SAS-96 Part II, Skagerrak Aeromagnetic Survey 1996, Interpretation Report

Abstract

Fortrolig til 2002 Potential field data in the Norwegian-Danish Basin have been interpreted. The aeromagnetic anomaly patterns is found to represent three types of magnetic sources: 1) Deep magnetic basement 2) Permian volcanics and intrusives, and 3) Buried sand channels of Quaternary age. The positive gravity effect from the shallow Moho below the Norwegian-Danish Basin is not sufficient to com- pensate for the highly reduced gravity effect from the light sediments within the basin. More dense material has to be introduced at depth in the crust below the deepest part of the westermost Norwegian-Danish Basin and get thin- ner towards the east. The basement depth of the bulk of the Norwegian-Danish Basin varies between 6 and 8 km. Depths between 3 km and 9 km were obtained along the Farsund Basin, and the magnetic anomaly pattern indicates a complex system of fault blocks along the Sorgenfrei-Tornquist Zone.