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Geological Society, London, Special Publications; 2002; v. 203; p. 259-276;
DOI: 10.1144/GSL.SP.2002.203.01.14
© 2002 Geological Society of London

Geomorphology of buried glacigenic horizons in the Barents Sea from three-dimensional seismic data

B. Rafaelsen1, K. Andreassen1, L. W. Kuilman2, E. Lebesbye1, K. Hogstad3 & M. Midtbø4

1 Department of Geology, University of Tromsø, N-9037 Tromsø, Norway bjarne{at}ibg.uit.no
2 Norsk Hydro ASA, 0246 Oslo, Norway
3 Norsk Hydro ASA, 9480 Harstad, Norway
4 Norsk Hydro ASA, Pb. 7190, 5020 Bergen, Norway

The glacigenic sequence of the southwestern Barents Sea shelf has for the first time been studied using 3-D seismic data. The close spacing of 3-D lines and powerful computer workstation interpretation techniques have allowed detailed mapping of the observed features. Several generations of subglacial lineations observed on four different palaeo-surfaces are interpreted to reflect the flow patterns of palaeo-ice sheets. To our knowledge, this is the first time that multiple levels of subglacial lineations have been observed. The lineations are 2.5–8 m in relief, 50 to 180 m wide and 0.5 to 20 km long. All four surfaces show a main lineation pattern comprising lineations with a N-S trend, suggesting that the dominant ice flow was directed northwards across the Barents Sea shelf at least four times during the last 0.8 Ma. Two of the surfaces display semi-circular to oblong depressions trending mainly in the same direction as the sub-parallel lineations. These depressions are 9–53 m in relief, 1.25–3.2 km wide and 1.9–9 km long. In contrast to the buried surfaces, the sea floor is dominated by 2.5–25 m deep cross-cutting iceberg plough-marks from the deglaciation phase of the last Barents Sea ice sheet. The 3-D seismic data are conventional industry data. Despite relatively low seismic frequencies and, hence, limited vertical resolution of seismic profiles, time slices and sub-horizontal time maps are of high spatial resolution, providing detailed images of different stages of buried Quaternary glacial geomorphology.





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C. A.-L. Jackson
Application of three-dimensional seismic data to documenting the scale, geometry and distribution of soft-sediment features in sedimentary basins: an example from the Lomre Terrace, offshore Norway
Geological Society, London, Special Publications, 2007; 277: 253 - 267.
[Abstract] [PDF]