Magnetic Susceptibility, Anisotropy, Rock Fabric
Although the anisotropy of magnetic susceptibility (AMS) of rocks first called the attention of scientists because of its possible influence on the direction of the remanent magnetization, it was relatively soon realized that the AMS of a rock is in general too weak to exert a noticeable influence in the paleomagnetic record (e.g., Uyeda et al., 1963). On the other hand, due to the close relationship that exists between the crystalline structure of minerals and their AMS (Nye, 1960), it was well established that the AMS should bear a very close relationship with the mineral fabric of the rock. It is therefore not surprising that the modern interest in the study of the AMS of rocks resides mainly in its value as a petrofabric indicator rather than as a paleomagnetic tool.
There are several sources for the AMS of rock. The most common of these sources is the anisotropy arising from the crystalline structure of the minerals (Nye, 1960). Almost all minerals will have an AMS that is...
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