Biomineralization of iron-phosphates in the water column of Lake Pavin (Massif Central, France)

Cosmidis, Julie; Benzerara, Karim; Morin, Guillaume; Busigny, Vincent; Lebeau, Oanez; Jézéquel, Didier; Noël, Vincent; Dublet, Gabrielle; Othmane, Guillaume

doi:10.1016/j.gca.2013.10.037

Cited by 127 publications

(144 citation statements)

References 115 publications

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“…Spring 2014 followed a winter without complete mixing of the mixolimnion. Consistent with previous descriptions [5,20,45,46,48,49], it is characterized by a sharp turbidity peak at around a 55-m depth, just below the O 2 transition zone between the oxic (mixolimnion) and anoxic (monimolimnion) layers. The pH of the lake was higher in the mixolimnion (up to pH 8) and stabilized around 6.3 in the monimolimnion.…”

Section: Resultssupporting

confidence: 87%

“…A few detrital particles, with various sizes, were observed, usually exhibiting an iron aluminosilicate composition. This is in accordance with previous X-ray absorption spectroscopy analyses that identified phyllosilicates as the main Fe-bearing phases in the monimolimnion [20].…”

Section: Mineral Phases In the Superficial Zone Of The Lake (0-30-m Dsupporting

confidence: 93%

“…Such bacteria are known to promote the formation of Fe-oxyhydroxides, such as goethite [18,19]. (2) Nitrate-dependent Fe(II)-oxidizing bacteria may also be present in the water column of meromictic lakes, as suggested by electron and X-ray microscopy analyses of Lake Pavin samples [20]. This metabolism has been shown to promote Fe-oxyhydroxide and Fe-phosphate precipitation, leading to bacterial cell encrustation [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Mineralogical Diversity in Lake Pavin: Connections with Water Column Chemistry and Biomineralization Processes

et al. 2016

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Abstract:As biominerals are good tracers of microbial interactions with the environment, they may provide signatures of microbial evolution and paleoenvironmental conditions. Since modern analogues of past environments help with defining proxies and biosignatures, we explored microbe mineral interactions in the water column of a maar lake, located in France: Lake Pavin. This lake is considered as a potential Precambrian ocean analogue, as it is ferruginous and meromictic, i.e., stratified with a superficial O 2 -rich layer (mixolimnion) and a deeper permanently anoxic layer (monimolimnion). We combined bulk chemical analyses of dissolved and particulate matter in combination with electron microscopy analyses of the particulate matter at different depths along the water column. The mineralogy changed along with water chemistry, and most of the minerals were intimately associated with microorganisms. Evolution of the redox conditions with depth leads to the successive precipitation of silica and carbonates, Mn-bearing, Fe-bearing and S-containing phases, with a predominance of phosphates in the monimolimnion. This scheme parallels the currently-assessed changes of microbial diversity with depth. The present results corroborate previous studies that suggested a strong influence of microbial activity on mineralogical diversity through extracellular and intracellular biomineralization. This paper reports detailed data on mineralogical profiles of the water column and encourages extended investigation of these processes.

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Section: Resultssupporting

confidence: 87%

Section: Mineral Phases In the Superficial Zone Of The Lake (0-30-m Dsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Mineralogical Diversity in Lake Pavin: Connections with Water Column Chemistry and Biomineralization Processes

et al. 2016

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“…The gel-like pore structure of a sediment matrix rich in organic matter, in combination with an intensified release of SRP and Fe 2+ due to microbial activity, may serve as necessary prerequisite for vivianite formation in sediments. Through the activity of bacteria, cell-mediated microenvironments within the sediment matrix may evolve, sustaining vivianite-supersaturation during crystal growth, even on a small scale (Cosmidis et al, 2014). Hydrophic, negatively charged, carbon-rich fibres which build up a structure of walls within the sediment may thereby catalyse the growth of seed crystals (Zelibor et al, 1988).…”

Section: Processes Influencing Vivianite Formationmentioning

confidence: 99%

Evidence for vivianite formation and its contribution to long-term phosphorus retention in a recent lake sediment: a novel analytical approach

et al. 2014

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Abstract. Vivianite, Fe 3 (PO 4 ) 2 · 8H 2 O, is a ferrous iron phosphate mineral which forms in waterlogged soils and sediments. The phosphorus (P) bound in its crystal lattice is considered to be immobilised because vivianite is stable under anoxic, reducing, sedimentary conditions. Thus, vivianite formation can make a major contribution to P retention during early diagenesis. Much remains unknown about vivianite in sediments, because technical challenges have rendered direct identification and quantification difficult. To identify vivianite and assess its significance for P burial during early diagenesis we studied the consequences of a 1992/1993 in-lake application of FeCl 3 and Fe(OH) 3 aimed at restoring Lake Groß-Glienicke (Berlin, Germany). In a novel approach, we firstly applied a heavy-liquid separation to the iron-rich surface sediments which allowed direct identification of vivianite by X-ray diffraction in the high-density (ρ > 2.3 g cm −3 ) sediment fraction. Secondly, we assessed the contribution of vivianite to P retention, combining results from chemical digestion with magnetic susceptibility data derived from magnetic hysteresis measurements. Scanning electron microscopy revealed that the dark blue spherical vivianite nodules were 40-180 µm in diameter, and formed of platy-and needle-shaped crystal aggregates. Although equilibrium calculations indicated supersaturation of vivianite throughout the upper 30 cm of the sediment, the vivianite deposits were homogeneously distributed within, and restricted to, the upper 23 cm only. Thus, supersaturated pore water alone cannot serve as a reliable predictor for the in situ formation of vivianite. In Lake Groß-Glienicke, vivianite formation continues to be triggered by the artificial iron amendment more than 20 yr ago, significantly contributing to P retention in surface sediments.

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“…This observation could suggest that the precipitate mineral phase is an iron phosphate such as vivianite ((Fe 2+ ) 3 (PO 4 ) 2¨8 H 2 O), but a Fe/P ratio of 9.8 ( Figure 5) is far above the value expected for any known iron phosphate. In fact, reference [39] has shown that Fe/P ratios in biogenic Fe-phosphates (vivianite and amorphous ferric phosphates) found in Lake Pavin were between 1.6 to 1.9. We cannot rule out that small nano-particles of iron phosphate coexist with another P-poor iron-rich phase.…”

mentioning

confidence: 99%

Fungal Iron Biomineralization in Río Tinto

et al. 2016

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Abstract:Although there are many studies on biomineralization processes, most of them focus on the role of prokaryotes. As fungi play an important role in different geological and biogeochemical processes, it was considered of interest to evaluate their role in a natural extreme acidic environment, Río Tinto, which has a high level of fungal diversity and a high concentration of metals. In this work we report, for the first time, the generation of iron oxyhydroxide minerals by the fungal community in a specific location of the Tinto basin. Using Transmission Electron Microscopy (TEM) and High Angle Angular Dark Field coupled with Scanning Transmission Electron Microscopy (HAADF-STEM) and Energy-Dispersive X-ray Spectroscopy (EDX), we observed fungal structures involved in the formation of iron oxyhydroxide minerals in mineralized sediment samples from the Río Tinto basin. Although Río Tinto waters are supersaturated in these minerals, they do not precipitate due to their slow precipitation kinetics. The presence of fungi, which simply provide charged surfaces for metal binding, favors the precipitation of Fe oxyhydroxides by overcoming these kinetic barriers. These results prove that the fungal community of Río Tinto participates very actively in the geochemical processes that take place there.

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Biomineralization of iron-phosphates in the water column of Lake Pavin (Massif Central, France)

Cited by 127 publications

References 115 publications

Mineralogical Diversity in Lake Pavin: Connections with Water Column Chemistry and Biomineralization Processes

Mineralogical Diversity in Lake Pavin: Connections with Water Column Chemistry and Biomineralization Processes

Evidence for vivianite formation and its contribution to long-term phosphorus retention in a recent lake sediment: a novel analytical approach

Fungal Iron Biomineralization in Río Tinto

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