Cited by 192Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisGeological and Geochemical Analysis

Suboxic diagenesis in banded iron formations

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Walker, James C. G.·1984·Nature

Abstract

Anomalous isotopic composition has been reported for the carbon in carbonate minerals of banded iron formations. Well studied examples show and enrichment in the light isotope of carbon, 12C. This enrichment presumably reflects unusual circumstances in the deposition of these sedimentary rocks. It is suggested here that the isotopically-light carbonate results from early diagenetic oxidation by bacteria of substantial amounts of isotopically light organic carbon. The electron acceptor that permits oxidation in the absence of free oxygen is presumed to the iron(III) which may have been significantly more abundant in the initial chemical precipitate than in the post-diagenetic sedimentary rock.

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  • Coupling the reduction of some Fe(III) minerals to the oxidation of organic matter explains the low content of organic carbon in IFs (<0.5 wt.%), the highly negative δ13C values of early diagenetic Fe(II)-rich carbonates, the small-scale heterogeneity in δ56Fe values, the presence of Fe(II)-bearing minerals in IF, and the general lack of microfossils preserved in Fe-rich layers lacking siliciation

    “Significantly, coupling the reduction of some Fe(III) minerals to the oxidation of organic matter not only explains the low content of organic carbon in IFs (&lt;0.5 wt.%; Gole and Klein, 1981), but it also explains highly negative δ 13 C values of the early diagenetic Fe(II)-rich carbonates (Perry et al., 1973; Walker, 1984; Baur et al., 1985; Heimann et al., 2010; Craddock and Dauphas,”
  • The ferric minerals in IF would have represented a favourable electron acceptor for the oxidation of organic matter through DIR by various bacteria and archaea.

    “By contrast, the ferric minerals in IF would have represented a favourable electron acceptor for the oxidation of organic matter (Walker, 1984; Nealson and Myers, 1990) through DIR by various bacteria and archaea”

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1 of the 35 references couldn’t be matched to a known paper.

Research works printed but not linked: 3

  1. [8]Button, A. et al. in Mineral Deposits and the Evolution of the Biosphere (eds Holland, H. D. &amp; Schidlowski, M.) 259–273 (Springer, Berlin, 1982).
  2. [12]Compston. W et al. 6th Aust. Geol. Conv. Geol. Soc. Aust. Abstr. 3, 40 (1981).
  3. [20]Schidlowski, M., Hayes, J. M. &amp; Kaplan, I. R. in Earth's Earliest Biosphere: Its Origin and Evolution (ed. Schopf, J. W.) 149–186 (Princeton University Press, 1983).

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Authors
Walker, J. C. G.
Affiliations
University of Michigan (US)
Corresponding author
Walker, James C. G.
Venue
Nature
Published
1984-05
Volume
309
Issue
5966
Pages
340-342
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2076321104
Cited by
192
References
35
Citations by year
2026: 4 · 2025: 6 · 2024: 5 · 2023: 7 · 2022: 6 · 2021: 5 · 2020: 4 · 2019: 7 · 2018: 2 · 2017: 8 · 2016: 2 · 2015: 5 · 2014: 8 · 2013: 12 · 2012: 6
FWCI
4.99
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Deep Blue (University of Michigan) (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
Keywords
banded iron formations, carbon isotopes, carbonate minerals, bacterial oxidation, organic carbon, early diagenesis
MeSH terms
Anaerobiosis, Bacteria, Carbon, Carbon Isotopes, Carbonates, Ferric Compounds, Ferrous Compounds, Iron, Oxidation-Reduction, Seawater, Water Microbiology, Geologic Sediments

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