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Nature of Palaeozoic extension in Lofoten, north Norwegian Continental Shelf: insights from 3‐D seismic analysis of a Cordilleran‐style metamorphic core complex

2014; Wiley; Volume: 26; Issue: 3 Linguagem: Inglês

10.1111/ter.12098

1365-3121

Gijs A. Henstra, Atle Rotevatn,

Geological and Geophysical Studies

Abstract Analyses of 3‐D seismic data reveal that pre‐Triassic basins are present underneath the Mesozoic North Træna Basin (Lofoten Margin, Norway). These are linked to a Cordilleran‐style metamorphic core complex that developed in Palaeozoic times, including rotated fault blocks with hanging wall ‘growth’ wedges, bounded by listric faults that sole into a sub‐horizontal detachment. On the basis of similarity in age, structural style and transport direction, we propose a kinematic link with a Permian mylonitic detachment documented onshore. This study presents the first offshore evidence for Palaeozoic detachment faulting, elucidating the mechanisms behind the long‐lived exhumation history of the Lofoten basement.