1887
Volume 23, Issue 1-2
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

Using gravity and magnetic anomalies, I infer a regional geological framework for north Queensland. In the west are two almost-collinear, north-striking Proterozoic crustal rifts, each about 700 km long and 100 to 250 km wide, but with different geophysical anomaly patterns. The Mount Isa Geophysical Domain is the southern rift. These rifts are thought to be younger than most adjacent crust. To the east of these rifts the Proterozoic crust is of two types, magnetic and non-magnetic. Non-magnetic crust has lower amplitude magnetic anomalies at both short (< 3 km) and long wavelength. Basement of this type crops out only in the Croydon area. Magnetic crust is generally to the east, adjacent to the margin of the exposed Proterozoic crust, and it is extensively exposed in inliers. The magnetic and nonmagnetic Proterozoic crust originally had the same magnetization. Proterozoic and Palaeozoic thermal events/deformation subsequently magnetized the margin of the Proterozoic crust. The Palaeozoic crust along the southern margin of north Queensland can be subdivided into geophysical domains. The margins of these geophysical domains have similar geophysical anomalies to the margin of the Proterozoic crust to the north.

© 1992 ASEG
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1992-03-01
2026-01-19

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References

  1. Bain, J. H. C., Withnall, I. W., Oversby, B. S., and Mackenzie, D, E. (1990). ‘North Queensland Proterozoic inliers and Palaeozoic igneous provinces — regional geology and mineral deposits.’ In Hughes, F. E. (ed.), Geology of the Mineral Deposits of Australia and Papua New Guinea. The Australian Institute of Mining and Metallurgy, Melbourne, 963–978.
  2. Bain, J. H. C., Black, L., Blewett, Ft., Bultitude, B., Knutson, J., McKenzie, D., Pain, C., Wilford, J., Dohrenwend, J., Sun, S-S., Trail, D., von Gnielinski, F., and Wellman, P. (1992). ‘Cape York Peninsula update’. Bur. Min. Resourc. Aust. Res. Newsletter16, 18–22.
  3. Gibb, R. A., and Thomas, M. D. (1976). ‘Gravity signature of fossil plate boundaries in the Canadian Shield.’ Nature262, 199–200.
  4. Klasner, J. S., and King, E. R. (1986). ‘Precambrian basement geology of North and South Dakota.’ Can. J. Earth Sci.23, 1083–1102.
  5. Wellman, P. (1990). ‘A tectonic interpretation of the gravity and magnetic anomalies in souther Queensland.’ In Finlayson, D. M. (ed.), The Eromanga-Brisbane geoscience transect: a guide to basin development across Phanerozoic Australia in southern Queensland.’ Bur. Miner. Resour. Austr. Bull.232, 21–34.
  6. Wellman, P. (in press). ‘Structure of the Mount Isa region inferred from gravity and magnetic anomalies.’ In Stewart, A. J., and Blake, D. H. (eds.), Detailed studies of the Mount Isa Inlier. Bur. Min. Resour. Aust. Bull.243.
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  • Article Type: Research Article
Keyword(s): gravity anomaly; magnetic anomaly; north Queensland; Proterozoic

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