publication . Article . 2019

Microbially induced potassium enrichment in Paleoproterozoic shales and implications for reverse weathering on early Earth

Aubineau, Jérémie; El Albani, Abderrazak; Bekker, Andrey; Somogyi, Andrea; Bankole, Olabode M.; Macchiarelli, Roberto; Meunier, Alain; Riboulleau, Armelle; Reynaud, Jean-Yves; Konhauser, Kurt O.;
Open Access English
  • Published: 01 Jun 2019 Journal: Nature Communications, volume 10 (issn: 2041-1723, eissn: 2041-1723, Copyright policy)
  • Publisher: Nature Publishing Group UK
Abstract
International audience; Illitisation requires potassium incorporation into a smectite precursor, a process akin to reverse weathering. However, it remains unclear whether microbes facilitate K+ uptake to the sediments and whether illitisation was important in the geological past. The 2.1 billion-year-old Francevillian Series of Gabon has been shown to host mat-related structures (MRS) and, in this regard, these rocks offer a unique opportunity to test whether ancient microbes induced illitisation. Here, we show high K content confined to illite particles that are abundant in the facies bearing MRS, but not in the host sandstone and black shale. This observation ...
Subjects
free text keywords: Sedimentology, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, Q, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, Geochemistry, Science, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, Palaeontology, Article

Additional information Supplementary Information accompanies this paper at https://doi.org/10.1038/s41467- 019-10620-3.

Abstract
International audience; Illitisation requires potassium incorporation into a smectite precursor, a process akin to reverse weathering. However, it remains unclear whether microbes facilitate K+ uptake to the sediments and whether illitisation was important in the geological past. The 2.1 billion-year-old Francevillian Series of Gabon has been shown to host mat-related structures (MRS) and, in this regard, these rocks offer a unique opportunity to test whether ancient microbes induced illitisation. Here, we show high K content confined to illite particles that are abundant in the facies bearing MRS, but not in the host sandstone and black shale. This observation ...
Subjects
free text keywords: Sedimentology, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, Q, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, Geochemistry, Science, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, Palaeontology, Article

Additional information Supplementary Information accompanies this paper at https://doi.org/10.1038/s41467- 019-10620-3.

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publication . Article . 2019

Microbially induced potassium enrichment in Paleoproterozoic shales and implications for reverse weathering on early Earth

Aubineau, Jérémie; El Albani, Abderrazak; Bekker, Andrey; Somogyi, Andrea; Bankole, Olabode M.; Macchiarelli, Roberto; Meunier, Alain; Riboulleau, Armelle; Reynaud, Jean-Yves; Konhauser, Kurt O.;