ORIGIN OF THE DE LONG RISE, EAST ARCTIC

Abstract

The tectonics of the East Siberian Sea shelf remains a matter of debate because of its poor geological coverage based on the on-land observations of a small number of islands (Lyakhovsky, New Siberian, and De Long archipelagoes) and scanty geophysical data. The consideration of gravity measurements and aeromagnetic maps in combination with sporadic seismic reflection lines made it possible to delineate the De Long Rise. The results of on-land geological studies primarily concerning magmatism constrained the timing of this rise to the Middle Cretaceous–Pleistocene.