Abstract
The West Spitsbergen Fold Belt is the result of a E-W- to ENE-WSW-oriented compression which affected the whole of Spitsbergen. A Late Cretaceous-Palaeocene age for the fold belt deformation is indicated by the involvement of only the basal Tertiary conglomerates in the folding and thrusting. In western Spitsbergen, this compressional event was followed by a strike-slip stress pattern with NW-SE-oriented extension and NE-SW compression which generated micro-structures within the Tertiary rocks. On the map scale, normal faults produced by a NE-SW-oriented extension overprint the compressional structures. The later strike-slip and extensional stress patterns correspond to the Svalbard-Greenland dextral motion, along the De Geer zone, in Latest Palaeocene-Eocene time. The latest tectonic event which affected the whole of Svalbard was an E-W-oriented extension related to the spreading along the Knipovich Ridge in Oligocene-Neogene time.
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