Iron isotopes in an Archean ocean analogue

Busigny, Vincent; Planavsky, Noah J.; Jézéquel, Didier; Crowe, Sean A.; Louvat, Pascale; Moureau, Julien; Viollier, Éric; Lyons, Timothy W.

doi:10.1016/j.gca.2014.03.004

Cited by 117 publications

(116 citation statements)

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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%

“…Therefore, linking mineralogical and microbial diversities in modern environments is crucial to understand microbe-mineral interactions in the past, i.e., from the first steps of microbial life onward. Among the modern environments that provide conditions analogous to those supposed to have dominated on early Earth, meromictic lakes are first choice sites [5]. Indeed, such lakes are permanently stratified with a superficial O 2 -rich layer (the mixolimnion, affected by seasonal mixing) and a deeper anoxic layer (the monimolimnion, never intermixed with the upper layer) separated by a zone called the oxycline exhibiting strong O 2 gradients.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, some meromictic lakes are ferruginous, which is an additional property shared with Archean and Proterozoic oceans [8][9][10][11]. Finally, whereas most stratified water bodies (e.g., the Black Sea) are euxinic and, thus, good analogues of the period following the GOE, non-sulfidic meromictic lakes may constitute good analogues of the pre-GOE ocean [5,12].…”

Section: Introductionmentioning

confidence: 99%

“…(4) Finally, multiple sulfur-cycling microorganisms are present in these lakes [17,32]. Chemical and Fe isotope analyses of sedimentary pyrite (FeS 2 ) suggest that these microbes may contribute to Fe sulfide precipitation in the water column [5,33,34].…”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…These Mo isotope signatures likely required an oxygenated water column and delivery of Mn(IV) oxides to the sediment pile, given rapid Mn(IV) oxide reduction via Fe 2+ (e.g., Busigny et al, 2014). This implies that these signatures cannot be easily linked to anoxygenic photosynthetic Mn(II) oxidation more than a half of billion years before the GOE.…”

Section: Evidence In the Rock Record For The Evolution Of Oxygenic Phmentioning

confidence: 99%

Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Konhauser

Planavsky

Hardisty

et al. 2017

Earth-Science Reviews

332

245

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Formation and Transformation of Iron‐Bearing Minerals by Iron(II)‐Oxidizing and Iron(III)‐Reducing Bacteria

Miot

Etique

2016

Iron Oxides

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Iron isotopes in an Archean ocean analogue

Cited by 117 publications

References 100 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

Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Formation and Transformation of Iron‐Bearing Minerals by Iron(II)‐Oxidizing and Iron(III)‐Reducing Bacteria

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