SPM Effect in Glacial Till

Markku Montonen

doi:10.1071/ASEG2015ab230

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

ISSN: 2202-0586
E-ISSN:

oa SPM Effect in Glacial Till
Authors Markku Montonen^a
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^a FQM FinnEx Ltd., Kaikutie 1, Sodankyla, , Finland, [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 - 4
DOI: https://doi.org/10.1071/ASEG2015ab230
- Published online: 01 Dec 2015

Abstract

The SPM effect is not traditionally associated with glacial tills. However, effects of viscous magnetization, i.e. superparamagnetism, are observed in many places in Northern Finland in high sensitivity and low frequency time domain ground EM surveys. These effects are typically observed on late time channels and they have a very good correspondence with magnetic anomalies. Usually there is also a clear reverse frequency domain RE component anomaly observed simultaneously with the SPM effect. In Ni ore prospecting it is essential to be able to recognize SPM effect because it has a response similar to a deep seated massive nickel ore body i.e. a deep seated very high conductivity conductor. Characteristic feature for SPM effect in time domain dB/dt data is its 1/t decay which can be used as a means to recognize this phenomenon. We also discuss alternative methods to recognize SPM effect.

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2015-12-01

2026-01-14

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References

Barsukov, P.O. and Fainberg, E.B., 2001, Superparamagnetic effect over gold and nickel deposits, European Journal of Environmental and Engineering Geophysics, 6, 61-72.
Barrocu, G. and Ranieri, G., 2000, TDEM: A useful tool for identifying and monitoring the fresh-saltwater interface, Proceedings of the 16th SWIM, Wolin Island, Selected Paper.
Dabas, M., Jolivet, A. and Tabbagh, A., 1992, Magnetic susceptibility and viscosity of soils in a weak time varying field, Geophysical Journal International, 108, 101-109.
Nabighian M. N., 1991, Electromagnetic methods in applied geophysics, Volume 2, Society of Exploration Geophysicists.

/content/journals/10.1071/ASEG2015ab230

Article Type: Research Article

Keyword(s): electromagnetics; glacial till; magnetics; Ni ore prospecting; SPM effect

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