1887
Volume 31, Issue 1-2
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

Analyses of aeromagnetic and gravity data in the Cooper Basin area of South Australia, reveals varied basement lithologies and structure. Most of the observed magnetic responses arise from sources beneath the Cooper Basin sequence. A prominent northeast-trending structural basement grain is evident. Emplacement of a large igneous mass into the upper crust is interpreted beneath the Patchawarra Trough. Interpreted faulting along the southeastern edge of the igneous body resulted in up to 3.5 km of block uplift, coincident with the Gidgealpa and Merrimelia Ridges. A broad and prominent gravity low in the Nappamerri Trough region is attributed to Late Carboniferous Big Lake Suite granodiorite masses, which have intruded Warburton Basin strata. Intense gravity lows within the broader gravity low are attributed to granodiorite cupolas, which became non-tectonic palaeo-topographic highs during Cooper Basin deposition. Another broad gravity low in the Tenappera Trough region is due to a belt of Early Devonian granitoids that have intruded Proterozoic basement. A number of small magnetic anomalies, in the south of the survey, are interpreted as sourced from skarns above and adjacent to the granitoid intrusions. The only magnetic units above Proterozoic basement in the region are the basalts in the Warburton Basin sequence, which coincide with small magnetic anomalies. Depth to magnetic source modelling correlates well with the known depths of the basalts.

© 2000 ASEG
Loading

Article metrics loading...

/content/journals/10.1071/EG00024
2000-03-01
2026-01-14

  • From This Site

    /content/journals/10.1071/EG00024
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. Boucher, R.K., 1991, The tectonic framework of the Murteree Ridge, Warburton Basin: structural implications for the Cooper and Eromanga Basins: Honours thesis, Univ. of South Australia.
  2. Callen, R.A., Alley, N.F. and Greenwood, D.R., 1995, Lake Eyre Basin, in Drexel, J.F., and Preiss, W.V., Eds., Geology of South Australia, Volume 2, The Phanerozoic: South Australian Geological Survey, Bulletin, 54, 188-198.
  3. Campbell, I.H. and Griffiths, R.W., 1990, Implications of mantle plume structure for the evolution of flood basalts: Earth Planet. Sci. Lett., 81, 319-337.
  4. Clark, D.A., 1997, Magnetic petrophysics and magnetic petrology: aids to geological interpretation of magnetic surveys: AGSO J. Austral. Geol. Geophys., 17, 83-103.
  5. Direen, N.G., 1998, The Palaeozoic Koonenberry fold and thrust belt, western NSW: a case study in applied gravity and magnetic modelling: Expl. Geophys., 29, 330- 339.
  6. Edwards, A.C., 1980, The geology and petrology of the igneous rocks of Mt. Arrowsmith and related areas of north-western NSW: PhD. Thesis, Univ. of New South Wales.
  7. Frears, R.A. and Tucker, D.H., 1994, Cooper Basin aeromagnetic/radiometric test survey: South Australian Department of Mines and Energy, Report Book, 94/35.
  8. Gatehouse, C.G., 1986, The Geology of the Warburton Basin in South Australia: Austral. J. Earth Sci., 33, 161-180.
  9. Gatehouse, C.G., Fanning, C.M. and Flint, R.B., 1995, Geochronology of the Big Lake Suite, Warburton Basin, northeastern South Australia: Geological Survey of South Australia, Quarterly Geological Notes, 128, 8-16.
  10. Gow, P.A., Wall, V.J. and Valenta, R.K., 1993, The regional geophysical response of the Stuart Shelf, South Australia: Expl. Geophys., 24, 513-520.
  11. Gravestock, D.I., Callen, R.A., Alexander, E.M. and Hill, A.J., 1995, STRZELECKI map sheet: South Australian Geological Survey, Geological Atlas 1:250 000 Series, sheet SH54-2, Explanatory Notes.
  12. Gunn, P.J., 1997, Quantative methods for interpreting aeromagnetic data: a subjective view: AGSO J. Austral. Geol. Geophys., 17, 105-113.
  13. Gunn, P.J., Mitchell, J.N. and Meixner, A.J., 1996, The Structure and evolution of the Bass and Durroon Basins as delineated by aeromagnetic data: Australian Geological Survey Organisation, Record, 1996/14.
  14. Kivior, I. and Boyd, D., 1997, Interpretation of an aeromagnetic survey in the Cooper/Eromanga Basin: Archimedes Consulting Pty Ltd.
  15. Krieg, G.W., Alexander, E.M. and Rogers, P.A., 1995, Eromanga Basin, in Drexel, J.F. and Preiss, W.V., Eds., The geology of South Australia, Vol. 2, The Phanerozoic: South Australian Geological Survey, Bulletin, 54, 101-127.
  16. Meixner, A.J., Boucher, R.K., Yeates, A.N., Gunn, P.J., Richardson, L.M. and Frears, R.A., 1999, Interpretation of geophysical and geological data sets, Cooper Basin region, South Australia: Australian Geological Survey Organisation, Record, 1999/22.
  17. Murray, A.S., 1997, The Australian national gravity database: AGSO J. Austral. Geol. Geophys., 17, 145-155.
  18. Murray, C.G., 1986, Metallogeny of the Tasman Fold Belt System in Queensland: Ore Geol. Rev., 1, 315-400.
  19. Naudy, H., 1971, Automatic determination of depth on aeromagnetic profiles: Geophysics, 36, 717-722.
  20. O’Sullivan, P.B. and Kohn, B.P., 1997, Apatite fission track thermochronology of Tasmania: Australian Geological Survey Organisation, Record, 1997/35.
  21. Preiss, W.V., 1993, Neoproterozoic, in Drexel, J.F., Preiss, W.V. and Parker, A.J., Eds. Geology of South Australia, Vol. 1, The Precambrian: South Australian Geological Survey, Bulletin, 54, 171-204.
  22. Rankin, L.R. and Gatehouse, C.G., 1990, The northern margin of the Warburton Basin: Geological Survey of South Australia, Quarterly Geological Notes, 133, 14-17.
  23. Richardson, L.M., 1998, Innamicka - Strzelecki, SA Airborne Geophysical Survey, 1997, Operations Report: Australian Geological Survey Organisation, Record, 1998/10.
  24. Shi, Z. and Boyd, D., 1994, AutoMag - an automated method to estimate thickness of overburden from aeromagnetic profiles: Expl. Geophys., 24, 789-794.
  25. Thalhammer, O.A.R., Stevens, B.P.J, Gibson, J.H. and Grum, W., 1998, Tibooburra Granodiorite, western New South Wales: emplacement history and geochemistry: Austral. J. Earth Sci., 45, 775-787.
  26. Tucker, L.R., 1993, Magnetic susceptibility of Cooper and Warburton Basin sedimentary rocks - Pilot study: Department of Mines and Energy, South Australia, Report Book, 92/65.
  27. White, R.S., 1992, Magmatism during and after continental break-up, in Story, B.C., Alabaster, T. and Pankhurst, R.J. Eds., Magmatism and the Causes of Continental Break-up: Geol. Soc. London, Special Publ., 68, 1-16.
/content/journals/10.1071/EG00024
Loading
  • Article Type: Research Article
Keyword(s): aeromagnetic interpretation; Cooper Basin; gravity interpretation; magnetic-source modelling; Warburton Basin

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error