Abstract
The interpretation of reflection seismic data in the Kattegat has revealed the combined effect of tectonic movements which took place from Pre-Jurassic through recent times.A continuation of the Fennoscandian Border Zone in Scania occupies a broader belt of more deep-seated basement-related fault blocks in the Kattegat area, but fades away towards NW. A mainly Jurassic sill striking SSW from Anholt separates the Kattegat area in partially open basins of Cretaceous deposition. In the 0resund several large north-northwest striking basement-related faulted blocks appear to be associated with the tectonics of the Fennoscandian Border Zone.The most prominent features relating to the structures and the geological history of the Fennoscandian Border Zone have been outlined.Some details connected with the Pre-Quaternary outcropping for the area have been evaluated. Katholm-erratics containing "Cyrena" fossils from the Kattegat area are not of Lower Oligocene age, but from Upper Jurassic and are most probably originate from the Anholt area.One of some structural models for northwestern Europe has been advanced for verification. Parts of the Fennoscandian Border Zone have perhaps been affected by large-scale dextral fractures.
Highlights
The areas formed by the shallow waters of the Kattegat, the so uthern 0resund and western 0sterso have been interpreted seismically for the main part, but the mapping of all the geological horizons has not been completed
The Fennoscandian Border Zone This Border Zone forms a tectonically disturbed area which acted as a buffer zone between a mainly subsiding Danish Embayment and a more stable Fennoscandian Shield
The 0resund is characterized by several large N. to N.W. striking basement-related fault blocks of the Lower Palaeozoic section which appear to be associated with the tectonics of the Fennoscandian Border Zone
Summary
The areas formed by the shallow waters of the Kattegat, the so uthern 0resund and western 0sterso have been interpreted seismically for the main part, but the mapping of all the geological horizons has not been completed. The interpretation is mainly based on exploratory reflection work, which was carried out by several contractors on behalf of the Danish American Prospecting Company (D.A.P.Co.) in the period 1946- 1957, and of Gulf Oil Company of Denmark Ltd. during 1957-1969. The results of refraction surveys which were occasionally carried out by one party in the North Jylland Salt Dome Province in the periods 19391940 and 1946- 1952 could be used for velocity information in regions with shallow, high speed material. Bouguer gravity maps (Gulf Oil Co. of Denmark, 1938- 1940 and 1946- 1949) and Residual Gravity Maps of the land areas, which were interpreted by Dr S. Sjrelland) by means of computer, since no well-velocity logs or surveys of these wells were available
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