Abstract
A magnetopolarity stratigraphy has been constructed by detailed palaeomagnetic investigations of a well-core covering the Middle Jurassic Brent Group, North Sea. These high time resolution results have provided a chronostratigraphic framework which has been correlated tentatively with the reported magnetopolarity stratigraphy based on a pelagic limestone sequence from Caracabuey, southern Spain. Biostratigraphic datings suggest the same age-span as the magnetopolarity results. The sediments, which range from mudstone to coarse sandstone, have a very low content of ferrimagnetic minerals. Remanent coercivity analysis suggests that magnetomineralogy is facies and grain-size independent, and pyrrhotite is the most likely main magnetic remanence-carrying mineral. Palaeomagnetic analysis of the core specimens indicates mostly multicomponent magnetization. The characteristic remanent magnetization is inferred to be a combination of post-depositional detrital remanent magnetization and a dominant early chemical remanent magnetization.
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