Biological carbon precursor to diagenetic siderite with spherical structures in iron formations. 2016 SPP Building a Habitable Earth Meeting in Cologne, Poster: DIfferent phases of carbonaceous matter in microbial mats of the Moodies Group in …

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graphs, Fe, C and O isotope of siderite, and organic C isotope of the whole rock from the ~2.52 Ga Dagushan BIF in the Anshan area, China, to discuss the origin of siderite. There are small magnetite grains that occur as inclusions within siderite, suggesting a diagenetic origin of the siderite.

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In the future I will focus on biological structures and signatures in BIFs of the Moodies and Fig Tree Group of the Barberton Greenstone Belt. ... Biological carbon precursor to diagenetic siderite spherulites in banded iron formations, showing the …

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Biological carbon precursor to diagenetic siderite with spherical structures in iron formations. Nature Communications, 2013; 4: 1741 DOI: 10.1038/ncomms2770 Cite This Page :

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Biological Carbon Precursor to Diagenetic Siderite With Spherical Structures in Iron Formations _ Nature Communications _ Nature Publishing Group. Uploaded by. cosmibota. Studiul Zacamntului de Limonit Oolitic Si de Glauconit Din Formatiunile Eocene Ale Bazinului Transilvaniei I. …

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siderite, calcite, and dolomite concretions have developed during shallow burial in a range of freshwater to marine depositional settings, the carbon originating mainly from early diagenetic, bacterially mediated reactions involving the decomposition of organic matter in bottom sediments. A summary S18O-8I3C diagram showing mean and standard-

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Alternatively, siderite can be formed during the diagenetic (biological or non-biological), and subsequent metamorphic, oxidation of microbial biomass to CO 2 /bicarbonate coupled to the reduction ...

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Biological carbon precursor to diagenetic siderite with spherical structures in iron formations Inga Ko¨hler1, Kurt O. Konhauser2, Dominic Papineau3,4, Andrey Bekker5 & Andreas Kappler1 During deposition of Precambrian iron formation, the combined sedimentation of ferrihydrite

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Furthermore, the nucleation pathway for siderite is unclear, for example, whether there is a less stable carbonate precursor to siderite such as amorphous calcium carbonate (ACC), amorphous iron (II) carbonate (AFC) (Dideriksen et al., 2015; Jiang & Tosca, 2019; Sel et al., 2012) or monohydrocalcite (MHC) and whether siderite (both nodular or ...

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of growth. What is interesting is that if diagenetic siderite formation is the dominant pathway to form siderite concretions, then they may reflect conditions within the sediment column rather than condi-tions related to the overall ocean–atmosphere system. Hence, study of the formation of siderite in the laboratory and in the natural en-

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after siderite (Loope et al., 2011). These relation-ships indicate not only that the concretions of the Navajo Sandstone had siderite precursors, but also that these formed during late diagenesis. Siderite is easily overlooked both in the field and in the laboratory (Berner, 1971). Because it is unstable in the presence of molecular oxygen, a

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Le rôle des bactéries dans l'origine des formations de fer (IF) reste flou car il n'existe aucune preuve directe de leur implication. Cette étude montre que la sidérite sphérique dans les FI profondes représente une biosignature pour la photoferrotrophie, alors que la sidérite massive reflète une biomasse cyanobactérienne élevée dans les eaux peu profondes.

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ARTICLE Received 26 Sep 2012 | Accepted 19 Mar 2013 | Published 23 Apr 2013 DOI: 10.1038/ncomms2770 Biological carbon precursor to diagenetic siderite with spherical structures in iron formations Inga Ko¨hler1, Kurt O. Konhauser2, Dominic Papineau3,4, Andrey Bekker5 & Andreas Kappler1 During deposition of Precambrian iron formation, the combined sedimentation of ferrihydrite …

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Biological carbon precursor to diagenetic siderite with spherical structures in iron formations. Köhler I, Konhauser KO, Papineau D, Bekker A, Kappler A. Nat Commun, 4:1741, 01 Jan 2013 Cited by: 8 articles | PMID: 23612282

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the spherulitic siderite in transported siltstone intraclasts as their sources of energy and carbon. The ferrous iron ... (1981) classification, diagenetic siderite forms in sediments that are anoxic, nonsulfidic, and methanic. Siderite is typically ... calculations for Navajo spheroidal concretions favor siderite as the original (precursor ...

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Here we show experi-mentally that spheroidal siderite, which is preserved in many iron formation and could have been precursor to rhombohedral or massive siderite, forms by reacting ferrihydrite with glucose (a proxy for microbial biomass) at pressure and temperature conditions typical of diagenesis (170 C …

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Biological carbon precursor to diagenetic siderite with spherical structures in iron formations I. KÖHLER1*, K. O. KONHAUSER2, D. PAPINEAU3, A. BEKKER4 AND A. KAPPLER5 1Friedrich-Schiller-University, Institute of Geosciences, Jena, Germany (*[email protected]) 2University of Alberta, Department of Earth and Atmospheric Sciences, Edmonton ...

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Biological carbon precursor to diagenetic siderite with spherical structures in iron formations more by Kurt Konhauser, Andreas Kappler, and Inga Köhler Publication Date: 2013

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Biological carbon precursor to diagenetic siderite with spherical structures in iron formations. By Kurt Konhauser, Andreas Kappler, and Inga Köhler. Download pdf.

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Biological carbon precursor to diagenetic siderite with spherical structures in iron formations Kappler, Andreas ; Köhler, Inga ( 2013 ) Simulating diagenesis in precambrian banded iron formations

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Diagenetic carbonate minerals in upper Cenozoic sediments recovered from the New Jersey slope are a byproduct of organic matter degradation and the dissolution of precursor biogenic calcite, mostly foraminifers and nannofossils. The diage-netic carbonate …

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Diagenesis (/ ˌ d aɪ. ə ˈ dʒ ɛ n. ə. s ɪ s /) is the process that describes physical and chemical changes in sediments first caused by water-rock interactions, microbial activity, and compaction after their deposition. Increased pressure and temperature only start to play a role as sediments become buried much deeper in the Earth's crust. In the early stages, the transformation of ...

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progressive oxidation of siderite concretions, with the rinds reflecting the shapes of their siderite-cemented precursor concretions. Van der Burg (1969, 1970) provided another example (from Pleis-tocene fluvial sands of the Netherlands) of rinded, iron oxide–cemented concretions that formed via the oxidation of a siderite-cemented precursor.

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Biological carbon precursor to diagenetic siderite with spherical structures in iron formations. I Köhler, KO Konhauser, D Papineau, A Bekker, A Kappler. Nature Communications 4 (1), 1-7, 2013. 78: 2013: High primary productivity and nitrogen cycling after the Paleoproterozoic phosphogenic event in the Aravalli Supergroup, India.

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Previous studies concluded that organic matter, in association with Fe(III) mineral precipitates, forms spherical siderite structures under diagenetic conditions (Kohler et al. 2012). Rhombohedral siderite seen in the sample could have formed from a spheroidal siderite precursor, accounting for the spheroidal voids in some siderite cores.

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However, because non-biological decarbonation reactions and Fischer-Tropsch-type synthesis 5 can produce reduced carbon with similar isotopic compositions, non-biological interpretations are ...

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We infer early diagenetic growth of siderite crystals as a response to sedimentary organic carbon degradation and the accumulation of dissolved inorganic carbon in pore waters. We suggest that siderite formation proceeds through syntaxial growth on preexisting siderite crystals, or possibly through aging of precursor carbonate green rust.

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Biological carbon precursor to diagenetic siderite with spherical structures in iron formations by Kurt O. Konhauser, Dominic Papineau, Andrey Bekker During deposition of Precambrian iron formation, the combined sedimentation of ferrihydrite and phytoplankton biomass should have facilitated Fe(III) reduction during diagenesis.

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[3] K Hler I, Konhauser K O, Papineau D, et al. Biological carbon precursor to diagenetic siderite with spherical structures in iron formations[J]. Nature Communications.

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Carbon isotopes have been extensively used as evidence for the appearance of life on Earth (see Schopf and Klein, 1992), and simultaneously for the "invention" of carbon fixation. Mojzsis et al. (1996) used these approaches to push the earliest evidence for life back to 3.8 Ga. However, as often occurs with such ancient samples, the age of the samples has been debated (Kamber and Moorbath ...

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