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A palaeomagnetic study of lower Tertiary lavas in E Greenland and comparison with other lower Tertiary observations in the northern Atlantic

Summary Rock samples from five separate profiles, totalling 2.3 km, in the E Greenland lower Tertiary plateau basalts exhibit well-defined magnetic vectors and stability to both alternating magnetic fields and thermal demagnetization. Stability is confirmed by baked-contact evidence and the preservation of a secular variation record. The remanences are all of reversed polarity and the age relationships suggest that these were acquired during chron C24R, immediately prior to the formation of oceanic magnetic anomaly 24. Radiometric age determinations from the N Atlantic Igneous Province suggest that the plateau basalts of E Greenland may be of similar age to those of the Faeroes, but differ in age from those of the British Tertiary Igneous Province. Palaeomagnetic pole positions for each province suggest an age similarity between the Faeroes and British plateau basalts, while their age relationship to the E Greenland basalts is not clear. The pole positions generally confirm the published continental reconstructions for this period. The simplest polarity solution is for the magnetization of the British and Faeroes basalts to be predominantly associated with chrons C24R and C26R, with only chron C24R being represented in E Greenland. However, this model is dependent on the radiometric constraints on the Palaeocene/Eocene boundary.