ИСТИНА

Hebron magnetic anomaly is the greatest magnetic anomaly observed in the territory of Israel. Some investigators have associated this anomaly with the magnetic sources occurring at comparatively small depths (5-7 km). Quantitative analysis of airborne data (1000 m over the Earth's surface) indicates that the upper edge of the magnetic anomalous body occurs at a depth of 26-28 km. A rough estimation of the lower edge occurrence is estimated at a depth of about 40 km. The calculated magnetization of this body is about 3000 mA/m. Developed maps of the Moho and Curie discontinuities suggest that the corresponding surfaces in the region are located at the depths of 29-30 and 40-40.5 km, respectively. Thus, the upper edge of this body is located 3 km above the Moho boundary, and the depth of the lower edge of this body and the maximum possible depth of magnetic source occurrence practically coincide. The recently performed magnetic balloon measurements at the level of about 30 km enabled a preliminary estimate of the depth of the upper edge of the anomalous body as 31 km. Tectonically area of the Hebron anomaly is a collision zone between the Judea-Samaria and Negev terranes. In this area, several deep (~ 5-6 km) boreholes were drilled and constructed sequence formation maps show that the Judea-Samaria terrane was subducted under the Negev terrane. It is known that collision zones are characterized by specific geodynamic crust-mantle instability. Thus, we can propose that the Hebron magnetic anomaly is caused by the mantle diapir.