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Weathering in a world without terrestrial life recorded in the Mesoproterozoic Velkerri Formation

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  • Mehrnoush Rafiei

    (Macquarie University)

  • Martin Kennedy

    (Macquarie University)

Abstract

Today the terrestrial surface drives biogeochemical cycles on Earth through chemical weathering reactions mediated by the biological influence of soils. Prior to the expansion of life on to land, abiotic weathering may have resulted in different boundary conditions affecting the composition of the biosphere. Here we show a striking difference in weathering produced minerals preserved in the Mesoproterozoic Velkerri Formation. While the bulk chemistry and mineralogy is dominated by illite similar to many modern mudstones, application of a novel microbeam technology reveals that the initial detrital minerals were composed of mica (28%) and feldspar (45%) with only a trace amount (

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  • Mehrnoush Rafiei & Martin Kennedy, 2019. "Weathering in a world without terrestrial life recorded in the Mesoproterozoic Velkerri Formation," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-11421-4
    DOI: 10.1038/s41467-019-11421-4
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