Are Thick Volcanic Piles Concealed In North Australian Proterozoic Basins?

D. E. Leaman

doi:10.1071/EG996013

ISSN: 0812-3985
E-ISSN: 1834-7533

Are Thick Volcanic Piles Concealed In North Australian Proterozoic Basins?
Authors D. E. Leaman^a
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^a Leaman Geophysics, GPO Box 320 Hobart, , Tas., 7001
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 27, Issue 1, Mar 1996, p. 13 - 20
DOI: https://doi.org/10.1071/EG996013
- Published online: 01 Mar 1996

Abstract

Long wavelength magnetic anomalies of moderate amplitude common across large parts of northern Australia are usually assigned to deep sources beneath relatively undisturbed mid Proterozoic or Phanerozoic cover rocks. These can be shown, in the McArthur Basin at least, to be largely due to thick volcanic sequences that either do not outcrop or only outcrop in thinned, onlapped variants near the basin margins. This alternative interpretation of the basin indicates that it might have a scale and formation content comparable with that of the adjacent western Mt Isa sequence and theories about basin formation, mineralising processes and fluid circulation could be reviewed.

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1996-03-01

2026-01-19

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References

Ahmad, M., & Wygralak, A.S., 1989. Calvert Hills SE53-8 1:250 000 metallo-genic map series. Explanatory Notes NT. Geol. Surv.
Blake, D.H., 1987. Geology of the Mount Isa Inlier and Environs. 1: 500 000 geological map sheet. BMR.
Firman, J.B., Johnstone, M.C., Roberts, H.G., Plumb, K.A., Paine, A.G.L., Rhodes, J.M.,Yates, K.R., & Hassan, M.A., 1963. Calvert Hills, 1:250 000 geological map sheet, AGSO.
Leaman, D.E., 1994. Criteria for evaluation of potential field interpretations. First Break, 12, 181-191.
Leaman, D.E., 1995. Application of magnetics to basin structures. Abstract, EAGE 57th Annual Conference, Glasgow, 1, P117.
Plumb, K.A., 1989. Basin models and modern analogues from Mid Proterozoic covers of north Australian Craton. Abstracts Vol 2, 28th IGC, Washington, 1989.
Plumb, K.A., Derrick, G.M., Wilson, I.H., 1980. Precambrian geology of the McArthur River-Mount Isa Region northern Australia in Henderson, R.A., & Stephenson, PJ. (eds) - The Geology and Geophysics fo northeastern Australia. Geol. Soc. Aust. Qld. Div. 71 -88.
Plumb, K.A., SWellman, P., 1987. McArthur Basin Northern Territory. Mapping of deep troughs using gravity and magnetic anomalies. BMR Journal Geology & Geophysics, 10:243-252.
Plumb, K.A., Ahmad, M., Wygralak, A.S., 1990. Mid Proterozoic Basins of the North Australian Craton - Regional Geology and Mineralisation, in Hughes, F.E. (ed) - Geology of the Mineral Deposits of Australia and New Guinea. Aus.l.M.M., 881-902.

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Article Type: Research Article

Keyword(s): magnetics; McArthur Basin; Proterozoic; structure; volcanics

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Are Thick Volcanic Piles Concealed In North Australian Proterozoic Basins?

Abstract

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