A proposed granite batholith along the western flank of the North Sea Viking Graben |
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| Authors: | J A Donato M C Tully |
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| Institution: | Hydrocarbons Unit, Institute of Geological Sciences, 19 Grange Terrace, Edinburgh;Marine Geophysics Unit, Institute of Geological Sciences, Murchison House, West Mains Road, Edinburgh |
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| Abstract: | Summary. A pronounced positive magnetic anomaly of approximately 300 gamma occurs over the eastern edge of the East Shetland Platform at approximately 60°N, 1°E. After the removal of the regional gravity variation and the gravity effect of the known geological structure, it is found that this magnetic high correlates with a negative gravity residual anomaly of approximately 30 mGal. Seismic data indicate that these anomalies occur in an area of relatively shallow basement on the upthrown side of the main Viking Graben margin fault. The presence of a buried granite batholith of approximately 40 × 40km may explain the gravity, magnetic and seismic observations. The observed deviation of the fault defining the edge of the Viking Graben in the proximity of the proposed granite may be explained in terms of the tectonic influence of the buoyant granite block during the taphrogenic development of the graben. |
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