A Regional Scale Gravity Survey of the Southern Cross Greenstone Belt, Western Australia

D. J. Rout; M. C. Dentith; W. E. Featherstone

doi:10.1071/EG995233

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

A Regional Scale Gravity Survey of the Southern Cross Greenstone Belt, Western Australia
Authors D. J. Rout^a, M. C. Dentith^b and W. E. Featherstone^c
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^a Key Centre for Strategic Mineral Deposits Department of Geology & GeophysicsUniversity of Western Australia, Nedlands Perth, WA, 6907, Phone:(09) 380 1874, Fas:(09) 380 1178 ^b Department of Geology & GeophysicsUniversity of Western Australia, Nedlands Perth, WA, 6907 ^c School of Surveying and Land InformationCurtin University of Technology, GPO Box U1987 Perth, WA, 6001
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 26, Issue 2-3, Jun 1995, p. 233 - 240
DOI: https://doi.org/10.1071/EG995233
- Published online: 01 Jun 1995

Abstract

A case study is presented from the Southern Cross Greenstone Belt, Western Australia, where regional scale gravity data have been collected in order to study the belt and associated granitoid bodies. Differential Global Positioning System (GPS) satellite surveying techniques have been used to coordinate the gravity observations, and automated processing techniques, such as terrain corrections based on digital elevation models (DEMs), have been used as part of the study. These approaches greatly reduce the manual effort and time needed to collect and process the gravity data.

While the use of GPS methods introduces further considerations in data reduction, such as the geoid-spheroid separation, it can provide up to a 250% increase in efficiency in the field while collecting survey data. The computer based terrain correction calculation using a DEM provides a considerable saving in the time expended on data reduction. With the introduction of such field practices and reduction methods, gravity as a semi-regional scale exploration tool is becoming more attractive.

The present study has shown that station spacings of 1 km should be considered a maximum when working on the semi-regional scale (50 - 60 km square areas), with closer station spacings (500 m maximum) more appropriate close to expected geological contacts.

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References

de Beer, J.H., Stettler, E.H., du Plessis, J.G., and Blume, J., 1988, The deep structure of the Barberton greenstone belt: a geophysical study: South African Journal of Geology 91, 184-197.
Dentith, M.C., House, M., Ridley, J.R., and Trench, A., 1992, Three-dimensional structure of greenstone belts in Western Australia: implications for gold exploration: Exploration Geophysics 23, 105-110.
Featherstone, W.E., 1993, GPS coordinate transformations and their use in gravimetry: Exploration Geophysics 24, 487-491.
Featherstone, W.E., and Dentith, M.C., 1994, Matters of gravity: the search for gold: GPS World 4(7), 34-39.
Gee, R.D., 1982, Southern Cross, Western Australia: West Australian Geological Survey, 1:250 000 Geological Series Map and Explanatory Notes.
Hoffman-Wellenhof, B., Lichtenegger, H. and Collins, J., 1993, GPS Theory and practice: 2nd Edition, Spinger-Verlag.
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Article Type: Research Article

Keyword(s): automated terrain correction; global positioning satellite system; GPS; gravity

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A Regional Scale Gravity Survey of the Southern Cross Greenstone Belt, Western Australia

Abstract

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