Ion microprobe identification of 4,100–4,200 Myr-old terrestrial zircons (original) (raw)

Nature volume 304, pages 616–618 (1983) Cite this article

Abstract

We report here the existence of detrital zircons from Western Australia which are far older than any known terrestrial rocks. They are from quartzites at Mt Narryer (Fig. 1), a locality which has created interest because of the nearby occurrence of 3,630±40 Myr orthogneisses1. The older zircons were discovered during reconnaissance U–Pb age determinations of zircon concentrates from Archaean metasediments, using the ion microprobe SHRIMP2,3 at the Australian National University. These determinations are being made specifically to search for zircons having ages in the interval 3,800–4,500 Myr, a period unrepresented so far by reliable terrestrial age determinations. Grain-by-grain measurements of one particular concentrate revealed four zircons (Fig. 2) having near-concordant U–Pb ages between 4,100 and 4,200 Myr, in striking contrast to most grains whose ages are ∼3,750 and ∼3,500 Myr. These results show that pre-3,800 Myr silica-saturated rocks were indeed present on the Earth's crust.

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References

  1. DeLaeter, J. R. et al. Nature 292, 322–324 (1981).
    Article ADS CAS Google Scholar
  2. Clement, S. W. J., Compston, W. & Newstead, G. Proc. int. S.I.M.S. Conf., Meunster (ed. Benninghoven, A. ) (Springer, Berlin, 1977).
    Google Scholar
  3. Compston, W., Williams, I. S. & Clement, S. W. J. Proc. 30th Am. Soc. Mass Spectrom. Conf. Honolulu, 593–595 (Am. Soc. Mass Spectrom., 1982).
    Google Scholar
  4. Williams, I. R., Walker, I. W., Hocking, R. M. & Williams, S. J. Geol. Surv. Western Australia Rec. 5 (1980).
    Google Scholar
  5. Coles, J. W. N., Compston, W. & Foster, J. J. Research School of Earth Sciences, AMU., A. Rep., 175–179 (1980).
  6. Compston, W., Williams, I. S. & Meyer, C. Proc. 14th Lunar Sci. Conf. (in the press).
  7. Baadsgaard, H. et al. Earth planet. Sci. Lett. (in the press).

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Authors and Affiliations

  1. Research School of Earth Sciences, The Australian National University, GPO Box 4, Canberra, A.C.T., 2601, Australia
    D. O. Froude, T. R. Ireland, P. D. Kinny, I. S. Williams & W. Compston
  2. Geological Survey of Western Australia, 66 Adelaide Terrace, Perth, Western Australia, 6000, Australia
    I. R. Williams & J. S. Myers

Authors

  1. D. O. Froude
  2. T. R. Ireland
  3. P. D. Kinny
  4. I. S. Williams
  5. W. Compston
  6. I. R. Williams
  7. J. S. Myers

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Froude, D., Ireland, T., Kinny, P. et al. Ion microprobe identification of 4,100–4,200 Myr-old terrestrial zircons.Nature 304, 616–618 (1983). https://doi.org/10.1038/304616a0

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