Results of an Integrated Helicopter ZTEM-Gravity-Magnetic system test survey over the Vredefort Dome Structure, South Africa

Thomas Wade; Jean M. Legault; Geoffrey Plastow; Carlos Izarra; Andrei Bagrianski

doi:10.1071/ASEG2016ab265

25th International Conference and Exhibition – Interpreting the Past, Discovering the Future

ISSN: 2202-0586
E-ISSN:

oa Results of an Integrated Helicopter ZTEM-Gravity-Magnetic system test survey over the Vredefort Dome Structure, South Africa
Authors Thomas Wade^a, Jean M. Legault^b, Geoffrey Plastow^c, Carlos Izarra^d and Andrei Bagrianski^e
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^a Geotech Ltd., Aurora, CAN, [email protected] ^b Geotech Ltd., Aurora, CAN, [email protected] ^c Geotech Ltd., Aurora, CAN, [email protected] ^d Geotech Ltd., Aurora, CAN, [email protected] ^e Geotech Ltd., Aurora, CAN, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2016, Issue 25th International Conference and Exhibition – Interpreting the Past, Discovering the Future, Dec 2016, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2016ab265
- Published online: 01 Dec 2016

Abstract

In 2016, Geotech completed a test of a helicopter-borne GT-2A gravimeter combined with ZTEM^™ (Z-Axis Tipper Electromagnetics) and aeromagnetic towed bird system over the Vredefort Dome impact structure in South Africa. The survey consisted of nine (9) approx. 70 km long NW-SE oriented flight lines, totalling 640 km, acquired at a nominal spacing of 500 m over an area of approximately 650 km². The successful test demonstrates the feasibility of integrating density measurements using airborne gravimetry on a helicopter platform while combining the superior depth of investigation of ZTEM^™ and aeromagnetics for regional geophysical survey applications.

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References

ASTER GDEM Validation Team, 2009, ASTER global DEM validation summary report, METI and NASA, 28 p.
Cowan, D.R. and Cooper, G.R.J., 2009, Geophysical Dataset Integration of the Vredefort Dome, South Africa: ASEG 20th Geophysical Conference and Exhibition, Extended Abstracts, 4 p.
Labson, V. F., Becker, A., Morrison, H.F., and Conti, U., 1985, Geophysical exploration with audio-frequency natural magnetic fields: Geophysics, 50, 656-664.
Lana, C, Gibson, R.L., Kisters, A.F.M., and Reimold, W.U., 2003, Archean crustal structure of the Kaapvaal craton, South Africa -evidence from the Vredefort dome: Earth and Planetary Science Letters, 206, 133 - 144.
Legault, J.M., 2012, Ten years of passive airborne AFMAG EM development for mineral exploration: 82ND SEG Annual International Meeting, Expanded Abstracts, 5 p.
Legault, J.M., Wilson., G.A., Gribenko, A. , Zhdanov, M.S., Zhao, S. and Fisk, K., 2012, An overview of the ZTEM and AirMt airborne electromagnetic systems - A case study from the Nebo-Babel Ni-Cu-PGE deposit, West Musgrave, Western Australia: Preview, 158, 26-32.
Lo, B., and Zang, M., 2008, Numerical modeling of Z-TEM (airborne AFMAG) responses to guide exploration strategies: 78TH SEG Annual International Meeting, Expanded Abstracts, 1098-1101.
Martinez, C., and Li, Y., 2010, Inversion of regional gravity gradient data over the Vredefort Impact Structure, South Africa: 80th SEG Annual International Meeting, Expanded Abstracts, 841-845.
Sattel, D. and Witherly, K., 2012, Extracting information from ZTEM data with 2D inversions: 21ST ASEG Annual Conference and Exhibition, Extended Abstracts, 4 p.
Venter, N., Fiset, N., Latrous, A., Wade, T., Legault, J.M., and Plastow, G., 2015, Report on a fixed wing z-axis tipper electromagnetic (ZTEM) and aeromagnetic geophysical survey over the ZTEM 2014 Project, Internal report for Ministry of Mines and Energy - Geological Survey of Namibia, 57 p.

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Article Type: Research Article

Keyword(s): Airborne; case-study; Gravity; Magnetic; Vredefort; ZTEM

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oa Results of an Integrated Helicopter ZTEM-Gravity-Magnetic system test survey over the Vredefort Dome Structure, South Africa

Abstract

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