Chemical Demagnetization


Chemical demagnetization is demagnetization method that is typically only used on sedimentary rocks. The process relies on the preferential dissolution of small magnetic grains due to their larger surface area to volume ratio. When grains are of equal size, the preference of dissolution is controlled by composition, thereby allow for dissolution of specific minerals. Difficulties with reproducibility, strong dependence on sample permeability, and presence of grain size distributions often limit the usefulness of this technique.


Further Reading


Collinson, D. W. (1965). Origin of remanent magnetization and initial susceptibility of certain red sandstones. Geophysical Journal of the Royal Astronomical Society, 9(2‐3), 203-217, doi: 10.1111/j.1365-246X.1965.tb02071.x

Henry, S. G. (1979), Chemical demagnetization: methods, procedures, and applications through vector analysis, Canadian Journal of Earth Sciences, 16, 1832–1841, doi: 10.1139/e79-167

Tarling, D. H. (1983), Palaeomagnetism: Principles and Applications in Geology, Geophysics and Archaeology, Chapman and Hall, London, §3.3.5 and §5.5.4.


See Also


Alternating Field (AF) Demagnetization
Orthogonal vector Component Diagrams
Principle Component Analysis (PCA)
Thermal Demagnetization
Thermoremanent Magnetization (TRM)