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

Author: James Macnae
Journal name: Geophysical Prospecting
Issue: Vol 65, No 4, July 2017 pp. 1071 - 1084
DOI: 10.1111/1365-2478.12463
Organisations: Wiley
Language: English
Info: Article, PDF ( 20.77Mb )

Summary:
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.

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