Cited by 1,013Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisGeological and Geochemical Analysis

Iron formation: the sedimentary product of a complex interplay among mantle, tectonic, oceanic, and biospheric processes

Bekker, A., Slack, J. F., Planavsky, N., Krapez, B., Hofmann, A., Konhauser, K. O., Rouxel, O. J.·2010·Economic Geology

Abstract

Iron formations are economically important sedimentary rocks that are most common in Precambrian sedi-mentary successions. Although many aspects of their origin remain unresolved, it is widely accepted that sec-ular changes in the style of their deposition are linked to environmental and geochemical evolution of Earth. Two types of Precambrian iron formations have been recognized with respect to their depositional setting. Al-goma-type iron formations are interlayered with or stratigraphically linked to submarine-emplaced volcanic rocks in greenstone belts and, in some cases, with volcanogenic massive sulfide (VMS) deposits. In contrast, larger Superior-type iron formations are developed in passive-margin sedimentary rock successions and gener-ally lack direct relationships with volcanic rocks. The early distinction made between these two iron-formation types, although mimimized by later studies, remains a valid first approximation. Texturally, iron formations were also divided into two groups. Banded iron formation (BIF) is dominant in Archean to earliest Paleopro-terozoic successions, whereas granular iron formation (GIF) is much more common in Paleoproterozoic suc-cessions. Secular changes in the style of iron-formation deposition, identified more than 20 years ago, have

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Crossref · 10.2113/gsecongeo.105.3.467

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  • Superior-type iron formations can be very laterally extensive, with original aerial extents estimated in some cases to be over 100,000 km2.

    “Superior-type IFs can be very laterally extensive, with original aerial extents estimated in some cases to be over 100,000 km 2 (Isley, 1995; Bekker et al., 2010).”
  • The sulfide-facies iron formations described by James (1954) are now believed to be pyritic carbonaceous shales and ferruginous slates, and therefore do not represent a chemical precipitate.

    “The sulfide-facies IF described by James (1954) are now believed to be pyritic carbonaceous shales and ferruginous slates, and therefore do not represent a chemical precipitate (Bekker et al., 2010).”
  • Most IF precursor sediments were deposited in offshore environments with limited siliciclastic input and low sedimentation rates.

    “(ii) most IF precursor sediments were deposited in offshore environments with limited siliciclastic input and low sedimentation rates”
  • The size of the DIC reservoir was significantly larger in the Archaean than in the modern ocean.

    “there is nearly unanimous agreement that (i) the size of the DIC reservoir was significantly larger in the Archaean than in the modern ocean”
  • Although IF sedimentation was likely highly pulsed and variable, slow net accumulation rates were probably linked to a low siliciclastic flux that allowed for accumulation of pure chemical sediments.

    “although IF sedimentation was likely highly pulsed and variable (Bekker et al., 2010; Haugaard et al., 2016a), slow net accumulation rates were probably linked to a low siliciclastic flux that allowed for accumulation of pure chemical sediments”

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Authors
Bekker, A., Slack, J. F., Planavsky, N., Krapez, B., Hofmann, A., Konhauser, K. O., & Rouxel, O. J.
Venue
Economic Geology
Published
2010-05-01
Volume
105
Issue
3
Pages
467-508
ISSN
0361-0128 (ISSN-L)
OpenAlex
W2168225982
Cited by
1,013
References
354
Citations by year
2026: 51 · 2025: 74 · 2024: 78 · 2023: 73 · 2022: 82 · 2021: 70 · 2020: 58 · 2019: 66 · 2018: 69 · 2017: 75 · 2016: 62 · 2015: 65 · 2014: 57 · 2013: 51 · 2012: 36
FWCI
29.66
Type
journal article
Language
en
Open access
closed
Locations
  • Economic Geology (publishedVersion)
  • eSpace (Curtin University) (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
iron-formation, banded iron formations, greenstone belts, volcanogenic massive sulfide deposits, Archean, Paleoproterozoic, mantle processes, tectonic setting, oceanic processes, biosphere

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