Other
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..86...39c&link_type=abstract
Earth and Planetary Science Letters, Volume 86, Issue 1, p. 39-45.
Other
13
Scientific paper
The effect of strain upon isothermal remanent magnetization (IRM) carried by hematite particles embedded in a plasticine matrix has been investigated. Magnetized artificial hand samples were deformed by simple coaxial shortening. After deformation, the hand-samples were cut into 8-15 specimens and each specimen's IRM measured. Hence a mean IRM direction was obtained for each shortening step. The main results are:
(1)|When the initial direction of IRM is parallel to the shortening axis (λ3) the hand-sample mean IRM stays parallel to λ3 during deformation. However, individual magnetization directions are deflected towards the flattening plane, and thus the specimen directions are scattered by strain. This is accompanied by a significant decrease of magnetization intensity.
(2)|In contrast, when the initial direction of IRM is perpendicular to λ3, the shortening results in a clustering of specimen magnetization directions, the mean direction being unchanged. This is accompanied by a slight increase of magnetization intensity.
(3)|In all other cases, where initial IRM direction makes an intermediate angle with shortening direction, deformation induces a deviation of each specimen IRM toward the flattening plane. This results in an overall deflection of hand-sample mean IRM. The amount of rotation increases with strain intensity. Changes of grouping and intensity depend on the initial angle between IRM and λ3, defining a continuum in behavior between IRM directions being either parallel to λ3 or perpendicular to λ3. Finally, it is shown that all the experimental changes in IRM due to deformation (direction, grouping, intensity) can be modeled by a passive marker rotation of hematite planar particles.
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