Definitive superparamagnetic source identification through spatial, temporal, and amplitude analysis of airborne electromagnetic data

ABSTRACT The aim of this paper is to add confidence to existing methods using decay shape analysis to detect superparamagnetic responses in airborne electromagnetic data. While expensive to acquire, vertical spatial gradient measurements of the electromagnetic signals can discriminate near‐surface s...

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Bibliographic Details
Published in:Geophysical Prospecting 2017-07, Vol.65 (4), p.1071-1084
Main Author: Macnae, James
Format: Article
Language:English
Subjects:
Airborne sensing
Amplitude
Amplitudes
Data
Data Processing
Decay
Electromagnetics
Gradients
Identification
Indicators
Interpretation
Magnetics
Methods
Mineral exploration
Shape
Spatial analysis
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Summary:ABSTRACT The aim of this paper is to add confidence to existing methods using decay shape analysis to detect superparamagnetic responses in airborne electromagnetic data. While expensive to acquire, vertical spatial gradient measurements of the electromagnetic signals can discriminate near‐surface superparamagnetic sources. This research investigated the use of horizontal spatial gradients and amplitude information as further indicators of superparamagnetic. High horizontal gradients were shown both theoretically and in field data to help discriminate superparamagnetic from deep mineral targets. Further, superparamagnetic responses have characteristically small amplitudes inconsistent with realistic mineral exploration targets at shallow depths.
ISSN:0016-8025
1365-2478
DOI:10.1111/1365-2478.12463