alpha diversity of the microbial community decreased, and the semiconducting mineral photoelectronic system had a promoting effect on the enrichment of sulfate-reducing bacteria, mainly Desulfovibrio. Under the regulation of photoelectrons, sulfate-reducing bacteria can effectively oxidize organic matter and reduce sulfate in the environment, and proto-dolomite can be formed at a low Mg/Ca ratio. This process has important implications for carbon and sulfur element cycling in estuarine and oceanic photic zones, and provides a new explanation for the formation of large amounts of dolomite in geological history.

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Proto-dolomite formation in microbial consortia dominated by Halomonas strains

Cited by 10 publications

References 80 publications

Examining the Ability of Aerobic Halophilic Heterotrophic Microbial Consortia to Replace Ca by Mg in Different CaCO3 Precursors

Examining the Ability of Aerobic Halophilic Heterotrophic Microbial Consortia to Replace Ca by Mg in Different CaCO3 Precursors

Imaging of Ancient Microbial Biomarkers within Miocene Dolomite (Kuwait) Using Time-of-Flight Secondary Ion Mass Spectrometry

Microbial Community Response to Photoelectrons and Regulation on Dolomite Precipitation in Marine Sediments of Yellow Sea

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