Abstract
The palaeomagnetic signal of rocks arises mainly due to the presence of Fe-bearing oxide solid solutions with the spinel crystal structure (such as the titanomagnetites). The ability of these minerals to acquire a strong and stable remanent magnetization in the presence of the Earth's magnetic field is determined to a large extent by their Curie temperature (Tc), saturation magnetization (Ms), coercivity (Hc), and remanence (Mrs). Tc and Ms). are determined mainly by the fundamental crystal chemical state of a mineral, which is effected by the processes of cation ordering, magnetic ordering, and subsolvus exsolution. Hc). and Mrs). are determined mainly by the microstructure of the mineral, which is also a function of the cation ordering and subsolvus exsolution processes. This paper reviews recent developments in the theoretical description and experimental observation of these processes in Fe-bearing spinel solid solutions and describes the magnetic and palaeomagnetic consequences of the interaction between them.
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