Lower Tertiary volcanic rocks off Kristiansund — Mid Norway |
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Authors: | Tom Bugge Tore Prestvik Kåre Rokoengen |
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Affiliation: | 1. Continental Shelf Institute, Håkon Magnussonsgt. 1B, 7000 Trondheim Norway;2. Department of Geology, University of Trondheim, 7034 Trondheim-NTH Norway |
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Abstract: | Grab samples from the Norwegian continental shelf show that diapiric structures occurring within a sequence of Mesozoic and Tertiary sediments represent volcanic rocks consisting of porphyritic olivine-nephelinite. The KAr age of 55.7 ± 0.9 m.y. shows that the area affected by Lower Tertiary magmatism in the North Atlantic region also included the continental shelf off Mid Norway. The highly undersaturated nature of these volcanic rocks, however, indicates that they are unlikely to be closely related to the widespread tuff horizons of the same age known from the North Sea. |
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