Exploring Through Cover - The Integrated Interpretation of High Resolution Aeromagnetic, Airborne Electromagnetic and Ground Gravity Data from the Grant’s Patch Area, Eastern Goldfields Province, Archaean Yilgarn Craton Part A: Mapping Geology using Airborne Electromagnetics (TEMPEST)

Lisa Worrall; Richard Lane; Jayson Meyers; Alan Whitaker

doi:10.1071/EG01190

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

Exploring Through Cover - The Integrated Interpretation of High Resolution Aeromagnetic, Airborne Electromagnetic and Ground Gravity Data from the Grant’s Patch Area, Eastern Goldfields Province, Archaean Yilgarn Craton Part A: Mapping Geology using Airborne Electromagnetics (TEMPEST)
Authors Lisa Worrall^a, Richard Lane^b, Jayson Meyers^c and Alan Whitaker^d
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^a AGSO, , Australia, [email protected] ^b Fugro Airborne Surveys, [email protected] ^c Consultant, , Australia, [email protected] ^d AGSO, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 32, Issue 3-4, Sep 2001, p. 190 - 193
DOI: https://doi.org/10.1071/EG01190
- Published online: 01 Sep 2001

Abstract

Conductivity values derived from TEMPEST AEM data were compared with conductivity values derived from ground EM data and borehole induction logs. The high degree of correlation at scales of around 100 m laterally and less than 10 m vertically allow the conductivity data derived from AEM data to be interpreted with confidence.

An extensive drilling database was used to interpret the conductivity distribution. This showed that the conductivity variations at Grant’s Patch are principally associated with the regolith, specifically with in situ saprolite. The fresh bedrock in this area is uniformly resistive in comparison with the regolith, which attains a maximum conductance of around 50 S. The regolith conductivity variations can be used to infer basement lithology because the regolith is largely in-situ and the thickness and conductivity of the regolith materials are demonstrably litho-dependent.

Information derived from the AEM data has lead to a significantly improved understanding of the geology (lithology, structure, alteration and weathering) in the Grant’s Patch Area.

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References

Emerson, D.W. and Yang, Y.P., 1997, Effects of Water Salinity and Saturation on the Electrical Resistivity of Clays: Preview, June 1997, 19-24.
Hunter, W.M., 1993. Geology of the Granite-Greenstone Terrane of the Kalgoorlie and Yilmia 1:100 000 Sheets, Western Australia. Geological Survey of Western Australia, Report 35, 80p.
Lane, R., 2000, Conductive unit parameters: summarising complex conductivity distributions: 70th Meeting, SEG, Calgary, Expanded Abstracts, Volume 1, Section EM4.2, 328-331.
Lane, R., Green, A., Golding, C., Owers, M., Pik, P., Plunkett, C., Sattel, D., and Thorn, B., 2000, An example of 3D conductivity mapping using the TEMPEST airborne electromagnetic system: Exploration Geophysics, 31, 162-172.
Macnae, J.C., King, A., Stolz, N., Osmakoff, A., Blaha, A., 1998, Fast AEM data processing and inversion: Exploration Geophysics, 29, 163-169.
Meyers, J., Worrall, L., Lane, R., and Bell, B. 2001. Exploring through cover - the integrated interpretation of high resolution aeromagnetic, airborne electromagnetic and ground gravity data from the Grant's Patch area, Eastern Goldfields Province, Archaean Yilgarn Craton. Part C: Combining geophysical methods for a holistic exploration model. Exploration Geophysics (this volume).
Palacky, G.J., 1981, The airborne electromagnetic method as a tool for geological mapping: Geophysical Prospecting, 29, 60-88.
Swager, C.P., Griffin, TJ., Witt, W.K., Wyche, S., Ahmat, A.L., Hunter, W.M., and McGoldrick, PJ., 1995, Geology of the Archean Kalgoorlie Terrane - An Explanatory Note: Geological Survey of Western Australia. Report 48, 26p.
Witt, W.K., 1994, Geology of the Bardoc 1: 100 000 sheet - Explanatory notes. Geological Survey of Western Australia, 50p.
Worrall, L., Munday, TJ. and Green, A.A., 1998, Beyond bump finding - airborne electromagnetics for mineral exploration in regolith dominated terrains: Exploration Geophysics, 29, 1-5.

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Article Type: Research Article

Keyword(s): AEM; Archean; geological mapping; greenstones; ground EM; regolith; TEMPEST

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Exploring Through Cover - The Integrated Interpretation of High Resolution Aeromagnetic, Airborne Electromagnetic and Ground Gravity Data from the Grant’s Patch Area, Eastern Goldfields Province, Archaean Yilgarn Craton Part A: Mapping Geology using Airborne Electromagnetics (TEMPEST)

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