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Reassessing the evidence for the earliest traces of life

Author

Listed:
  • Mark A. van Zuilen

    (University of California, San Diego)

  • Aivo Lepland

    (Geological Survey of Norway
    Tallinn Technical University)

  • Gustaf Arrhenius

    (University of California, San Diego)

Abstract

The isotopic composition of graphite is commonly used as a biomarker in the oldest (>3.5 Gyr ago) highly metamorphosed terrestrial rocks. Earlier studies on isotopic characteristics of graphite occurring in rocks of the approximately 3.8-Gyr-old Isua supracrustal belt (ISB) in southern West Greenland have suggested the presence of a vast microbial ecosystem in the early Archean1,2,3,4. This interpretation, however, has to be approached with extreme care5. Here we show that graphite occurs abundantly in secondary carbonate veins in the ISB that are formed at depth in the crust by injection of hot fluids reacting with older crustal rocks (metasomatism). During these reactions, graphite forms from the disproportionation of Fe(II)-bearing carbonates at high temperature. These metasomatic rocks, which clearly lack biological relevance, were earlier thought to be of sedimentary origin and their graphite association provided the basis for inferences about early life1,2,3,4. The new observations thus call for a reassessment of previously presented evidence for ancient traces of life in the highly metamorphosed Early Archaean rock record.

Suggested Citation

  • Mark A. van Zuilen & Aivo Lepland & Gustaf Arrhenius, 2002. "Reassessing the evidence for the earliest traces of life," Nature, Nature, vol. 418(6898), pages 627-630, August.
    • Handle: RePEc:nat:nature:v:418:y:2002:i:6898:d:10.1038_nature00934
    DOI: 10.1038/nature00934
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    Cited by:

    1. Zixiao Guo & Dominic Papineau & Jonathan O’Neil & Hanika Rizo & Zhong-Qiang Chen & Xincheng Qiu & Zhenbing She, 2024. "Abiotic synthesis of graphitic carbons in the Eoarchean Saglek-Hebron metasedimentary rocks," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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