Abstract
Large igneous province volcanism represents extensive mantle melting that has contributed to Earth’s chemical differentiation and lithospheric and climatic changes. Compositional heterogeneities in the mantle, such as accumulated recycled crust, may make key contributions to large igneous province activity. One class of rocks capable of producing distinctive mantle heterogeneities is the iron formations, uniquely dense Fe-rich sedimentary rocks formed in Earth’s early oceans. Although numerous iron formations were preserved on continents, with some becoming major Fe ore deposits, large amounts of iron formations may also have been recycled into the mantle, with uncertain consequences. Here we use statistical analysis of time series to show that from 3,200 to 1,000 Myr ago, most iron formation deposition ages are correlated with large igneous province activity 241 ± 15 Myr later, and that these events are coupled on long timescales. Linking observations from tectonics, geodynamics, mineral physics and seismology studies, we hypothesize that dense accumulations of subducted iron formations can form highly conductive Fe-rich zones in the lowermost mantle and facilitate the formation of thermal anomalies that produce mantle plume upwellings, and, ultimately, large igneous provinces. Although uncertainties remain regarding the precise nature of Archaean and Proterozoic convergent tectonics, facilitation of large igneous province activity by subducted iron formations would link Earth’s ocean chemistry to the pace of heat flow, crustal production and chemical differentiation.
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Data availability
All data necessary to reproduce the results of this work are given in the Extended Data and Source Data. Copies of this information, along with the computer code used to generate results and figures, are available from the Zenodo online data repository at https://doi.org/10.5281/zenodo.7843152. Source data are provided with this paper.
Code availability
The computer code used to generate results and figures is available from the Zenodo online data repository at https://doi.org/10.5281/zenodo.7843152.
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Acknowledgements
We thank M. Krause, K.K.M. Lee, J.K. Gaison, A. Keller and D.A. Keller for discussions. D.S.K., C.-T.A.L. and R.D. received support from NASA grant 80NSSC18K0828. L.J.R. acknowledges support from a Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant (RGPIN-2021-02523).
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D.S.K., S.T. and L.J.R. developed the project. D.S.K. and S.T. conducted time series analysis and D.S.K. conducted tests for statistical significance and Fourier transform analysis. All authors discussed calculations and numerical modelling, which were performed by D.S.K. All authors discussed interpretations of results and their implications. D.S.K. wrote the initial manuscript draft, which all authors discussed and edited together.
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Extended data
Extended Data Fig. 1 Simplified model of conductive heat flow through IF in the lowermost mantle.
(a): Model setup of IF and D″ mantle at the CMB. IF is taken as 50% Fe-oxides and 50% SiO2 by volume. (b): Model results showing the fraction of heat flow through the IF box for a range of IF thermal conductivities. The thermal conductivity of both D″ mantle and SiO2 in IF are taken to be 10 W m−1K−1 (ref. 2).
Extended Data Fig. 2 Simplified calculations showing that the sum of subducted IF mass would likely fit within a layer ≤4 km thick above the CMB.
If IFs persist in the lowermost mantle, they might remain seismically undetectable with the current resolution limitations of ~5 km above the CMB (ref. 16) in the absence of vertical deformation.
Supplementary information
Supplementary Table 1
Table showing correlations of each IF with each ELIP and the total number of events falling within several age correlation groupings.
Source data
Source Data Fig. 1
All ELIP and IF data plotted in Fig. 1 and the statistical analyses of these data and the synthetic data to which they are compared.
Source Data Fig. 2
ELIP and IF time series used in discrete Fourier transform analysis.
Source Data Extended Data Fig. 1
Calculations and data used to make Extended Data Fig. 1.
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Keller, D.S., Tassara, S., Robbins, L.J. et al. Links between large igneous province volcanism and subducted iron formations. Nat. Geosci. 16, 527–533 (2023). https://doi.org/10.1038/s41561-023-01188-1
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DOI: https://doi.org/10.1038/s41561-023-01188-1