Western Tasmanian Regional Minerals Program (part 2): airborne electromagnetic data – quality control and interpretation

J. E. Reid; P. Fullagar; J. R. Bishop; A. D. Fitzpatrick; R. Richardson; D. L. Griggs

doi:10.1071/ASEG2003ab140

ISSN: 2202-0586
E-ISSN:

oa Western Tasmanian Regional Minerals Program (part 2): airborne electromagnetic data – quality control and interpretation
Authors J. E. Reid^a, P. Fullagar^b, J. R. Bishop^c, A. D. Fitzpatrick^d, R. Richardson^e and D. L. Griggs^f
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^a CODES/University of Tasmania, , Australia, [email protected] ^b Fullagar Geophysics Pty. Ltd.,, Australia, [email protected] ^c Mitre Geophysics, , Australia, [email protected] ^d University of Tasmania, , Australia, [email protected] ^e Mineral Resources Tasmania, , Australia, [email protected] ^f University of Tasmania, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2003, Issue ASEG2003 - 16th Geophysical Conference, Aug 2003, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2003ab140
- Published online: 01 Aug 2003

Abstract

Recent regional scale helicopter electromagnetic (HEM) data acquired on the west and northwest coasts of Tasmania have demonstrated the powerful geological mapping capabilities of the HEM technique.

Quality control for the survey was provided by analysis of repeat data from daily test lines, and comparison with surface geophysical data. Data have been interpreted by conductivity-depth imaging, complemented by layered-earth inversion of selected lines. The maximum depth of investigation for the HEM survey has been determined to be around 150 m, based on both theoretical calculations and the results of conductivity-depth imaging.

A preliminary interpretation of the HEM data is presented for the Balfour region. The HEM survey has clearly differentiated previously unmapped units within the Proterozoic Rocky Cape Group, and has defined several major structural trends within the survey area. A large number of bedrock conductors have been identified in the HEM data, particularly close to the historic copper mining centre of Balfour.

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References

D'Andrea, L., 2001, Interpretation and verification of an airborne EM survey, Zeehan: B. Sc. (Hons.) thesis, University of Tasmania.
Fullagar, P. K. and Oldenburg, D. W., 1984, Inversion of horizontal loop electromagnetic frequency soundings: Geophysics, 49, 150-164.
Griggs, D.L., 2002, Interpretation of the Meredith HEM survey, Northwest Tasmania: B. Sc. (Hons.) thesis, University of Tasmania.
Huang, H., and Fraser, D. C, 2000, Airborne resistivity and susceptibility mapping in magnetically polarizable areas: Geophysics, 65, 502-511
Macnae, J., King, A., Stolz, N., Osmakoff, A. and Blaha, A., 1998, Fast AEM data processing and inversion: Exploration Geophysics, 29, 163-169.
Peltoniemi, M., 1998, Depth of penetration of frequency-domain airborne electromagnetics in resistive terrains: Exploration Geophysics, 29, 12-15.
Sengpiel, K-P., 1988, Approximate inversion of airborne EM data from a multilayered ground: Geophysical Prospecting, 36, 446-459.
Veska, L., 1993, Geology, mineralisation and structure of the Balfour copper occurrence, North-western Tasmania: B. Sc. (Hons.) thesis, University of Tasmania.

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Article Type: Research Article

Keyword(s): conductivity-depth transformation; helicopter electromagnetic; Western Tasmania

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