STRUCTURE AND SEISMIC STRATIGRAPHY OF THE GRIPTARANE AREA, MORE BASINMARGIN, MID-NORWAY CONTINENTAL-SHELF

The Mesozoic succession on the landward side of Griptarane, offshore m id-Norway, reflects an upward change from Lower Jurassic alluvial depo sits to Middle Jurassic marine/continental deposits into Upper Jurassi c-Lower Cretaceous marine deposits. In the latest Jurassic there was d eposition of submarine fans along faults associated with major extensi onal deformation and fault block rotation, probably in Volgian times. This phase coincided with NW-SE extension and rifting in the Slorebotn Sub-basin and at Haltenbanken. An onlap surface is interpreted to rep resent the Kimmerian unconformity and to mark the approximate position of the Jurassic-Cretaceous boundary. Some WNW-ESE- to E-W-oriented fa ults exhibit reverse movements, while E-W-trending folds indicate N-S compression. This compression is interpreted to coincide with a late E arly Cretaceous phase of sinistral transpression in the Gossa High and Slorebotn Sub-basin, and inversion and doming in the More and Voring Basins. The predominance of WNW-ESE- to NW-SE-and ENE-WSW- to NE-SW-tr ending structures indicates that the Griptarane area has been influenc ed by the stress regimes of the More-Trondelag Fault Complex as well a s the stress regimes in the regions further offshore. (C) 1998 Elsevie r Science B.V. All rights reserved.