Magnetic imaging of the effect of stress on the remanent magnetization of basalt
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Differential compressional stresses (<100MPa) that do not result in permanent deformation have traditionally been considered insufficient to modify paleomagnetic signals; however, recent numerical predictions have challenged this assumption. Using quantum diamond microscopy, we experimentally determined the effects of low differential stresses on the remanent magnetization of columnar basalt samples from Seljadalur, Iceland. We show that although individual magnetic dipoles rotate by up to 40°, the bulk magnetization direction remains largely unchanged. These rotations reflect opposing single–domain–like and single-vortex–like behaviors that cancel directionally; however, the bulk magnetization intensity decreases. This behavior is consistent with micromagnetic model predictions for mixed–domain-state samples. Given that differential stresses<<1GPa are common in undeformed rocks distal to earthquake rupture zones and impact craters, it is essential to account for stress effects when interpreting paleomagnetic data from geological materials.
Date Issued
2026-09-24
Date Acceptance
2026-09-24
Citation
Geophysical Research Letters, 2026
ISSN
0094-8276
Publisher
Wiley
Journal / Book Title
Geophysical Research Letters
Copyright Statement
Copyright This paper is embargoed until publication. Once published the Version of Record (VoR) will be available on immediate open access.
License URL
Publication Status
Accepted