Possible Fe Isotope Fractionation During Microbiological Processing in Ancient and Modern Marine Environments

Préat, Alain; Jong, Jeroen de; Ridder, Chantal De; Gillan, David

doi:10.1007/978-94-007-0397-1_29

Cited by 7 publications

(9 citation statements)

References 55 publications

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“…Their Fe isotope compositions are the same (Fig. 9), as is the range of the probable fractionation (Préat et al, 2011c).…”

Section: Iron Isotope Compositionsmentioning

confidence: 78%

“…Such analysis allowed for the recognition of a clear iron isotopic fractionation (mean -0.8‰, ranging between -1.52 to -0.06‰) on a millimeter-centimeter scale between the red and gray facies of the studied formation (Préat et al, 2006;2011c). All the analyzed red and gray samples belong to the same stratigraphic unit (Lower Rosso Ammonitico) except for one Figure 6.…”

Section: Iron Isotope Compositionsmentioning

confidence: 95%

“…sample (sample AR100 in Préat et al, 2011c) taken at the top of the Calcari Grigi (Pliensbachian) at the contact with the Lower Rosso Ammonitico (Bajocian-Callovian; Martire, 1996), where an important discontinuity associated with neptunian dykes is present. After gentle acid leaching, measurements of the Fe isotopic compositions gave δ 56 Fe values that were systematically lower in the red facies residues (median: -0.84‰, range: -1.46 to +0.26‰) compared to the gray facies residues (median: -0.08‰, range: -0.34 to +0.23‰).…”

Section: Iron Isotope Compositionsmentioning

confidence: 99%

“…In the meantime, iron isotopic compositions of iron deposits in biofi lms (E. cordatum and T. ferruginosa; Figs 4 and 6) and in tissue (connective tissue of E. cordatum) (Fig. 8) were selected from 8 samples (Préat et al, 2011c). Fe isotopic compositions (δ 56 Fe) from Fe tot solid phase (amorphous minerals) trapped in the microbial mats of E. cordatum and T. ferruginosa are negative and range between -1.78‰ and -0.74‰.…”

Section: Iron Isotope Compositionsmentioning

confidence: 99%

“…Red bar '1' is for burrowed sediments and red bar '2' is for hardgrounds and condensed levels (Italian Rosso Ammonitico). (Préat et al, 2011c).…”

Section: Referencesmentioning

confidence: 99%

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Bacterial origin of the red pigmentation of Phanerozoic carbonate rocks: an integrated study of geology-biology-chemistry (Ernest Van den Broeck medallist lecture 2017)

Préat¹,

Ridder²,

Gillan³

2018

Geol. Belg.

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Explaining the color of rocks is still a complex problem. This question was raised long ago in the community of geologists, particularly for the pigmentation of the 'red marbles' of the Frasnian of Belgium at the beginning of the last century, with many unsatisfactory hypotheses. Our recent analysis of different red carbonate rocks in Europe and North Africa (Morocco) may provide an alternative explanation for the color of these rocks. For this it was necessary to bring together diverse and complementary skills involving geologists, microbiologists and chemists. We present here a synthesis of these works. It is suggested that the red pigmentation of our studied Phanerozoic carbonate rocks, encompassing a time range from Pragian to Oxfordian, may be related to the activity of iron bacteria living in microaerophilic environments. A major conclusion is that this red color is only related to particular microenvironments and has no paleogeographic or climatic significance. All red carbonates have not necessarily acquired their pigmentation through the process established in this review. Each geological series must be analyzed in the light of a possible contribution of iron bacteria and Fungi.

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“…Their Fe isotope compositions are the same (Fig. 9), as is the range of the probable fractionation (Préat et al, 2011c).…”

Section: Iron Isotope Compositionsmentioning

confidence: 78%

Section: Iron Isotope Compositionsmentioning

confidence: 95%

Section: Iron Isotope Compositionsmentioning

confidence: 99%

Section: Iron Isotope Compositionsmentioning

confidence: 99%

“…Red bar '1' is for burrowed sediments and red bar '2' is for hardgrounds and condensed levels (Italian Rosso Ammonitico). (Préat et al, 2011c).…”

Section: Referencesmentioning

confidence: 99%

See 3 more Smart Citations

Bacterial origin of the red pigmentation of Phanerozoic carbonate rocks: an integrated study of geology-biology-chemistry (Ernest Van den Broeck medallist lecture 2017)

Préat¹,

Ridder²,

Gillan³

2018

Geol. Belg.

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Geochemical and microbiological variability of aerobic and anaerobic sediments along a bifurcated sulphate‐saturated brine spring in western Canada

Broughton

2024

The Depositional Record

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A tufa mound developed at La Saline Lake, an oxbow of the Athabasca River in the Athabasca Oil Sands deposit of north‐east Alberta, is characterised by an unusual emplacement of a gypsum caprock. This two‐tiered architecture resulted from the bicarbonate‐saturated groundwater flow along Upper Devonian limestone being redirected deeper and encountering the halite–anhydrite dissolution trend within the underlying Middle Devonian Prairie Evaporite Formation, 175 to 200 m below. Migrations up‐section of sulphate‐saturated brine resulted in the gypsum caprock on the tufa mound and discharge of a sulphate‐saturated brine spring with total dissolved solids of ca 80,000 mg/L. The brine spring is bifurcated with flows to the south‐west and north‐west. Calcite–gypsum thrombolytic bottom sediments along the south‐western branch were covered by a halite deposit and subsequently a gypsum crust with a microbial community dominated by the cyanobacteria Coleofasciculus chthonoplastes. The thrombolite contact zone with the halite–gypsum encrustation has a more diversified community with the cyanobacteria Dactylococcopsis. Cyanobacterial mats that wrap around the bulbous gypsum crust protuberances distributed along the brine pool bottom surfaces have significant eukaryotic diversity, represented by the heterotrophic Ochrophyte Paraphysomonas. In contrast, sediments accumulated along the adjacent spring branch flow to the north‐west were thicker and clogged by abundant decomposed and fermented floral debris, unlike the deposit accumulated along the south‐western branch. This resulted in an oxygen‐depleted anaerobic environment dominated by sulphate‐reducing bacteria resulting in a calcite‐rich and sulphate‐starved anaerobic sediment with ca 20% elemental sulphur and emanation of H2S gas.

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Organic remains in late Palaeoproterozoic granular iron formations and implications for the origin of granules

Dodd

Papineau

She

et al. 2018

Precambrian Research

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Toward the end of the Palaeoproterozoic era, over 10 9 billion tonnes of banded (BIF) and granules. Combined with systematically 13 C-depleted carbonate, these diagenetic mineral assemblages point to the oxidative decay of OM as a major process involved in the formation of granules. Spheroidal equidistant haematite laminations surround some granules and contain apatite associated with carbonate, OM, and ferric-ferrous silicates, and oxides that further suggest these structures were not shaped by wave-action along sediment-water interfaces, but rather by chemical wave fronts and biomineralisation. Our results demonstrate that the formation mechanisms of GIF also involve microbial activity and chemically-oscillating reactions. As such, granules have excellent potential to be considered as promising biosignatures for studying Precambrian biogeochemistry, as well as astrobiology.

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Possible Fe Isotope Fractionation During Microbiological Processing in Ancient and Modern Marine Environments

Cited by 7 publications

References 55 publications

Bacterial origin of the red pigmentation of Phanerozoic carbonate rocks: an integrated study of geology-biology-chemistry (Ernest Van den Broeck medallist lecture 2017)

Bacterial origin of the red pigmentation of Phanerozoic carbonate rocks: an integrated study of geology-biology-chemistry (Ernest Van den Broeck medallist lecture 2017)

Geochemical and microbiological variability of aerobic and anaerobic sediments along a bifurcated sulphate‐saturated brine spring in western Canada

Organic remains in late Palaeoproterozoic granular iron formations and implications for the origin of granules

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