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Wasilewski et al. (1979) concluded that no magnetic remanence existed in the uppermost mantle and that even if present, such sources would be at temperatures too high to contribute to long wavelength magnetic anomalies (LWMA). However, new collections of unaltered mantle xenoliths indicate that the uppermost mantle could contain ferromagnetic minerals. 1. The analysis of some LWMA over cratons and...
Fresh mantle xenoliths represent an exceptional opportunity to directly access Earth's interior. In particular, magnetic signals carried by upper mantle xenoliths may provide the only opportunity to determine the depth of remanent magnetization below the Moho boundary. In recent years, the nature, intensity and magnetic properties of the magnetic signal have been characterized by measurements of the...
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