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Abstract

Triassic evaporites strongly influenced the structural development of the Haltenbanken area of off-shore Norway during Late Jurassic and Early Cretaceous time by mechanically decoupling Triassic and younger strata from older strata and basement. Many folds in the Haltenbanken area are forced folds above basement-involved normal faults. Seismic data show that they are asymmetric flexures affecting Triassic, Jurassic, and Lower Cretaceous strata above the evaporites. They commonly are cut by, or die out along strike into, basement-involved normal faults. Extensional forced folds formed, at least in part, because Triassic evaporites behaved in a ductile manner, decoupling overlying strata from underlying faulted strata and basement. Many normal faults in the Haltenbanken area are basement-detached faults that flatten within the Triassic evaporites. Seismic data show that rollover anticlines and secondary normal faults affect Triassic, Jurassic, and Lower Cretaceous strata within the hanging walls of Thèse basement-detached normal faults. Strata beneath the Triassic evaporites are unaffected by this deformation.

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