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A palaeomagnetic study of the intrusions and Carboniferous sediments at Dunbar, Scotland

Synopsis Gently tilted Lower Carboniferous sediments on the Dunbar foreshore are intruded by a 20 m thick dyke and a subparallel narrow dyke. Heating by the Big Dyke can be traced for 80 m, but the strongly altered Small Dyke only has a 1 m aureole. The Big Dyke remanence differs from that of the unheated sediments, which show similar directions to the Small Dyke. The sequence of superimposed components in the aureole of the Small Dyke suggest that the remanence of the unheated sediments is oldest, followed by the baking effect of the Big Dyke and then by the Small Dyke. This implies a Lower Carboniferous age for the magnetization of the sediments and the Big Dyke, and a Permian age for the Small Dyke. However, the corresponding pole positions suggest Permian ages for the sediments and Small Dyke, and Lower Carboniferous for the Big Dyke. Only the reversed pole (23°S 341°E) for the Big Dyke appears to be substantiated.