NGFs digital lunch seminar with Haakon Fossen
Автор: Norsk Geologisk Forening
Загружено: 2026-02-06
Просмотров: 38
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Abstract:
An impressively extensive shore platform, the strandflat, is cut 20–50 km into hard crystalline bedrock along most of the Norwegian coastline. Its age and origin have been debated for more than a century, including a model that it represents a weathered, buried and re-exposed Triassic surface. Resolving this issue requires integrated examination of the coastal area together with the offshore Mesozoic rift margin. Here I combine new 3D broadband seismic, bathymetric, and onshore elevation data along coastal West Norway and find that the near-horizontal strandflat postdates both the west-sloping onshore “paleic” surface and the offshore Jurassic denudation surface. It also postdates tilted North Sea Neogene sediments. Consistent with low-temperature thermochronologic data, this shows that the strandflat is a Pleistocene geomorphic feature formed through periods of varying climatic conditions, facilitated by preexisting fault and fracture zones. It is not part of an inherited Mesozoic landscape.
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