Airborne vector magnetics mapping of remanently magnetized banded iron formations at Rocklea, Western Australia

Mark Dransfield; Asbjorn Christensen; Guimin Liu

doi:10.1071/EG03093

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

Airborne vector magnetics mapping of remanently magnetized banded iron formations at Rocklea, Western Australia
Authors Mark Dransfield, Asbjorn Christensen and Guimin Liu
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 34, Issue 1-2, Mar 2003, p. 93 - 96
DOI: https://doi.org/10.1071/EG03093
- Published online: 01 Mar 2003

Abstract

Strongly remanent magnetic sources such as those found in the banded iron formations (BIFs) of the Hamersley Basin impair the interpretation of standard total magnetic intensity survey data. The use of aircraft attitude information, provided by the FALCON^TM airborne gravity gradiometer (AGG) system, makes it possible to reference geographically the vector magnetic information collected by the fluxgate triad on board the aircraft. A full aircraft compensation processing method, allowing for permanent, induced, and eddy current effects, provides usable vector magnetic data. These data supply valuable extra information for the interpretation of strongly remanent BIFs.

An example using data from a FALCON survey near the Rocklea Dome in the Hamersley Basin demonstrates improved mapping of the BIFs by the use of the vector-residual magnetic intensity data.

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2026-01-18

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References

Christensen, A. N., and Dransfield, M. H., 2002, Airborne vector magnetometry over banded iron-formations: 72nd Annual International Meeting, Society of Exploration Geophysicists: Expanded Abstracts.
Clark, D. A., and Schmidt, P. W., 1994, Magnetic properties and magnetic signatures of BIFs of the Hamersley Basin and Yilgarn Block, Western Australia: in Geophysical signatures of Western Australian mineral deposits: The University of Western Australia, publication no. 26, 343-354.
de la Hunty, L. E., and Jones, W. R., 1964, Mt Bruce, W. A.: Western Australia Geological Survey, 1:250,000 Geological Series.
Kerr, T. L., O’Sullivan, A. P., Podmore, D. C., Turner, R., and Waters, P., 1994, Geophysics and iron ore exploration: examples from the Jimblebar and Shay Gap-Yarrie regions, Western Australia: in Geophysical signatures of Western Australian mineral deposits: The University of Western Australia, publication no. 26, 355-367.
Lee, J. B., 2001, FALCON gravity gradiometer technology: Exploration Geophysics,32, 247-250.
Leliak, P., 1961, Identification and Evaluation of Magnetic-Field Sources of Magnetic Airborne Detector Equipped Aircraft: IRE Transactions on Aerospace and Navigational Electronics, 8, 95-105.
MacLeod, I. N., Jones, K., and Dai, T. F., 1993, 3-D analytic signal in the interpretation of total magnetic field data at low magnetic latitudes: Exploration Geophysics, 24, 679-688.
van Leeuwen, E. H., 2000, BHP develops world’s first airborne gravity gradiometer for mineral exploration: Preview, 86, 28-30.

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Article Type: Research Article

Keyword(s): airborne; banded iron formations; magnetometry; vector

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Airborne vector magnetics mapping of remanently magnetized banded iron formations at Rocklea, Western Australia

Abstract

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