Structuring of the Northern Viking Graben and the Møre Basin; the influence of basement structural grain, and the particular role of the Møre-Trøndelag Fault Complex
1999; Elsevier BV; Volume: 16; Issue: 5 Linguagem: Inglês
10.1016/s0264-8172(99)00006-9
ISSN1873-4073
AutoresRoy H. Gabrielsen, Tore Odinsen, Ivar Grunnaleite,
Tópico(s)Geological Studies and Exploration
ResumoA comparison between structural histories of the Møre Basin of the Mid Norwegian shelf and the northernmost Viking Graben of the northern North Sea, suggests that the basement structural grains of the two areas are not entirely similar. However, considerable differences in timing and stretching magnitudes occur. These differences are clearly seen by Permian times, as contrasting stretching estimates are obtained for this period. The contrasts were even more pronounced in the Triassic–Cretaceous when extension was initiated earlier and terminated later in the Møre Basin area than in the northern Viking Graben. Furthermore, relatively pronounced late early Cretaceous and (?)Oligocene-Miocene inversion, which affected the Møre Basin, cannot be identified in the northern Viking Graben. Two reasons for these differences are proposed: firstly, the two basins are separated by segments of the Møre-Trøndelag Fault Complex, and secondly, they had different positions in relation to the opening of the North Atlantic. The Møre-Trøndelag Fault Complex has been active during changing stress conditions since the Palaeozoic, and a correlation between dated events in the onshore part of the fault complex correlates well with the observations made in the offshore basins. This emphasises the regional significance of the Møre-Trøndelag Fault Complex, and seismic activity in the area suggests that the fault complex is still active.
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