Magnetic susceptibility of sedimentary rocks from shallow cores off Mid Norway and crystalline rocks from adjacent onland areas. NAS-94 Interpretation Report Part IIB: Petrophysical data, Revised version

Abstract

This report has been modified from the 'NAS-94 Interpretation Report, Part II: Petrophysical data'. The revised report presents results from 428 magnetic susceptibility measurements on cores from the IKU shallow drilling programme in the Nordland IV, V, VI and VII areas in addition to susceptibility, remanence and density measurements on approximately 4100 bedrock samples from the coastal area of Nordland and North Trøndelag (crystalline basement). Together the measured cores represent a > 1090 m rock column through the Triassic, Jurassic, Cretaceous and Lower Tertiary. The Pleistocene cover has also been measured. The masgnetic susceptibility data have been compared for different lithologies and sediment composition and mineralogical analysis by SEM and XRD methods have been performed in order to identify the mineralogical source of the magnetic properties. These results have been used to aid in interpretation of aeromagnetic measurements from the NAS-94 Project.