Abstract
Beneath the Arctic Ocean, the Alpha Ridge complex is the principal tectonic feature between the Canada Basin and the Lomonsov Ridge. Here we report on analysis of seismic refraction data along the Alpha Ridge and within the basin area 175 km to the north (Fig. 1), which, together with geological and aeromagnetic constraints, indicates that the Alpha Ridge is characterized by regions of continental-like thickness but has probably resulted from an oceanic mode of development. The ridge flank thins towards the North Pole but may extend as far north as 88° N, and is therefore >500 km wide in the region near 110° W. Consequently, south of the pole along 110° W, typical oceanic crust beneath the eastern Makarov Basin may be present only locally, if at all. Similarities between the velocity structures of the Alpha Ridge and the Iceland area suggest that the Icelandic structure may be a currently active analogue for the Alpha Ridge.
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