1887
ASEG2012 - 22nd Geophysical Conference
  • ISSN: 2202-0586
  • E-ISSN:

Abstract

Summary

Magnetotelluric (MT) techniques measure natural time variations of the Earth’s magnetic and electric fields to infer subsurface electrical conductivity structure. Data are collected over a range of frequencies, providing insights into how this structure varies with depth. Depending on the Earth conductivity and frequencies used, information can be obtained from the near surface to depths of hundreds of kilometres.

MT surveying has been used in a wide variety of geological scenarios, from investigations of continentalscale structures to mineral and geothermal exploration, and in the search for ground-water, and many such surveys have now been undertaken in South Australia. Recently, surveys have been conducted by Geoscience Australia (GA) under the Australian Government’s Onshore Energy Security Program (OESP) along deep crustal seismic reflection transects, in part in collaboration with the University of Adelaide (UA), the Geological Survey of South Australia, Primary Industry and Resources South Australia (GSSA, PIRSA) and the Australian National Seismic Imaging Resource (ANSIR) across the Gawler Craton and Curnamona Province. Given the wide range of applications for MT data, it is proposed to deliver these data online as industry-standard electrical data interchange (EDI) files, starting with the most modern datasets.

This paper presents an overview of the MT data and reports presently available for South Australia. All MT data are available for download online from the South Australian Resources Information Geoserver (SARIG), and both seismic and MT data acquired by GA and collaborators under the OESP are available for download from the GA web site.

© 2012 ASEG
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2012-12-01
2026-01-22

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References

  1. Adam, H., 2007, A magnetotelluric survey of the Broken Hill and Olary domains: Honours Report, University of Adelaide.
  2. Chamalaun, F.H., 1986, Extension of the Flinders ranges anomaly: Exploration Geophysics, 17, 31.
  3. Constable, S., Orange, A.S., Michael Hoversten, G. and Frank Morrison, H., 1998, Marine magnetotellurics for petroleum exploration Part 1: A sea-floor equipment system: Geophysics, 63(3), 816-825.
  4. Craven, E., 2009, Crustal imaging of prospective geothermal basins using magnetotellurics: a case study of the Renmark Trough in South Australia: Honours Thesis, University of Adelaide.
  5. Dhu, T., Milligan, P.R., Curnow, S., Adam, H., Fomin, T., Craven, E., Thiel, S. and Heinson, G., 2010, Magnetotelluric survey along the east-west Southern Flinders Ranges seismic traverse, South Australia: Geological Society of Australia, 2010 Australian Earth Sciences Convention (AESC), Earth systems: change, sustainability, vulnerability, Abstract No 98 of the 20th Australian Geological Convention, National Convention Centre, Canberra, Australian Capital Territory, July 4-8, 288.
  6. Duan, J., Milligan, P.R., Nakamura, A., Fomin, T., Maher, J., Heinson, G., Thiel, S. and Dhu, T., 2010a, Magnetotelluric acquisition along deep seismic reflection transects in Australia. In: International Union of Geodesy and Geophysics, IUGG XXV General Assembly, Abstract.
  7. Duan, J., Milligan, P.R. and Nakamura, A., 2010b, Magnetotelluric survey along the GOMA deep seismic reflection transect in the northern Gawler Craton to Musgrave Province, South Australia, In: Korsch, R. J. and Kositcin, N., editors, GOMA (Gawler Craton-Officer Basin-Musgrave Province-Amadeus Basin) Seismic and MT Workshop 2010: Geoscience Australia, Record, 2010/39, 7-15.
  8. Geoscience Australia, 2011, Energy Security Program Achievements –― Towards Future Energy Discovery.
  9. Goleby, B.R., Korsch, R.J., Fomin, T., Conor, C.H.H., Preiss, W.V., Robertson, R.S. and Burtt, A.C., 2006, The 2003-2004 Curnamona Province Seismic Survey, Geoscience Australia Record 2006/12.
  10. Gough, D. I., Lilley, F.E.M. and McElhinny, M.W., 1972, A polarization-sensitive magnetic variation anomaly in South Australia: Natural Physical Science, 239, 88-91.
  11. Heinson, G. S., Direen, N.G. and Gill, R.M., 2006, Magnetotelluric evidence for a deep-crustal mineralizing system beneath the Olympic Dam iron oxide copper-gold deposit, southern Australia: Geology 34(7), 573-576.
  12. Jones, A. G. 1999, Imaging the continental upper mantle using electromagnetic methods: Lithos 48, 24-81.
  13. Key, K. W., Constable, S.C. and Weiss, C.J, 2006, Mapping 3D salt using the 2D marine magnetotelluric method: Case study from Gemini Prospect, Gulf of Mexico: Geophysics 71(1), B17-B27.
  14. Kusi, R., White, A., Heinson, G. and Milligan, P., 1998, Electromagnetic induction studies in the Eyre Peninsula, South Australia: Geophysical Journal International, 132, 687- 700.
  15. Lilley, F. E. M. and Tammemagi, H. Y., 1972, Magnetotelluric and geomagnetic depth sounding methods compared: Natural Physical Science, 240, 184-187.
  16. Maier, R., Heinson, G., Thiel, S., Selway, K., Gill, R. and Scroggs, M., 2007, A 3D lithospheric electrical resistivity model of the Gawler Craton, Southern Australia: Applied Earth Science (Trans. Inst. Min. Metall. B), 116(1), 13-21.
  17. Milligan, P.R. and Lilley, F.E.M., 2010, Magnetotelluric results along the N-S Curnamona seismic traverse to the east of lake Frome, South Australia, ASEG Extended Abstracts, 4pp.
  18. Meju, M. A., 2002, Geoelectromagnetic exploration for natural resources: models, case studies and challenges: Surveys in Geophysics, 23, 73-206.
  19. Moradzadeh, A., 1998, Electrical imaging of the Adelaide geosyncline using magnetotellurics (MT): PhD Manuscript, Flinders University.
  20. Popkov, I., White, A., Heinson, g., Constable, S., Milligan, P. and Lilley, F. E. M., Electromagnetic investigation of the Eyre Peninsula conductivity anomaly: Exploration Geophysics, 31, 187-199.
  21. Selway, K. M., Hand, M., Payne, J. L., Heinson, G. S. and Reid, A., 2011, Magnetotelluric constraints on the tectonic setting of Grenville-aged orogenesis in central Australia: Journal of the Geological Society, London, 168, 251-264.
  22. Thiel, S. and Heinson, G., 2010, Crustal imaging of a mobile bel using magnetotellurics: An example of the Fowler Domain in South Australia: Journal of Geophysical Research, 115, B06102.
  23. Thiel, S., Heinson, G. and White, A., 2005, Tectonic evolution of the southern Gawler Craton, South Australia, from electromagnetic sounding: Australian Journal of Earth Sciences, 52, 887-896.
  24. Thiel, S., Milligan, P. R., Heinson, G., Boren, G., Duan, J., Ross, J., Adam, H., Dhu, T., Fomin, T., Craven, E. and Curnow, S., 2010a, Magnetotelluric acquisition and processing, with examples from the Gawler Craton, Curnamona Province and Curnamona-Gawler Link transects in South Australia, In: Korsch, R. J. and Kositcin, N., editors, South Australian Seismic and MT Workshop 2010: Geoscience Australia, Record, 2010/10, 11-22.
  25. Thiel,S., Heinson, G., Milligan, P.R., Boren, G. and Duan, J., 2010b, Magnetotelluric survey across the central Eyre Peninsula: ASEG Extended Abstracts, 1pp.
  26. Thiel, S., Heinson, G., Milligan, P.R., Boren, G. and Duan, J., 2010c, Crustal structure of the central Eyre Peninsula, South Australia, defined from magnetotellurics: In:IAGA WG 1.2 20th Workshop on Electromagnetic Induction in the Earth, Extended Abstracts, Giza, Egypt.
  27. Tuncer, V., Unsworth, M. J., Siripunvaraporn, W., and Craven, J. A., 2006, Exploration for unconformity-type uranium deposits with audiomagnetotelluric data: A case study from the McArthur River mine, Saskatchewan, Canada: Geophysics, 71(6), B201-B210.
  28. Vozoff, K., 1972, The magnetotelluric method in the exploration of sedimentary basins: Geophysics, 37(1), 98-142.
  29. Wang, L.J. and Chamalaun, F.H., 1995, A magnetotelluric traverse across the Adelaide Geosyncline: Exploration Geophysics, 26, 539-546.
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  • Article Type: Research Article
Keyword(s): magnetotellurics; online delivery.; South Australia

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