A moving 3 component fluxgate magnetometer to measure remanent and induced magnetizations in drill core

Clive Foss; Keith Leslie; Wayne Stuart

doi:10.1071/ASEG2015ab067

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa A moving 3 component fluxgate magnetometer to measure remanent and induced magnetizations in drill core
Authors Clive Foss^a, Keith Leslie^b and Wayne Stuart^c
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^a CSIRO Mineral Resources Flagship, Riverside Corporate Park 51 Delhi Road, North Ryde NSW, 1670, , Australia, [email protected] ^b CSIRO Manufacturing Flagship Bradfield Road, , Lindfield, NSW, 2070, , Australia, [email protected] ^c CSIRO Manufacturing Flagship Bradfield Road, , Lindfield, NSW, 2070, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 3
DOI: https://doi.org/10.1071/ASEG2015ab067
- Published online: 01 Dec 2015

Abstract

We have developed a 3 component magnetometer which can be drawn along a track to produce a detailed 3 component mapping of a traverse of up to 3 metres length. One of the main applications for this instrument is to rapidly map both remanent and induced magnetizations within drill-core. Continuous sections of up to 2.5 metres of drill core are logged by running the magnetometer along the side of the core. Multiple runs following successive rotations of the core enable separation of fields arising from remanent magnetization (which rotates with the core) from induced magnetization (which does not). A first-pass interpretation of the multi-track data is made using a string of dipoles as equivalent sources. More detailed model inversions are applied if required. Broken sections of core are logged with sufficient gaps between sections that the anomalies from each are well separated

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References

Austin J., and Foss, C., 2014. The Paradox of Scale: Reconciling magnetic anomalies with rock magnetic properties for cost-effective mineral exploration. Journal of Applied Geophysics, 104, 121-133.
Austin, J. R., Schmidt, P. W., and Foss, C. A., 2013. Magnetic modeling of iron oxide copper-gold mineralization constrained by 3D multiscale integration of petrophysical and geochemical data: Cloncurry District, Australia. Interpretation, Vol. 1, No. 1 (August 2013); p. 1-22.
Constable, C., and Parker, R., 1991. Deconvolution of long-core palaeomagnetic measurements - spline therapy for the linear problem. Geophysical Journal International, Vol. 104, p. 453-468.
Cowan, D., and Cooper, G., 2003. Wavelet analysis of detailed drillhole magnetic susceptibility data, Brockman Iron Formation, Hamersley Basin, Western Australia. Exploration Geophysics, Vol. 34, p. 63-68.
Oda, H., and Shibuya, H., 1996. Deconvolution of long-core palaeomagnetic data of Ocean Drilling Program by Akaike’s Bayesian information criterion minimization. Journal of Geophysical Research, Vol. 101, B2, p. 2815-2834.
Schmidt, P.W., and Lackie, M.A., 2014. Practical considerations: making measurements of susceptibility, remanence and Q in the field. http://dx. doi.org/10.1071/EG14019
Weeks, R., Laj, C., Endignoux, L., Fuller, M., Roberts, A., Manganne, R., Blanchard, E., and Goree, W., 1993. Improvements in long-core measurement techniques: applications in palaeomagnetism and palaeoceanography. Geophysical Journal International, Vol. 114, p. 651-662.

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Article Type: Research Article

Keyword(s): magnetometer drill-core fluxgate remanent magnetization

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oa A moving 3 component fluxgate magnetometer to measure remanent and induced magnetizations in drill core

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