Abstract
The paper discusses geophysical phenomena observed over tholeiitic dykes detected in the Eastern Desert of Egypt (Nubian Block). The dykes show specific physical properties and are either normally or reversely polarized along their whole length over 120 km. Dykes of similar properties may also be interpreted from airborne geophysical maps in Saudi Arabia (Arabian Block). Magnetic fields of the tholeiitic dykes were interpreted quantitatively: they fit the magnetic pattern over the Red Sea. The study emphasizes those geophysical phenomena which may serve as criteria for recognition of regions with rift tectonics development.
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