Banded iron formations are critical to track changes in Archaean to Palaeoproterozoic ocean chemistry, with deposition triggered by water column iron oxidation. Recently, however, it was suggested that reduced iron minerals were the primary precipitates, and these were subsequently oxidized by oxygen-bearing groundwater. If true, this would cast doubt on our understanding of how banded iron formations were deposited and their ability to record early ocean chemistry. Here we present a hydrogeological box model, based on the approximately 2.5 billion year old Hamersley Basin of Western Australia, developed to evaluate the plausibility of secondary iron oxidation. The box model calculates the time required for groundwater to flux enough oxygen through the basin to oxidize a given amount of ferrous iron. Less than 9% of nearly four million model iterations returned oxidation times less than the age of the basin. Successful simulations required simultaneously steep hydraulic gradients, high permeability and elevated oxygen concentrations. Our simulations show that the postdepositional oxidation of large banded iron formations is unlikely, except on a limited scale (that is, during secondary ore formation), and that oxidized iron phases were probably the precursor to large Palaeoproterozoic banded iron formations.
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All data supporting this study are included in the manuscript and Supplementary Information.
The customized MATLAB code used for the hydrogeological box model calculations is available in the Supplementary Information. The equations and values that underlie the calculations are described in detail in Methods.
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Beukes, N. J. & Gutzmer, J. Origin and paleoenvironmental significance of major iron formations at the Archean–Paleoproterozoic boundary. SEG Rev. 15, 5–47 (2008).
Bekker, A. et al. in Sediments, Diagenesis and Sedimentary Rocks 2nd edn (ed. Mackenzie, F. T.) 561–628 (Elsevier, 2014).
Trendall, A. F. & Blockley, J. G. The iron formations of the Precambrian Hamersley Group Western Australia with special reference to the associated crocidolite. Geol. Surv. West. Aust. Bull. 119, 1–366 (1970).
Morris, R. Genetic modelling for banded iron-formation of the Hamersley Group, Pilbara Craton, Western Australia. Precambrian Res. 60, 243–286 (1993).
Konhauser, K. O. et al. Aerobic bacterial pyrite oxidation and acid rock drainage during the Great Oxidation Event. Nature 478, 369–373 (2011).
Gumsley, A. P. et al. Timing and tempo of the Great Oxidation Event. Proc. Natl Acad. Sci. USA 114, 1811–1816 (2017).
Farquhar, J., Zerkle, A. L. & Bekker, A. Geological constraints on the origin of oxygenic photosynthesis. Photosynth. Res. 107, 11–36 (2011).
Cloud, P. E. Significance of the Gunflint (Precambrian) microflora. Science 148, 27–35 (1965).
Konhauser, K. O. et al. Could bacteria have formed the Precambrian banded iron formations? Geology 30, 1079–1082 (2002).
Posth, N. R., Canfield, D. E. & Kappler, A. Biogenic Fe(iii) minerals: from formation to diagenesis and preservation in the rock record. Earth Sci. Rev. 135, 103–121 (2014).
Konhauser, K. O. et al. Iron formations: a global record of Neoarchaean to Palaeoproterozoic environmental history. Earth Sci. Rev. 172, 140–177 (2017).
Rasmussen, B., Krapez, B. & Meier, D. B. Replacement origin for hematite in 2.5 Ga banded iron formation: evidence for postdepositional oxidation of iron-bearing minerals. Geol. Soc. Am. Bull. 126, 438–446 (2014).
Rasmussen, B., Muhling, J. R., Suvorova, A. & Krapez, B. Dust to dust: evidence for the formation of ‘primary’ hematite dust in banded iron formations via oxidation of iron silicate nanoparticles. Precambrian Res. 284, 49–63 (2016).
Rasmussen, B., Muhling, J. R., Suvorova, A. & Krapez, B. Greenalite precipitation linked to the deposition of banded iron formations downslope from a late Archean carbonate platform. Precambrian Res. 290, 49–62 (2017).
Johnson, J. E., Muhling, J. R., Cosmidis, J., Rasmussen, B. & Templeton, A. S. Low-Fe(iii) greenalite was a primary mineral from Neoarchean oceans. Geophys. Res. Lett. 45, 3182–3192 (2018).
Konhauser, K. O. et al. Oceanic nickel depletion and a methanogen famine before the Great Oxidation Event. Nature 458, 750–753 (2009).
Planavsky, N. J. et al. The evolution of the marine phosphate reservoir. Nature 467, 1088–1090 (2010).
Konhauser, K. O. et al. Phytoplankton contributions to the trace-element composition of Precambrian banded iron formations. Geol. Soc. Am. Bull. 130, 941–951 (2018).
Brown, M. C., Oliver, N. & Dickens, G. R. Veins and hydrothermal fluid flow in the Mt. Whaleback iron ore district, eastern Hamersley Province, Western Australia. Geochim. Cosmochim. Acta. 128, 441–474 (2004).
Schmidt, P. W. & Clark, D. A. Palaeomagnetism and magnetic anisotropy of Proterozoic banded-iron formations and iron ores of the Hamersley Basin, Western Australia. Precambrian Res. 69, 133–155 (1994).
Tompkins, L. A. & Cowan, D. R. Opaque mineralogy and magnetic properties of selected banded iron‐formations, Hamersley Basin, Western Australia. Aust. J. Earth Sci. 48, 427–437 (2010).
Alibert, C. & McCulloch, M. Rare earth element and neodymium isotopic compositions of the banded iron-formations and associated shales from Hamersley, Western Australia. Geochim. Cosmochim. Acta 57, 187–204 (1993).
Rasmussen, B., Fletcher, I. R. & Sheppard, S. Isotopic dating of the migration of a low-grade metamorphic front during orogenesis. Geology 33, 773–776 (2005).
Rasmussen, B., Fletcher, I., Muhling, J., Thorne, W. & Broadbent, G. Prolonged history of episodic fluid flow in giant hematite ore bodies: evidence from in situ U–Pb geochronology of hydrothermal xenotime. Earth Planet. Sci. Lett. 258, 249–259 (2007).
Warchola, T. et al. Petrology and geochemistry of the Boolgeeda Iron Formation, Hamersley Basin, Western Australia. Precambrian Res. 316, 155–173 (2018).
Freeze, R. A. & Cherry, J. A. Groundwater (Prentice-Hall, 1979).
Adams, J. J., Rostron, B. J. & Mendoza, C. A. Coupled fluid flow, heat and mass transport, and erosion in the Alberta basin: implications for the origin of the Athabasca oil sands. Can. J. Earth Sci. 41, 1077–1095 (2004).
Powell, C. M., Oliver, N. H. S., Li, Z.-X., Martin, D. M. & Ronaszeki, J. Synorogenic hydrothermal origin for giant Hamersley iron oxide ore bodies. Geology 27, 175–178 (1999).
McLellan, J. G., Oliver, N. H. S. & Schaubs, P. M. Fluid flow in extensional environments; numerical modelling with an application to Hamersley iron ores. J. Struct. Geol. 26, 1157–1171 (2004).
Ge, S., & Garven, G. in Origin and Evolution of Sedimentary Basins and their Energy and Mineral Resources (ed. Price, R. A.) 145–157 (AGU, 1989).
Ge, S. & Garven, G. Hydromechanical modeling of tectonically driven groundwater flow with application to the Arkoma Foreland Basin. J. Geophys. Res. 97, 9119–9144 (1992).
Ge, S. & Garven, G. A theoretical model for thrust-induced deep groundwater expulsion with application to the Canadian Rocky Mountains. J. Geophys. Res. 99, 13851–13868 (1994).
Haugaard, R., Pecoits, E., Lalonde, S. V., Rouxel, O. J. & Konhauser, K. O. The Joffre banded iron formation, Hamersley Group, Western Australia: Assessing the palaeoenvironment through detailed petrology and chemostratigraphy. Precambrian Res. 273, 12–37 (2016).
Lyons, T. W., Reinhard, C. T. & Planavsky, N. J. The rise of oxygen in Earth’s early ocean and atmosphere. Nature 506, 307–315 (2014).
Canfield, D. E. et al. Pathways of organic carbon oxidation in three continental margin sediments. Mar. Geol. 113, 27–40 (1993).
Becking, L. & Kaplan, I. R. Limits of the natural environment in terms of pH and oxidation–reduction potentials. J. Geol. 68, 243–284 (1960).
Poulton, S. W. & Canfield, D. E. Ferruginous conditions: a dominant feature of the ocean through Earth’s history. Elements 7, 107–112 (2011).
Planavsky, N. et al. Rare earth element and yttrium compositions of Archean and Paleoproterozoic Fe formations revisited: new perspectives on the significance and mechanisms of deposition. Geochim. Cosmochim. Acta 74, 6387–6405 (2010).
Smith, A. J. B. & Beukes, N. J. Paleoproterozoic banded iron formation-hosted high grade hematite iron ore deposits of Transvaal Supergroup, South Africa. Episodes 39, 269–284 (2016).
Van Kranendonk, M. J. & Mazumder, R. Two Paleoproterozoic glacio-eustatic cycles in the Turee Creek Group, Western Australia. Geol. Soc. Am. Bull. 127, 596–607 (2015).
Trendall, A. F. Progress report on the Brockman Iron Formation in the Wittenoom-Yampire Area. West. Aust. Geol. Surv. Ann. Rep. 1964, 55–65 (1964).
Bau, M. Effects of syn- and post-depositional processes on the rare-earth element distribution in Precambrian iron-formations. Eur. J. Mineral. 5, 257–267 (1993).
Johnson, C. M., Beard, B. L., Klein, C., Beukes, N. J. & Roden, E. E. Iron isotopes constrain biologic and abiologic processes in banded iron formation genesis. Geochim. Cosmochim. Acta 72, 151–169 (2008).
Steinhoefel, G. et al. Deciphering formation processes of banded iron formations from the Transvaal and the Hamersley successions by combined Si and Fe isotope analysis using UV femtosecond laser ablation. Geochim. Cosmochim. Acta 74, 2677–2696 (2010).
Percak-Dennett, E. M. et al. Iron isotope fractionation during microbial dissimilatory iron oxide reduction in simulated Archaean seawater. Geobiology 9, 205–220 (2011).
Fischer, W. & Knoll, A. H. An iron shuttle for deepwater silica in Late Archean and early Paleoproterozoic iron formation. Geol. Soc. Am. Bull. 121, 222–235 (2009).
Li, W., Beard, B. L. & Johnson, C. M. Biologically recycled continental iron is a major component in banded iron formations. Proc. Natl Acad. Sci. USA 112, 8193–8198 (2015).
Isson, T. T. & Planavsky, N. J. Reverse weathering as a long-term stabilizer of marine pH and planetary climate. Nature 560, 471–475 (2018).
Beukes, N. Sedimentology of the Kuruman and Griquatown iron-formations, Transvaal supergroup, Griqualand West, South Africa. Precambrian Res. 24, 47–84 (1984).
Sander, R. Compilation of Henry’s Law Constants for Inorganic and Organic Species of Potential Importance in Environmental Chemistry (Max-Planck Institute of Chemistry, 1999).
Klein, C. & Beukes, N. J. in The Proterozoic Biosphere (eds Schopf, J. W. & Klein, C.) 139–146 (Cambridge Univ. Press, 1992).
L.J.R. acknowledges a NSERC Vanier Canada Graduate Scholarship and T.J.W. a NSERC CGS-M. This work was supported by NSERC Discovery Grants to K.O.K. (RGPIN-165831) and D.S.A. (RGPIN-04134). N. MacPherson and W. Hao are thanked for thoughtful discussions and input on an early draft.