Abstract
Morris Jesup Spur and Rise north of Greenland – exploring present seabed features, the history of sediment deposition, volcanism and tectonic deformation at a Late Cretaceous/early Cenozoic triple junction in the Arctic Ocean
Highlights
The marginal submarine structures known as the Morris Jesup Rise north of Greenland and the Yermak Plateau north of Svalbard are symmetric with respect to the Gakkel spreading centre in the Arctic Ocean (Fig. 1)
The flat25 km-wide Morris Jesup Spur is formed by a west-dipping sedimentary succession (0.8 sec. thick) overlying >0.35 sec. ( ̴ 0.7 km) of volcanic rocks truncated at the top by a horizontal unconformity
The rise was the site of volcanic activity from the early Cenozoic to the late Miocene and is framed by a deformation front to the north and west
Summary
The marginal submarine structures known as the Morris Jesup Rise north of Greenland and the Yermak Plateau north of Svalbard are symmetric with respect to the Gakkel spreading centre in the Arctic Ocean (Fig. 1). The major sources of information are airborne magnetic and gravity surveys (Vogt et al, 1979; Kovacs & Vogt, 1982; Brozena et al, 2003; Døssing et al, 2013; Jokat et al, 2016). In this contribution we present the first modern seismic reflection traverse which shows the eastern spur to be a truncated succession of dipping sedimentary and volcanic rocks and the western rise to be made up of deformed sediments and volcanics
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