Palaeomagnetic measurements of the Arendal diabases show that two of the four dike systems investigated give a pole position corresponding to Permian age. The other two dike systems were found to have been greatly affected by post-Permian remagnetization. This result is compared with the results obtained from other Permian dikes in southeastern Norway. Tertiary or late Mesozoic volcanic activity in the North Sea area is believed to be responsible for the remagnetization.
On the palaeomagnetism of the Arendal diabases