Abstract
During interpretation of low-altitude aeromagnetic and ground magnetic measurements linear magnetic minima are frequently observed. They are often attributed to linear fracture zones. Detailed petrophysical studies have been made on an outcropping fracture zone showing a negative magnetic anomaly. The magnetic susceptibility has been measured in situ and the variable content of opaque minerals has been studied in polished sections. It was found that the observed linear magnetic minima are caused by a combination of a fault graben and the oxidation of magnetite to hematite. The latter effect is dominating and the alteration process (martitization) is shown on a susceptibility—Q-value diagram.
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