Skip to Main content Skip to Navigation
New interface
Journal articles

Microbially influenced formation of 2,724-million-year-old stromatolites

Abstract : Laminated accretionary carbonate structures known as stromatolites are a prominent feature of the sedimentary record over the past 3,500Myr (ref. 1). The macroscopic similarity to modern microbial structures has led to the inference that these structures represent evidence of ancient life. However, as Archaean stromatolites only rarely contain microfossils, the possibility of abiogenic origins has been raised. Here, we present the results of nanoscale studies of the 2,724-Myr-old stromatolites from the Tumbiana Formation (Fortescue Group, Australia) showing organic globule clusters within the thin layers of the stromatolites. Aragonite nanocrystals are also closely associated with the organic globules, a combination that is remarkably similar to the organo-mineral building blocks of modern stromatolites. Our results support microbial mediation for the formation of the Tumbiana stromatolites, and extend the geologic record of primary aragonite by more than 2,300Myr (ref. 6).
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03603735
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Thursday, March 10, 2022 - 9:50:17 AM
Last modification on : Friday, October 21, 2022 - 3:32:40 PM

Identifiers

Citation

Kevin Lepot, Karim Benzerara, Gordon E. Brown, Pascal Philippot. Microbially influenced formation of 2,724-million-year-old stromatolites. Nature Geoscience, 2008, 1, pp.118-121. ⟨10.1038/ngeo107⟩. ⟨insu-03603735⟩

Share

Metrics

Record views

9