Abstract
One of the most common problems in the interpretation of palaeomagnetic data is the presence in rocks of secondary remanent magnetizations acquired after the time of formation, which if not detected and removed prevent the direction of the primary magnetization, and thus the ancient field direction at the site, from being established. The possible origins of secondary NRM are viscous remanent magnetization (VRM), partial thermoremanent magnetization (PTRM), for example during burial and heating of sediments, isothermal remanence (IRM) through lightning strikes and chemical remanence (CRM) through post-depositional alteration and diagenesis. With the exception of IRM these secondary components are aligned along the ambient geomagnetic field at the time of acquisition, with widely different directions possible through field reversals, polar wandering and plate movements.
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