K-Ar dating, geological and paleomagnetic study of a 5-km lava succession in northern Iceland.

Kristján Sæmundsson, Leó Kristjánsson, I. McDougall, N. D. Watkins

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58 Citations (Scopus)

Abstract

A 5-km section of basalt lavas exposed at Trollaskagi on the western flank of the Eyjafjordur structural dome in northern Iceland has been subjected to K-Ar age and paleomagnetic analysis from which detailed results are tabulated (34 dated lavas, 455 paleomagnetic directions). The upper 4km of the sequence was erupted between about 11 and 9 m.y. ago. The rate of growth of the lava pile changed about 9.5 m.y. ago. Growth rates in the lower part were of the order of 1km/my., whereas growth rates in the upper part may have been as high as 4km/m.y. A 1.8km-thick normal polarity interval in the middlepart of the section is correlated with marine magnetic anomaly 5. A good match is observed between the polarity sequence of the Trollaskagi section and the marine magnetic polarity pattern above and below anomaly 5. Regression analysis of the K-Ar data gives an age of 10.5 m.y. for the older boundary of anomaly 5 but a questionable 9.3-m.y. age for its younger limit. -Authors

Original languageEnglish
Pages (from-to)3628-3646
Number of pages19
JournalJournal of Geophysical Research
Volume85
Issue numberB7
DOIs
Publication statusPublished - 10 Jul 1980

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