McArthur Basin Architecture – a New Perspective From Geophysics and GIS

Mark L. Duffett; David E. Leaman

doi:10.1071/EG997039

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

McArthur Basin Architecture – a New Perspective From Geophysics and GIS
Authors Mark L. Duffett^a and David E. Leaman^b
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^a Centre for Ore Deposit and Exploration Studies, University of Tasmania, , GPO Box 252-79C, Hobart, , Tas, 7001, . Phone(03) 6220 2391, Facsimile(03) 6220 2547, e-mail (preferred):[email protected] ^b Leaman Geophysics, , GPO Box 320D, Hobart, , Tas, 7001, . (also Centre for Ore Deposit and Exploration Studies)
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 28, Issue 1-2, Mar 1997, p. 39 - 42
DOI: https://doi.org/10.1071/EG997039
- Published online: 01 Mar 1997

Abstract

Interpretations of the gross geometry of the McArthur Basin from regional potential field data are presented as a 2.5-D component of a metallogenic geographic information system (GIS) developed for the region. The McArthur Group, host to the major HYC Pb-Zn deposit, is seen to extend well beyond its eastern limit of outcrop as defined by the Emu Fault. Units identified as prospective using lithological criteria encoded in the GIS contain all known stratiform base metal mineralisation. Such deposits are preferentially located on the periphery of the thickest accumulations of McArthur Group sedimentary rocks.

Volcanism in the upper and lower Tawallah Group is much more voluminous than its comparatively small strati-graphic thickness measured in outcrop would suggest. Over 15 km of basin fill (including volcanic rocks) is implied in some areas, but this may vary rapidly, implying considerable pre-McArthur Group structural development. A number of lineaments visible in the isochore images converge at the position of HYC, indicating bounding fault and strike-slip fault activity at this location during a large portion of basin evolution. These structures do not necessarily correspond to major regional faults interpreted from surface mapping.

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References

Blake, D.H., 1987, Geology of the Mount Isa Inlier and environs, Queensland and the Northern Territory: Bureau of Mineral Resources, Bulletin 225, 83pp.
Etheridge, M.A., Rutland, R.W.R. and Wyborn, L.A.I., 1987, Orogenesis and tectonic process in the early to middle Proterozoic of northern Australia. In Kroner, A., ed., Proterozoic lithospheric evolution: Geodynamics Series 17, 131-147. (American Geophysical Union and Geological Society of America, Washington D.C.)
Knox-Robinson, CM., Robinson, D.C. and Groves, D.I., 1992, The use of geographical information systems as a gold prospectivity mapping tool, with reference to the Yilgarn Block, Western Australia: requirements and limitations: In Geological applications of geographic information systems (GIS): Australian Institute of Geoscientists, Bulletin 12, 71-82.
Leaman, D.E., 1994, Criteria for evaluation of potential field interpretations: First Break 12, 181-191.
Leaman, D.E., 1996, Are thick volcanic piles concealed in north Australian Proterozoic basins?: Exploration Geophysics 27, 13-20.
Pietsch, B.A., Rawlings, D.J., Creaser, P.M., Kruse, P.D., Ahmad, M., Ferenczi, P.A. and Findhammer, T.L.R., 1991, Bauhinia Downs SE53-3. 1:250,000 geological map series. Northern Territory Geological Survey.
Plumb, K.A., 1988, Geology of the McArthur Basin (1:1,000,000 scale map). Bureau of Mineral Resources, Canberra.
Wyborn, L.A.I., Gallagher, R., Jaques, A.L., Jagodzinski, E.A., Thost, D. and Ahmad, M., 1994, Developing metallogenic geographic information systems: examples from Mount Isa, Kakadu and Pine Creek: AusIMM Darwin Annual Conference Proceedings, pp. 129-133.

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Article Type: Research Article

Keyword(s): basin architecture; GIS; gravity; magnetics; McArthur Basin; metal-logeny; Proterozoic; structure

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McArthur Basin Architecture – a New Perspective From Geophysics and GIS

Abstract

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