Abstract

High-pass filtered aeromagnetic profiles from the Mid-Norwegian continental shelf, displayed as shaded relief versions of color stripes, provide a lucid picture of sedimentary layering and structure not easily displayed by proper application of modern enhancement techniques to images of the gridded aeromagnetic data. We show that when the aim is to analyze anomalies related to sedimentary features, it is more useful to study shaded relief versions of the profile data than to study digitally enhanced images of high-pass filtered or calculated gradient data; a reason for this is probably the loss of high-wavenumber, very low amplitude, information in the gridding process. The reprocessed data sets reveal anomaly patterns that are interpreted to originate from the following magnetic sources: (1) Quaternary overburden and bathymetric features, (2) magnetic sedimentary rocks, the subcropping sedimentary rock units, (3) magnetic basement in the structural highs and in the coastal zone, and (4) igneous intrusives at relatively deep levels within sedimentary basins. West of the basement rocks along the coast, the subcropping wedge of Mesozoic to Tertiary sediments is characterized by a distinct set of subparallel anomalies. Also, sedimentary layering within the Tertiary can be resolved. Short to intermediate wavelength anomalies correlate with the Late Jurassic faults of the Halten Terrace.

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