Forced Folding and Basement-Detached Normal Faulting in the Haltenbanken Area, Offshore Norway
Published:January 01, 1989
Martha O. Withjack, Kristian E. Meisling, Lee R. Russell, 1989. "Forced Folding and Basement-Detached Normal Faulting in the Haltenbanken Area, Offshore Norway", Extensional Tectonics and Stratigraphy of the North Atlantic Margins, A. J. Tankard, H. R. Balkwill
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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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Extensional Tectonics and Stratigraphy of the North Atlantic Margins
Stimulated by the wealth of frontier exploration data and deep seismic surveys about the North Atlantic margins, this publication was crafted to provide a comprehensive analysis of North Atlantic extension. The 40 papers in this volume are divided into 6 sections: concepts, North Atlantic perspectives, North American margins, European-African margins, North Sea and Barents Shelf, and analogs. This book is concerned primarily with the circum-North Atlantic data base. It is largely biased toward presentation and interpretation of data rather than being model driven. The book includes comparative stratigraphic columns for basins of the North Atlantic margins.