EGU21-1116
https://doi.org/10.5194/egusphere-egu21-1116
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

The Bigger, The Better? – Paleomagnetic recording fidelity of weakly interacting clusters of particles, and implications for micro-scale paleomagnetism

Thomas Berndt, Chen Han, and Jose Devienne
Thomas Berndt et al.
  • Peking University, School of Earth and Space Sciences, Department of Geophysics, Beijing, China (thomasberndt@pku.edu.cn)

A recent trend in paleomagnetism is the study of samples of ever decreasing sizes, going down to (sub)millimeter scales and even microscopic scales, including single-silicate-crystals and meteorites. Microscopic imaging has shown that some of these micro-scale samples appear to be much closer to ideal single-domain (SD) paleomagnetic recorders than bulk rocks. Small samples with large numbers of SD particles do, however, pose the problem of magnetic interactions affecting their paleomagnetic recording fidelity. We show that clusters of particles are common in micro-scale samples and that these interactions do affect thermoremanent magnetization (TRM) acquisition. We further show through numerical simulations that such interacting clusters may be difficult to detect in traditional experiments (such as FORC diagrams), but may nonetheless lead to over- or underestimates in paleointensities.

How to cite: Berndt, T., Han, C., and Devienne, J.: The Bigger, The Better? – Paleomagnetic recording fidelity of weakly interacting clusters of particles, and implications for micro-scale paleomagnetism, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1116, https://doi.org/10.5194/egusphere-egu21-1116, 2021.

Corresponding presentation materials formerly uploaded have been withdrawn.