Local Magnetic Anomalies Explain Bias in Paleomagnetic Data: Consequences for Sampling

Romy Meyer*, Lennart V. de Groot

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Volcanic rocks are considered reliable recorders of past changes in the Earth's magnetic field. Recent flows, however, sometimes fail to produce the known magnetic field at the time of cooling. Previous research on Mt. Etna suggests paleomagnetic data might not be accurately recorded. Here we test the accuracy of paleomagnetic data obtained from Mt. Etna lavas by comparing paleomagnetic data from historical flows to direct measurements of the magnetic field above the current topography. The inclinations and intensities in both data sets are biased toward lower values, while there is no such trend for the declination. Inclinations are on average 2.9° lower than expected; intensities are on average 8.8 µT lower. The deviations from the expected values depend on the height above the flow. Moreover, the inclinations and intensities vary as a function of topography. Both are higher above ridges and lower in gullies; the variations within a site are up to 14.1° in inclination and 12.9 µT for intensity. To suppress this paleomagnetic data bias it is important to take samples several meters apart and from different parts of the flow whenever possible. While this leads to a higher degree of scatter in paleodirections, the results better represent the Earth's magnetic field at the time of cooling. This emphasizes the importance of reporting paleomagnetic sampling strategies in detail.

Original languageEnglish
Article numbere2023GC011319
JournalGeochemistry, Geophysics, Geosystems
Volume25
Issue number5
DOIs
Publication statusPublished - May 2024

Bibliographical note

Publisher Copyright:
© 2024 The Authors. Geochemistry, Geophysics, Geosystems published by Wiley Periodicals LLC on behalf of American Geophysical Union.

Funding

FundersFunder number
Nederlandse Organisatie voor Wetenschappelijk OnderzoekVI.Vidi.192.047, 863.15.003
Nederlandse Organisatie voor Wetenschappelijk Onderzoek

    Keywords

    • magnetic anomalies
    • paleodirections
    • paleointensity
    • paleomagnetism
    • rock magnetism

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