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Filamentous microfossils in a 3,235-million-year-old volcanogenic massive sulphide deposit

Nature volume 405, pages 676–679 (2000)Cite this article

Abstract

The record of Archaean microfossils is sparse1. Of the few bona fide fossil assemblages, most are from shallow-water settings, and they are typically associated with laminated, stromatolitic sedimentary rocks2,3,4. Microfossils from deep-sea hydrothermal systems have not been reported in Precambrian rocks (> 544 million years old), although thermophilic microbes are ubiquitous in modern sea-floor hydrothermal settings5,6, and apparently have the most ancient lineages7,8. Here, I report the discovery of pyritic filaments, the probable fossil remains of thread-like microorganisms, in a 3,235-million-year-old deep-sea volcanogenic massive sulphide deposit from the Pilbara Craton of Australia. From their mode of occurrence, the micro-organisms were probably thermophilic chemotropic prokaryotes, which inhabited sub-sea-floor hydrothermal environments. They represent the first fossil evidence for microbial life in a Precambrian submarine thermal spring system, and extend the known range of submarine hydrothermal biota by more than 2,700 million years9. Such environments may have hosted the first living systems on Earth, consistent with proposals for a thermophilic origin of life10,11,12,13.

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Figure 1: Location and geology of the Sulphur Springs deposit.
Figure 2: Remnant cores and bands containing filaments.
Figure 3: Photomicrographs of filaments from the Sulphur Springs VMS deposit.
Figure 4

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Acknowledgements

I thank T. S. Blake, R. Buick and S. Sheppard for comments and discussion; M. G. Doepel and P. Morant for access to samples; and J. Backhouse, B. David, M. G. Doyle, G. L. England, S. Folkert, P. Morant, S. Reverts, S. Richter and K.-H. Wyrwoll for assistance. This work was supported by an ARC fellowship.

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  1. Department of Geology and Geophysics, University of Western Australia, Nedlands, 6907, Western Australia, Australia

    Birger Rasmussen

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Correspondence to Birger Rasmussen.

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Rasmussen, B. Filamentous microfossils in a 3,235-million-year-old volcanogenic massive sulphide deposit. Nature 405, 676–679 (2000). https://doi.org/10.1038/35015063

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