Abstract
Abstract The plutonic rocks, sovite ring dykes and alnoite dykes belonging to the (Cambrian) Alnon Complex have been analysed for palaeomagnetic study. Total NRM's residing in magnetite and pyrrhotite are locally very high in the plutonic facies and variable in the sovite dykes; all the alkaline phases have NRM's dominated by low coercivity components. Alternating field demagnetisation isolates a range of remanence directions, but a principal mean of D = 107°, I = 2°(α95 = 9°) in the bulk of the sovite and alnoite dykes is defined by both polarities and confirmed by thermal cleaning. A subsidiary direction of D =350°, I = 15° (α95 = 11°) is recognised predominantly in the plutonic rocks. The data contribute to the sparse Cambrian palaeomagnetic record from the Fennoscandian Shield and support earlier suggestions of large apparent polar wander motion in Cambrian times.
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