The role of microbial extracellular polymeric substances on formation of sulfate minerals and fibrous Mg-clays

Buey, Pablo Del; Sanz‐Montero, M. Esther; Braissant, Olivier; Cabestrero, Óscar; Visscher, Pieter T.

doi:10.1016/j.chemgeo.2021.120403

Cited by 21 publications

(11 citation statements)

References 62 publications

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“…SO 4 2− multiplied gradually and contributed much to increasing EC and salinity (SO 4 2− vs. EC, r = 0.869, p ≤ 0.01; SO 4 2− vs. ORP, r = −0.621, p ≤ 0.05). The observed positive relationship between BIX and EC indicated that microbial behavior stimulated minerals to be liberated or disintegrate in the cropland area, e.g., extracellular polymeric substances encapsulated in particulates which promoted mineral disintegration, ascribed to the diagenetic effects of aquatic organism metabolism [ 18 , 41 ]. As for as PC1, HIX and DOC were the primary negative contributors.…”

Section: Discussionmentioning

confidence: 99%

The Optical Characterization and Distribution of Dissolved Organic Matter in Water Regimes of Qilian Mountains Watershed

Xiao

Chen

Zhang

et al. 2021

IJERPH

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The constituents and content of dissolved organic matter (DOM) in the Qilian Mountain watershed were characterized with a spectroscopic technique, especially 3-DEEM fluorescence assisted by parallel factor (PARAFAC) analysis. The level of DOM in the surrounding area of Qinghai lake (thereafter the lake in this article specifically refers to Qinghai Lake)was highest at 9.45 mg C·L−1 and about 3 times less (3.09 mg C·L−1) in a cropland aquatic regime (the lowest value). In general, DOM was freshly autochthonously generated by plankton and plant debris, microorganisms and diagenetic effects in the aquatic environment (FI > 1.8). Component 1 (humic acid-like) and 3 (fulvic acid-like) determined the humification degree of chromophoric dissolved organic matter (CDOM). The spatial variation of sulfate and nitrate in the surrounding water regime of the lake revealed that organic molecules were mainly influenced by bacterial mediation. Mineral disintegration was an important and necessary process for fluorescent fraction formation in the cropland water regime. Exceptionally, organic moiety in the unused land area was affected by anespecially aridclimate in addition to microbial metabolic experience. Salinity became the critical factor determining the distribution of DOM, and the total normalized fluorescent intensity and CDOM level were lower in low-salinity circumstances (0.2–0.5 g·L−1) with 32.06 QSU and 1.38 m−1 in the grassland area, and higher salinity (0.6~0.8 g·L−1) resulted in abnormally high fluorescence of 150.62 QSU and absorption of 7.83 m−1 in the cropland water regime. Climatic conditions and microbial reactivity controlled by salinity were found to induce the above results. Our findings demonstrated that autochthonous inputs regulated DOM dynamics in the Qilian Mountains watershed of high altitude.

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Section: Discussionmentioning

confidence: 99%

The Optical Characterization and Distribution of Dissolved Organic Matter in Water Regimes of Qilian Mountains Watershed

Xiao

Chen

Zhang

et al. 2021

IJERPH

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“…Microbial activity may also directly influence mineralisation by causing chemical changes within the EPS and surrounding pore waters that promote the precipitation of carbonate and clay minerals (e.g. del Buey et al, 2021; Moore, Gong, et al, 2020; Van Lith et al, 2003; Vasconcelos & McKenzie, 1997). For example, sulfate‐reducing bacteria, which are recognised as a common driver of microbial carbonate formation, reduce the

{SO}_{4}^{2 -}

Section: Discussionmentioning

confidence: 99%

“…del Buey et al, 2021; Moore, Gong, et al, 2020; Van Lith et al, 2003; Vasconcelos & McKenzie, 1997). For example, sulfate‐reducing bacteria, which are recognised as a common driver of microbial carbonate formation, reduce the

{SO}_{4}^{2 -}

ion concentration and locally increase alkalinity; this can enhance the precipitation of carbonate and silicate minerals (Braissant et al, 2007; del Buey et al, 2021; Krause et al, 2012; Vasconcelos et al, 1995; Wright, 1999; Zhang et al, 2012). The presence of NH 4 + ions produced by several different microbial processes in soils and porewaters has also been shown to induce carbonate precipitation (Görgen et al, 2021) and they could also reduce the energy for Mg dehydration.…”

Section: Discussionmentioning

confidence: 99%

“…del Buey et al, 2021;Van Lith et al, 2003;Vasconcelos & McKenzie, 1997). For example, sulfate-reducing bacteria, which are recognised as a common driver of microbial carbonate formation, reduce the SO 2− 4 ion concentration and locally increase alkalinity; this can enhance the precipitation of carbonate and silicate minerals (Braissant et al, 2007;del Buey et al, 2021;Krause et al, 2012;Vasconcelos et al, 1995;Wright, 1999;Zhang et al, 2012).…”

Section: The Role Of Eps In Dolomite and Clay Mineralisationmentioning

confidence: 99%

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Microbial influence on dolomite and authigenic clay mineralisation in dolocrete profiles of NW Australia

et al. 2023

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Dolomite (CaMg(CO3)2) precipitation is kinetically inhibited at surface temperatures and pressures. Experimental studies have demonstrated that microbial extracellular polymeric substances (EPS) as well as certain clay minerals may catalyse dolomite precipitation. However, the combined association of EPS with clay minerals and dolomite and their occurrence in the natural environment are not well documented. We investigated the mineral and textural associations within groundwater dolocrete profiles from arid northwest Australia. Microbial EPS is a site of nucleation for both dolomite and authigenic clay minerals in this Late Miocene to Pliocene dolocrete. Dolomite crystals are commonly encased in EPS alveolar structures, which have been mineralised by various clay minerals, including montmorillonite, trioctahedral smectite and palygorskite‐sepiolite. Observations of microbial microstructures and their association with minerals resemble textures documented in various lacustrine and marine microbialites, indicating that similar mineralisation processes may have occurred to form these dolocretes. EPS may attract and bind cations that concentrate to form the initial particles for mineral nucleation. The dolomite developed as nanocrystals, likely via a disordered precursor, which coalesced to form larger micritic crystal aggregates and rhombic crystals. Spheroidal dolomite textures, commonly with hollow cores, are also present and may reflect the mineralisation of a biofilm surrounding coccoid bacterial cells. Dolomite formation within an Mg‐clay matrix is also observed, more commonly within a shallow pedogenic horizon. The ability of the negatively charged surfaces of clay and EPS to bind and dewater Mg2+, as well as the slow diffusion of ions through a viscous clay or EPS matrix, may promote the incorporation of Mg2+ into the mineral and overcome the kinetic effects to allow disordered dolomite nucleation and its later growth. The results of this study show that the precipitation of clay and carbonate minerals in alkaline environments may be closely associated and can develop from the same initial amorphous Ca–Mg–Si‐rich matrix within EPS. The abundance of EPS preserved within the profiles is evidence of past microbial activity. Local fluctuations in chemistry, such as small increases in alkalinity, associated with the degradation of EPS or microbial activity, were likely important for both clay and dolomite formation. Groundwater environments may be important and hitherto understudied settings for microbially influenced mineralisation and for low‐temperature dolomite precipitation.

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“…In Mari Ermi, these phyllosilicates are detected in association with the "organic-rich phase" cluster suggesting a possible intimate association of these mineral phases with organic matter, if the latter is not just resin. Similarly, past studies reporting these phases evidenced their frequent association with organic molecules, especially extracellular polymeric substance (EPS) that may favour their precipitation (Konhauser and Urrutia, 1999;Souza-Egipsy et al, 2005;Perri et al, 2017;del Buey et al, 2018del Buey et al, , 2021Pace et al, 2018). It has been shown that the nature of the Mg-phyllosilicate phase that is precipitated (i.e.…”

Section: Advantage Of the Quantitative Sem-edxs Approach: Identifying...mentioning

confidence: 95%

Mapping mineralogical heterogeneities at the nm-scale by scanning electron microscopy in modern Sardinian stromatolites: Deciphering the origin of their laminations

et al. 2022

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The role of microbial extracellular polymeric substances on formation of sulfate minerals and fibrous Mg-clays

Cited by 21 publications

References 62 publications

The Optical Characterization and Distribution of Dissolved Organic Matter in Water Regimes of Qilian Mountains Watershed

The Optical Characterization and Distribution of Dissolved Organic Matter in Water Regimes of Qilian Mountains Watershed

Microbial influence on dolomite and authigenic clay mineralisation in dolocrete profiles of NW Australia

Mapping mineralogical heterogeneities at the nm-scale by scanning electron microscopy in modern Sardinian stromatolites: Deciphering the origin of their laminations

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