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A crustal conductor on Eyre Peninsula, South Australia

Abstract

Short period variations in the geomagnetic field components were recorded in a closely spaced network of sites on southern Eyre Peninsula, South Australia. They reveal the existence of a linear zone of very good electrical conductivity within the late Archaean–early Proterozoic Gawler Craton. There is strong enhancement of the horizontal component variations transverse to the zone and an abrupt phase change in the vertical component, particularly for periods near 2×103s. These features are consistent with a line or narrow thin sheet of current flowing in a conductor at a depth 10 km; this almost certainly requires a major fracture or shear zone within the crystalline basement, for which there is supporting geophysical evidence. Superficial Cenozoic deposits blanket much of the area and consequently the basement geology is not known in detail, although there are structures parallel to the conductor 20 km to the east. Identification of a major linear crustal feature in such an area demonstrates the usefulness of geomagnetic variation studies for understanding deep geology.

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References

  1. White, A. & Polatajko, O. J. Geomagn. Geoelect. 30, 109–120 (1978).

    Article  ADS  Google Scholar 

  2. White, A. & Hopgood, D. N. J. Geomagn. Geoelect. 31, 479–484 (1979).

    Article  ADS  Google Scholar 

  3. Parkinson, W. D. Geophhys. J. R. astr. Soc. 2, 1–14 (1959).

    Article  ADS  Google Scholar 

  4. Schmucker, U. Bull. Scripps Inst. Oceanogr. 13, 1–165 (1970).

    Google Scholar 

  5. Thomson, B. P. (compiler) Geological map of South Australia (Department of Mines and Energy, Adelaide, 1980).

    Google Scholar 

  6. Parker, A. J. & Lemon, N. M. J. geol. Soc. Aust. 29, 221–238 (1982).

    Article  Google Scholar 

  7. Total Magnetic Intensity map South Australia 1: 2,000,000 (Department of Mines and Energy, Adelaide 1982).

  8. Gerdes, R. A. (compiler) Lincoln Bouguer anomaly map (Department of Mines and Energy, Adelaide, 1973).

    Google Scholar 

  9. Camfield, P. A., Gough, D. I. & Porath, H. Geophys. J. R. astr. Soc. 22, 201–221 (1971).

    Article  ADS  Google Scholar 

  10. Alabi, A. O., Camfield, P. A. & Gough, D. I. Geophys. J. R. astr. Soc. 43, 815–833 (1975).

    Article  ADS  Google Scholar 

  11. Camfield, P. A. & Gough, D. I. Can. J. Earth Sci. 14, 1229–1238 (1977).

    Article  ADS  Google Scholar 

  12. Niblett, E. R., De Laurier, J. M., Law, L. K. & Plet, F. C. J. Geomagn. Geoelect. 26, 203–221 (1974).

    Article  ADS  Google Scholar 

  13. Wilhjelm, J. & Friis-Christensen, E. J. Geomagn. Geoelect. 26, 173–189 (1974).

    Article  ADS  Google Scholar 

  14. Babour, K. et al. Geophys. J. R. astr. Soc. 45, 538–600 (1976).

    Article  Google Scholar 

  15. de Beer, J. H. & Gough, D. I. Geophys. J. R. astr. Soc. 63, 479–495 (1980).

    Article  ADS  Google Scholar 

  16. Nityananda, N. & Jayakumar, D. Phys. Earth planet. Inter. 27, 223–228 (1981).

    Article  ADS  Google Scholar 

  17. Shankland, T. J. & Duba, A. G. EOS 63, 438 (1982).

    Google Scholar 

  18. Shankland, R. J. & Ander, M. E. J. geophys. Res. 88, 9475–9484 (1983).

    Article  ADS  Google Scholar 

Download references

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White, A., Milligan, P. A crustal conductor on Eyre Peninsula, South Australia. Nature 310, 219–222 (1984). https://doi.org/10.1038/310219a0

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