Mapping subsurface geological structure using TEMPEST data, McArthur Basin, Northern Territory

Peter Kovac; Jacqueline Hope; Lynsey Brett; Jeff Randell

doi:10.1071/ASEG2013ab038

ISSN: 2202-0586
E-ISSN:

oa Mapping subsurface geological structure using TEMPEST data, McArthur Basin, Northern Territory
Authors Peter Kovac^a, Jacqueline Hope^b, Lynsey Brett^c and Jeff Randell^d
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^a Fugro Airborne Surveys, Pty Ltd, 435 Scarborough Beach Rd. Osborne Park, , WA, 6916, [email protected] ^b Fugro Airborne Surveys, 435 Scarborough Beach Rd. Osborne Park, , WA, 6916, [email protected] ^c Mira Geoscience Asia Pacific Pty Ltd, 369 Newcastle St Northbridge, , WA, 6003s, [email protected] ^d Geos Mining Pty, 68 Alfred Street Milsons Point, , NSW, 2061, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2013, Issue ASEG2013 - 23rd Geophysical Conference, Dec 2013, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2013ab038
- Published online: 01 Dec 2013

Abstract

Airborne TEMPEST electromagnetic (EM) and magnetic data was acquired over the Bulman project area in the McArthur Basin to identify the geological environment of stratabound carbonate-hosted Pb-Zn mineralisation. The Late Palaeoproterozoic to Early Mesoproterozoic sedimentary fill of the McArthur Basin in the Bulman area is intruded by Early Mesoproterozoic dolerite dykes and sills. The location of the dykes and sills was mapped using magnetic data. The depth of the intrusives was estimated by mapping resistive basement on Conductivity Depth Transforms (CDTs) generated from the TEMPEST B-field Z-component data. Additionally, a 3D conductivity voxel model was constructed from the CDTs to show the conductivity distribution in rocks.

There is no marked conductivity contrast between intrusives and sediments making up the resistive basement. Instead, the resistive basement horizon is interpreted to represent the base of the Cenozoic unconsolidated deposits or part of the Proterozoic sedimentary rocks. In places, the base of a sub-surface conductive zone is interpreted to be the top of the intrusives. The thickness of sediments above the resistive basement is variable, reaching up to 170 metres in the central - eastern part of the study area.

3D geological model was constructed to assist in visualising the distribution of interpreted geological units and the tectonic pattern

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References

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Jackson, M. J., Muir, M. D., and Plumb, K. A., 1987, Geology of the southern McArthur Basin, Northern Territory: Bureau of Mineral Resources, Geology and Geophysics, Bulletin, 1- 220.
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Macnae, J. C., Smith, R., Polzer, B. D., Lamontagne, Y., and Klinkert, P. S., 1991, Conductivity-Depth Imaging of Airborne Electromagnetic Step-Response Data: Geophysics, 56, 102-114.
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Sweet, I. P. and Brakel, A. T., 1999, Mount Marumba, Northern Territory - 1:250 000 Geological Map Series. Explanatory Notes, SD 53-6 (second edition): Australian Geological Survey Organisation and Northern Territory Geological Survey (National Geoscience Mapping Accord).

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Article Type: Research Article

Keyword(s): McArthur Basin; stratabound carbonate-hosted Pb-Zn mineralisation; Tempest

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oa Mapping subsurface geological structure using TEMPEST data, McArthur Basin, Northern Territory

Abstract

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