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Oxygen-isotope evidence from ancient zircons for liquid water at the Earth's surface 4,300 Myr ago

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  • Stephen J. Mojzsis

    (University of California Los Angeles
    University of Colorado)

  • T. Mark Harrison

    (University of California Los Angeles)

  • Robert T. Pidgeon

    (Curtin University of Technology)

Abstract

Granitoid gneisses and supracrustal rocks that are 3,800–4,000 Myr old are the oldest recognized exposures of continental crust1. To obtain insight into conditions at the Earth's surface more than 4 Gyr ago requires the analysis of yet older rocks or their mineral remnants. Such an opportunity is presented by detrital zircons more than 4 Gyr old found within 3-Gyr-old quartzitic rocks in the Murchison District of Western Australia2,3. Here we report in situ U–Pb and oxygen isotope results for such zircons that place constraints on the age and composition of their sources and may therefore provide information about the nature of the Earth's early surface. We find that 3,910–4,280 Myr old zircons have oxygen isotope (δ18O) values ranging from 5.4 ± 0.6‰ to 15.0 ± 0.4‰. On the basis of these results, we postulate that the ∼4,300-Myr-old zircons formed from magmas containing a significant component of re-worked continental crust that formed in the presence of water near the Earth's surface. These data are therefore consistent with the presence of a hydrosphere interacting with the crust by 4,300 Myr ago.

Suggested Citation

  • Stephen J. Mojzsis & T. Mark Harrison & Robert T. Pidgeon, 2001. "Oxygen-isotope evidence from ancient zircons for liquid water at the Earth's surface 4,300 Myr ago," Nature, Nature, vol. 409(6817), pages 178-181, January.
    • Handle: RePEc:nat:nature:v:409:y:2001:i:6817:d:10.1038_35051557
    DOI: 10.1038/35051557
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    Cited by:

    1. Wriju Chowdhury & Dustin Trail & Martha Miller & Paul Savage, 2023. "Eoarchean and Hadean melts reveal arc-like trace element and isotopic signatures," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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