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Pre-23 magnetic anomalies between Jan Mayen and Greenland-Senja fracture zones in the Norwegian sea |
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| Authors: | Terje Hagevang Olav Eldholm Inge Aalstad |
| Institution: | 1. Saga Petroleum A/S, H?vik, Norway 2. Dept. of Geology, Univ. of Oslo, Oslo, Norway 3. Geological Survey of Norway, Trondheim, Norway |
| Abstract: | Analysis of magnetic data between the Jan Mayen and Senja fracture zones indicates that the anomaly 24A-B sequence extends from the Lofoten Basin onto the outer Vøring Plateau. Anomaly patterns, including those on the conjugate margin, suggest that the pre-23 sea floor spreading was characterized by an unstable plate boundary between fracture zones. The pre-23 spreading rate was at least 2.5 cm yr-1 which is remarkably high compared with the post-23 rates. An evolutionary model which assumes Cenozoic oceanic crust as far landward as the Vöring Plateau and Greenland escarpments is suggested. |
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