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

Abstract

This report presents results from 1659 magnetic susceptibility measurements on cores from the IKU shallow drilling programme in 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 > 1900 m rock column through the Upper Permian, Triassic, Jurassic, Creta- ceous, and Lower Tertiary. The Pleistocene cover has also been measured. The magnetic susceptibility data have 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 aeromag- netic measurements from the NAS-94 Project.