Matching Magnetic Source Models to Geology – An Example from the Bendigo 1:250,000 Map Sheet, Victoria

Clive Foss

doi:10.1071/ASEG2007ab042

ISSN: 2202-0586
E-ISSN:

oa Matching Magnetic Source Models to Geology – An Example from the Bendigo 1:250,000 Map Sheet, Victoria
Authors Clive Foss^a
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^a Encom Technology, Sydney, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2007, Issue ASEG2007 - 19th Geophysical Conference, Dec 2007, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2007ab042
- Published online: 01 Dec 2007

Abstract

Summary

Relationships between magnetic field anomalies, inversion models and geology are investigated, using examples from the Bendigo 1:250,000 map sheet. The objective of this study is to develop a methodology for encapsulating these relationships in databases which can then be used in interpretation elsewhere. A magnetic anomaly database distils the magnetic field variations from which quantitative estimates of source bodies can be recovered. A related database of inversion models provides those source parameters and supplies a more direct linkage between geology and magnetic field anomalies than can be achieved simply by spatial correlation of the anomalies and geological mapping.

Sensitivity tests are important in evaluating the role of inversion in the process of recovering geological information from magnetic field data. Such tests suggest that to recover depth to a buried source it is generally preferable to treat magnetization as a free variable during inversion rather than risk biasing depth estimates by imposing an incorrect fixed value.

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References

Clark, D.A., 1997, Magnetic petrophysics and magnetic petrology: aids to geological interpretation of magnetic surveys. AGSO Journal of Australian Geology and Geophysics, 17(2), 83-103.
Grant, A.J., 2002, Petrophysics compilation for Victoria. Geological Survey of Victoria (unpublished report)
Grant, F.S., 1985(a), Aeromagnetics, geology and ore environments, I magnetite in igneous, sedimentary and metamorphic rocks: an overview, Geoexploration, 23, 303-333.
Helbig, K., 1963, Some integrals of magnetic anomalies and their relation to the parameters of the disturbing body, Zeitschrift für Geophysik, 29, 83-96.
Moore, D.H., 2006, Bendigo 1:250,000 and part of Deniliquin 1:250,000 map areas: a geological interpretation of the geophysical data. Victorian Initiative for Minerals and Petroleum Report 86. Department of Primary Industries, Victoria.
Scmidt, P.W., and Clark, D.A., 1997, The calculation of magnetic components and moments from TMI: A case study from the Tuckers igneous complex, Queensland, Exploration Geophysics, 29, 609-614.
Slater, K.R., 2001, Bendigo 1:250,000 geological interpretation of the geophysical features. Geological Survey of Victoria

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Article Type: Research Article

Keyword(s): depth; inversion; magnetic; susceptibility

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