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biological carbon precursor to diagenetic siderite with

Biological carbon precursor to diagenetic siderite with ...

2013-4-23  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 ...

Biological carbon precursor to diagenetic siderite with spherical structures in iron formations. Köhler I(1), Konhauser KO, Papineau D, Bekker A, Kappler A. Author information: (1)Geomicrobiology Group, Center for Applied Geoscience, University of Tuebingen, Sigwartstrasse 10, 72076 Tuebingen, Germany.

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Biological carbon precursor to diagenetic siderite with ...

2016-6-13  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 ...

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 ...

Request PDF Biological carbon precursor to diagenetic siderite spherulites in banded iron formations 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

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Biological carbon precursor to diagenetic siderite with ...

Biological carbon precursor to diagenetic siderite with spherical structures in iron formations By I Koehler, KO Konhauser, D Papineau, A Bekker and A Kappler Cite

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Formation of diagenetic siderite in modern

Spheroidal siderite is often inferred to be a water-column precipitate and precursor for rhombohedral and cemented diagenetic siderites in Precambrian rocks (Konhauser et al., 2005; Köhler et al., 2013). In contrast, the preservation of residual phases trapped in spheroidal mosaic siderite crystals in Lake Towuti may, if primary, suggest ...

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Dr. Inga Köhler

2019-10-15  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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Sideritic ironstones as indicators of depositional ...

2017-12-7  Biological carbon precursor to diagenetic siderite with spherical structures in iron formations. Nature Communications 4, 1741. Lake, R. D. Shephard-Thorn, E. R. 1987. Geology of the Country around Hastings and Dungeness. Memoir for 1:50,000 geological sheets 320 and 321 (England and Wales). ... Occurrence, Analysis, and Biological Relevance ...

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Précurseur de carbone biologique à la sidérite ...

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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Formation of diagenetic siderite in modern

Spheroidal siderite is often inferred to be a water-column precipitate and precursor for rhombohedral and cemented diagenetic siderites in Precambrian rocks (Konhauser et al., 2005; Köhler et al., 2013). In contrast, the preservation of residual phases trapped in spheroidal mosaic siderite crystals in Lake Towuti may, if primary, suggest ...

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(PDF) Simulating Precambrian banded iron formation ...

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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Dr. Inga Köhler

2019-10-15  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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Can someone recommend literature on fossil

Biological carbon precursor to diagenetic siderite with spherical structures in iron formations. Nature communications, 4, 1741. ... Biological carbon precursor to diagenetic siderite with ...

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Sideritic ironstones as indicators of depositional ...

2017-12-7  Biological carbon precursor to diagenetic siderite with spherical structures in iron formations. Nature Communications 4, 1741. Lake, R. D. Shephard-Thorn, E. R. 1987. Geology of the Country around Hastings and Dungeness. Memoir for 1:50,000 geological sheets 320 and 321 (England and Wales). ... Occurrence, Analysis, and Biological Relevance ...

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Formation of diagenetic siderite in modern ferruginous ...

2019-5-31  ses. 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 crys - tals, or possibly through aging of precursor carbonate green rust.

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Hydrothermal and resedimented origins of the

Inga Köhler, Kurt O Konhauser, Dominic Papineau, Andrey Bekker, Andreas Kappler, Biological carbon precursor to diagenetic siderite with spherical structures in iron formations, Nature Communications, 10.1038/ncomms2770, 4, 1, (2013).

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Carbon and oxygen isotope ratios in diagenetic

The Wadi Shatti occurrence is notable for the presence of magnetite, rarely reported in unmetamorphosed Phanerozoic ironstones, and for the presence of thin coal seams, uncommon in older ironstones.Oxygen isotope fractionation between magnetite and siderite, if produced by an equilibrium reaction, indicates that magnetite formed diagenetically ...

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Simulating Precambrian banded iron formation

2013-12-20  1. Introduction. Low-grade diagenetic to metamorphic overprinting by temperature and pressure yields secondary minerals that obscure our understanding of primary depositional mechanisms (Han, 1966, Dimroth and Chauvel, 1973, Perry et al., 1973, Han, 1978, Walker, 1984, Klein, 2005, Bekker et al., 2010).This poses a barrier to the reconstruction of early Earth environments using ancient ...

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Sideritic ironstones as indicators of depositional ...

2017-12-7  Biological carbon precursor to diagenetic siderite with spherical structures in iron formations. Nature Communications 4, 1741. Lake, R. D. Shephard-Thorn, E. R. 1987. Geology of the Country around Hastings and Dungeness. Memoir for 1:50,000 geological sheets 320 and 321 (England and Wales). ... Occurrence, Analysis, and Biological Relevance ...

More

Formation of diagenetic siderite in modern ferruginous ...

2019-5-31  ses. 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 crys - tals, or possibly through aging of precursor carbonate green rust.

More

Inga Köhler - Academia.edu

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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Carbon and oxygen isotope ratios in diagenetic

The Wadi Shatti occurrence is notable for the presence of magnetite, rarely reported in unmetamorphosed Phanerozoic ironstones, and for the presence of thin coal seams, uncommon in older ironstones.Oxygen isotope fractionation between magnetite and siderite, if produced by an equilibrium reaction, indicates that magnetite formed diagenetically ...

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Inga Köhler - Friedrich-Schiller-Universität Jena

2015-7-29  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 role of biological

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Simulating Precambrian banded iron formation

2013-12-20  1. Introduction. Low-grade diagenetic to metamorphic overprinting by temperature and pressure yields secondary minerals that obscure our understanding of primary depositional mechanisms (Han, 1966, Dimroth and Chauvel, 1973, Perry et al., 1973, Han, 1978, Walker, 1984, Klein, 2005, Bekker et al., 2010).This poses a barrier to the reconstruction of early Earth environments using ancient ...

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Uncovering the Origin of Magnetism in Early Proterozoic ...

2018-12-18  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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Rinded iron-oxide concretions: hallmarks of altered ...

2012-9-19  Siderite is vulnerable to complete oxidation upon exposure, so the distinctive rinded concretions are valuable clues that aid in deciphering diagenetic histories and for recognizing methanic floodplain palaeoenvironments and wet palaeoclimate. Keywords Concretion, Dakota Formation, Navajo Sandstone, Nebraska, palaeosol, rattlestone, siderite.

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Diagenesis - an overview ScienceDirect Topics

Diagenesis. Diagenesis is defined in the Glossary of Geology (Jackson, 1997) as “All the chemical, physical, and biologic changes undergone by a sediment after its initial deposition, and during and after its lithification, exclusive of surficial alteration (weathering) and metamorphism. From: Developments in Petroleum Science, 2013.

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THE GEOLOGIC CONTEXT OF WONDERSTONE: A

2016-6-3  siderite, forming concretions of varied shapes and sizes. No siderite is preserved in Navajo concretions, but abundant rhombic, iron-oxide pseudomorphs after siderite are present in the centers of large (meter-scale) concretions that are bounded by dense, iron-oxide rinds. The pseudomorphs are evidence that siderite crystals cemented the precursor

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Carbon and oxygen isotope ratios in diagenetic

The Wadi Shatti occurrence is notable for the presence of magnetite, rarely reported in unmetamorphosed Phanerozoic ironstones, and for the presence of thin coal seams, uncommon in older ironstones.Oxygen isotope fractionation between magnetite and siderite, if produced by an equilibrium reaction, indicates that magnetite formed diagenetically ...

More

Diagenesis - an overview ScienceDirect Topics

Diagenesis. Diagenesis is defined in the Glossary of Geology (Jackson, 1997) as “All the chemical, physical, and biologic changes undergone by a sediment after its initial deposition, and during and after its lithification, exclusive of surficial alteration (weathering) and metamorphism. From: Developments in Petroleum Science, 2013.

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Stable oxygen and carbon isotope compositional fields

2018-6-2  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 δ18O-δ13C diagram showing mean and standard-

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Stable oxygen and carbon isotope compositional fields

2016-6-8  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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Microbial mineralization of organic matter

Diagenetic degradation of organic matter with geochemical and isotopic characteristics of diagenetic carbonates presence of Fe reaction symbol or Mn 613C mineralogy Mn(IV) reduction MnR yes -25 %o rhodocrosite Fe(III) reduction FeR yes -25 % siderite sulphate reduction SR no -25%, calcite or dolomite acetate Me yes + 15%, calcite, dolomite or ...

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THE GEOLOGIC CONTEXT OF WONDERSTONE: A

2016-6-3  siderite, forming concretions of varied shapes and sizes. No siderite is preserved in Navajo concretions, but abundant rhombic, iron-oxide pseudomorphs after siderite are present in the centers of large (meter-scale) concretions that are bounded by dense, iron-oxide rinds. The pseudomorphs are evidence that siderite crystals cemented the precursor

More

Simulating Precambrian banded iron formation

Post-depositional diagenetic alteration makes the accurate interpretation of key precipitation processes in ancient sediments, such as Precambrian banded iron formations (BIFs), difficult. While microorganisms are proposed as key contributors to BIF deposition, the diagenetic transformation of precursor Fe(III) minerals associated with ...

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Rinded iron-oxide concretions: Hallmarks of altered ...

In all three deposits, rinded concretions formed when pre-existing, siderite-cemented concretions were oxidized within a sand matrix. Unlike fluvial examples, siderite in the Navajo Sandstone was autochthonous and of late diagenetic origin, having precipitated from carbon dioxide and methane-enriched waters moving through folded and jointed strata.

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30. ZONATION OF AUTHIGENIC CARBONATES WITHIN

2000-6-30  siderite between 120 and 450 mbsf. This interval is characterized by high alkalinity (40–120 mM) and low Ca 2+ and Mg con-centrations, conditions that are consistent with siderite formation. INTRODUCTION One of the objectives of Ocean Drilling Program (ODP) Leg 164 was to establish the diagenetic effects associated with gas hydrate

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Anoxic photochemical oxidation of siderite generates ...

2013-6-18  Photochemical reactions of minerals are underappreciated processes that can make or break chemical bonds. We report the photooxidation of siderite (FeCO3) by UV radiation to produce hydrogen gas and iron oxides via a two-photon reaction. The calculated quantum yield for the reaction suggests photooxidation of siderite would have been a significant source of molecular hydrogen for the first ...

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