Airborne IP detects only fine-grained minerals when compared to conventional IP

James Macnae

doi:10.1071/ASEG2016ab141

25th International Conference and Exhibition – Interpreting the Past, Discovering the Future

ISSN: 2202-0586
E-ISSN:

oa Airborne IP detects only fine-grained minerals when compared to conventional IP
Authors James Macnae^a
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^a RMIT University: School of Science, GPO Box 2476 Melbourne, 3001, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2016, Issue 25th International Conference and Exhibition – Interpreting the Past, Discovering the Future, Dec 2016, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2016ab141
- Published online: 01 Dec 2016

Abstract

Using a thin-sheet model, it is possible to predict Cole-Cole parameters of polarizable materials in the near-surface from airborne EM data. With the high frequency of AEM systems, typically more than 100 times higher than ground IP systems, most conventional IP targets will often not show an AIP response. Very fine-grained minerals, around 0.1 mm in average dimension, are however good sources for AIP responses. In 6 examples from Tasmania and NSW comparing AIP with ground IP, 5 have AIP responses that are not coincident with ground responses, but may detect finer grained minerals in the periphery of the alteration system associated with a mineral deposit.

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2016-12-01

2026-01-18

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References

Hallof, P. and J. Klein, 1983: Characterization of Electrical Properties of Metallic Mineral Deposits, Ontario Geological Survey Open File Report 5468
Macnae, J., 2015, Quantifying Airborne Induced Polarization effects in helicopter time domain electromagnetics, Journal of Applied Geophysics, published online http://dx.doi.org/10.10167i.iappgeo.2015.10.016.
Macnae, J., 2016, Quantitative estimation of intrinsic induced polarization and superparamagnetic parameters from airborne electromagnetic data, Geophysics (submitted)
Macnae J., and Hine, K., 2016, Comparing airborne inductive and ground induced polarization: examples from Australia.Geophsyics (submitted).
Vanhala, H., 1997, Laboratory and field studies of environmental and exploration applications of the spectral induced-polarization (SIP) method; PhD thesis, Helsinki University of Technology.
Wong, J., 1979. An electrochemical model of the induced polarization phenomenon in disseminated sulfide ores. Geophysics, 44, 1245-1265.
Zorin, N., 2014, Spectral induced polarization of low and moderately polarizable buried objects, Geophysics 80, no. 5, E267-E276.

/content/journals/10.1071/ASEG2016ab141

Article Type: Research Article

Keyword(s): Airborne Induced Polarization; electromagnetics

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oa Airborne IP detects only fine-grained minerals when compared to conventional IP

Abstract

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