Inversion of Magnetic Data from Remanent and Induced Sources

Robert G. Elllis; Barrry de Wet; Ian N. Macleod

doi:10.1071/ASEG2012ab117

ISSN: 2202-0586
E-ISSN:

oa Inversion of Magnetic Data from Remanent and Induced Sources
Authors Robert G. Elllis^a, Barrry de Wet^b and Ian N. Macleod^c
View Affiliations Hide Affiliations

^a Geosoft Inc., Suite 810, 207 Queens Quay West, Toronto, ON, , Canada, [email protected] ^b Ivanhoe Australia Ltd., Level 13, 484 St Kilda Road Melbourne, , VIC, 3004, , Australia, [email protected] ^c Geosoft Inc., Suite 810, 207 Queens Quay West, Toronto,ON, , Canada, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2012, Issue ASEG2012 - 22nd Geophysical Conference, Dec 2012, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2012ab117
- Published online: 01 Dec 2012

Abstract

Summary

Magnetic field data are of fundamental importance in many areas of geophysical exploration with 3D voxel inversion being a common aid to their interpretation. In the majority of voxel based inversions it is assumed that the magnetic response arises entirely from magnetic induction. However, in the last decade, several studies have found that remanent magnetization is far more prevalent than previously thought. Our experience with numerous minerals exploration projects confirms that the presence of non-induced magnetization is the rule rather than the exception in base metals exploration.

In this work we show that failure to accommodate for remanent magnetization in 3D voxel-based inversion can lead to misleading interpretations. We present a technique we call Magnetization Vector Inversion (MVI), which incorporates both remanent and induced magnetization without prior knowledge of the direction or strength of remanent magnetization. We demonstrate our inversion using model studies and field data. Successful application to numerous minerals exploration surveys confirms that incorporating remanent magnetization is essential for the correct interpretation of magnetic field data.

Article metrics loading...

/content/journals/10.1071/ASEG2012ab117

2012-12-01

2026-01-16

From This Site

/content/journals/10.1071/ASEG2012ab117

dcterms_title,dcterms_subject,pub_keyword

-contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution

10

5

Full text loading...

References

Butler, R. F., 1992, Paleomagnetism: magnetic domains to geologie terranes, Blackwell Scientific Publications.
Kubota, R., and Uchiyama A., 2005, Three-dimensional magnetization vector inversion of a seamount, Earth Planets Space, 57, 691-699
Li, Y., and D. W. Oldenburg, 3-D inversion of magnetic data, Geophysics, 61, 1996, 394-408.
Lelièvre, P. G., and Oldenburg, D. W., 2009, A 3D total magnetization inversion applicable when significant, complicated remanence is present, Geophysics, 74, L21-L30
McEnroe, S. A., Fabian, K., Robinson, P., Gaina, C., Brown, L., 2009, Crustal Magnetism, Lamellar Magnetism and Rocks that Remember, Elements, 5, 241-246.
Pilkington, M., 1997, 3-D magnetic imaging using conjugate gradients, Geophysics, 62, 1132-1142.
Rutherford, N. F., Lawrance, L. M., and Sparks, G., 2005, Osborne Cu-Au Deposit, Clonclurry, North West Queensland, CRC LEME Report.
Shearer, S., and Y. Li, 2004, 3D Inversion of magnetic total gradient data in the presence of remanent magnetization: 74th Annual Meeting, SEG, Technical Program, Expanded Abstracts, 23, 774-777.
Silva, J. B. C., Medeiros, W. E., and Barbosa, V. C. F., 2001, Potential-field inversion: Choosing the appropriate technique to solve a geologic problem, Geophysics, 66, 511 - 520.
Telford, W. M., Geldart, L. P., Sherriff, R. E., and Keys, D. A., 1990, Applied Geophysics, Cambridge University Press.
Tullemans, F. J., Agnew P., and Voulgaris, P., 2001, The Role of Geology and Exploration Wiithin the Mining Cycle at the Osborne Mine, NW Queensland, in Monograph 23 - Mineral Resource and Ore Reserve Estimation - The AuslMM Guide to Good Practice, Australian Institute of Mining and Metallurgy, Melbourne, 157-168.
Zdhanov, M. S., 2002, Geophysical Inverse Theory and Regularization Problems, Method in Geochemistry and Geophysics 36, Elsevier Science B.V., Amsterdam, The Netherlands.
Zhdanov, M. S., and Portniaguine, O., 2002, 3-D magnetic inversion with data compression and image focusing, Geophysics, 67, 1532-1541

/content/journals/10.1071/ASEG2012ab117

Article Type: Research Article

Keyword(s): 3D; inversion; magnetization vector inversion.; remanent magnetization

Most Cited This Month Most Cited RSS feed

- Inversion of data from electrical imaging surveys in water-covered areas
  
  Authors M. H. Loke and J. W. Lane
- Inversion of Magnetic Data from Remanent and Induced Sources
  
  Authors Robert G. Elllis, Barrry de Wet and Ian N. Macleod
- A comparison of smooth and blocky inversion methods in 2-D electrical imaging surveys
  
  Authors M. H. Loke, Ian Acworth and Torleif Dahlin
- Designing matched bandpass and azimuthal filters for the separation of potential-field anomalies by source region and source type
  
  Authors Jeffrey D. Phillips
- Bad Colour Maps Hide Big Features and Create False Anomalies
  
  Authors Peter Kovesi
- Practical 3D EM inversion – the P223F software suite
  
  Authors Art Raiche, Fred Sugeng and Glenn Wilson
- Estimating Noise Levels in AEM Data
  
  Authors Andy Green and Richard Lane
- Target delineation using Full Tensor Gravity Gradiometry data
  
  Authors Colm A. Murphy and James Brewster
- Transdimensional Monte Carlo Inversion of AEM Data
  
  Authors Ross C Brodie and Malcolm Sambridge
- The geotech VTEM time domain helicopter em system
  
  Authors Ken Witherly, Richard Irvine and Edward Morrison
More Less

oa Inversion of Magnetic Data from Remanent and Induced Sources

Abstract

Most Read This Month

Most Cited This Month Most Cited RSS feed