Abstract
Work along the east coast of Greenland in the summer of 1994 represents the initiation of the Danish Lithosphere Centre (DLC) investigations into the magmatic and tectonic evolution accompanying initial break-up of the North Atlantic in this area. As described by Larsen (this report), the aims of DLC are the understanding of the composition and thermal state of the asthenosphere and the deformation of the lithosphere during continental break-up and formation of volcanic rifted margins. Furthermore, the time scale of these events is crucial to any model of break-up.
Highlights
Work along the east coast of Greenland in the summer of 1994 represents the initiation of the Danish Lithos phere Centre (DLC) investigations into the magmatic and tectonic evolution accompanying initial break-up of the North Atlantic in this area
In addition DLC has proposed deep continental drilling of the continental margin to gain a clearer picture of the structure at depth and, if possible, to recover dense underplated material believed to exist beneath such margins
Seismic images from many such volcanic rifted margins show evi dence for seaward-dipping reflector sequences (SDRS), which are widely regarded as evidence for large volume, subaerial volcanism during extension (Hinz, 1981)
Summary
A major step towards a better understanding of one such margin was taken in August 1994, when DLC collected 1094 km of deep seismic reflection data offshore South East Greenland (Dahl-Jensen et al, 1994; Fig. I). In addition to imaging and mapping the extent of vol canic sequences of the rifted margin, a further goal of the survey is a study of the Precambrian crust of the margin immediately adjacent to the volcanic sequences. For this purpose, a reflection line was collected parallel to the coast from latitudes 60°30' -62°45' N. In this part of the survey, a 75 m shotpoint interval and a recording time of 27 s was used These shots were recorded on land by three seismic stations set up along the coast in order to supple ment the near vertical reflection imaging with some wide angle refraction information. Rellector Sequences ODPdrill site 0 Scheduled ODPdrill site New deep seismic lines
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