Abstract
ABSTRACTThis paper presents a seabed sediments (grain size) map of the Nordland VI area (25,000 km2) off the Lofoten islands, north Norway. The map is based on multibeam echosounder data (bathymetry and backscatter), visual analysis of 215 video transects (each 700-m long), and visual and grain-size analysis of seabed sediment samples from 40 sampling stations acquired by grabs, boxcores and multicores. A total of 14 sediment classes were identified, with sediments varying in grain size from mud to boulders. Seabed types also include bedrock and bioclastic sediments from degrading cold-water coral reefs. The continental shelf is mostly characterised by coarse-grained sediments such as gravelly sand and sandy gravel, especially in till areas. In basins and glacial troughs, finer-grained sediments such as sandy mud and muddy sand dominate. The upper continental slope (300–600-m water depth) is characterised by coarse-grained sediments related to the influence of the strong north-east flowing Norwegian Atlantic Current. In deeper areas, finer-grained sediments are prominent. Below 1000-m depth, mostly mud and mud with sediment blocks occur.
Highlights
The Norwegian seabed mapping programme MAREANO was launched in 2006 in order to improve the knowledge of the Norwegian seafloor
The map is based on multibeam echosounder data, visual analysis of 215 video transects, and visual and grain-size analysis of seabed sediment samples from 40 sampling stations acquired by grabs, boxcores and multicores
MAREANO has acquired a suite of marine data sets such as multibeam bathymetry and backscatter, seabed sediment samples and cores, videos of the seafloor and high resolution sub-bottom profiler data which provide the basis for map production
Summary
The Norwegian seabed mapping programme MAREANO (www.mareano.no) was launched in 2006 in order to improve the knowledge of the Norwegian seafloor. MAREANO mapping includes the Seabed sediments (grain size) maps which form an important basis for biotope maps, and are used by management and industry for planning purposes. Mareano.no/en/maps/mareano_en.html, including the following geological map products: Seabed sediments (grain size), Seabed sediments (genesis), Sedimentary environment, Landscapes and Landforms. To perform this mapping, MAREANO has acquired a suite of marine data sets such as multibeam bathymetry and backscatter, seabed sediment samples and cores, videos of the seafloor and high resolution sub-bottom profiler data which provide the basis for map production
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