Constraining structural dip and magnetization direction of a sheet from its static and dynamic magnetic anomalies

Clive Foss; David Clark; Shane Keenan; Keith Leslie

doi:10.1080/22020586.2019.12073127

2nd Australasian Exploration Geoscience Conference: Data to Discovery

ISSN: 2202-0586
E-ISSN:

oa Constraining structural dip and magnetization direction of a sheet from its static and dynamic magnetic anomalies
Authors Clive Foss^a, David Clark^b, Shane Keenan^c and Keith Leslie^d
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^a CSIRO Mineral Resources North Ryde, , Sydney, [email protected] ^b CSIRO Manufacturing Lindfield, , Sydney, [email protected] ^c CSIRO Manufacturing Lindfield, , Sydney, [email protected] ^d CSIRO Manufacturing Lindfield, , Sydney, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2019, Issue 2nd Australasian Exploration Geoscience Conference: Data to Discovery, Dec 2019, p. 1 - 5
DOI: https://doi.org/10.1080/22020586.2019.12073127
- Published online: 01 Dec 2019

Abstract

Summary

Following advances in magnetometer instrumentation and inversion software we re-explore the feasibility of a field methodology utilising relationships between magnetization and dynamic (time-variation) magnetic field anomalies to recover structural information from magnetic field data over thin sheets. We show that we can estimate the dip of a sheet from a reliably determined dynamic magnetic anomaly induced by the range of the magnetic field through its diurnal variation. The strength and inclination of remanent magnetization in the plane perpendicular to the sheet can be subsequently estimated from the static magnetic anomaly using that pre-determined dip angle. The principal challenge in working with dynamic magnetic anomalies is their low amplitude and the requirement for multiple measurements at each station. These relationships between magnetizations and fields apply equally to field gradients. SQUID magnetometers and gradiometers can provide a feasible solution to the high resolution measurements required for this application

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References

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/content/journals/10.1080/22020586.2019.12073127

Article Type: Research Article

Keyword(s): SQUID magnetic anomaly sheet remanent magnetization time-variation

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oa Constraining structural dip and magnetization direction of a sheet from its static and dynamic magnetic anomalies

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