Abstract

A magnetic anomaly is produced when a rock unit has a magnetic contrast with a laterally adjacent rock unit. The cause of this magnetic contrast might be produced by a change in the magnetic susceptibility and/or magnetic remanence of the source bodies. After Vine and Matthews (1963) demonstrated that magnetic anomalies observed over ocean basins record a chronology of ocean floor generation, it was readily apparent that in some instances the genesis of a magnetic anomaly can be dominated by the remanence component. Surprisingly, few investigators have acknowledged that magnetic remanence can have a similar influence on continental magnetic anomalies. The incorporation of magnetic remanence data into a magnetic inversion scheme continues to present a major problem. In this note, we outline the problem and present some approaches that might be used to derive relevant remanence information.

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