Intraplate Stresses and the Tectono-Stratigraphic Evolution of the Central North Sea
Published:January 01, 1989
H. Kooi, S. Cloetingh, 1989. "Intraplate Stresses and the Tectono-Stratigraphic Evolution of the Central North Sea", Extensional Tectonics and Stratigraphy of the North Atlantic Margins, A. J. Tankard, H. R. Balkwill
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We present results of stratigraphic modeling and quantitative analysis of subsidence data for the central North Sea basin. Tectonic subsidence curves are given for 15 wells in the southern part of the Central graben. Subsidence analysis and thermomechanical modeling show that Late Jurassic and Early Cretaceous multiple stretching phases with a finite duration are required to explain the observed stratigraphic record. Our analysis demonstrates that intraplate stresses are not only important for basin formation, but also play a significant role in the subsequent evolution of the North Sea basin. Strong deviations from thermally induced subsidence, probably caused by late-stage compression, are observed for the late Neogene. Ignorance of the vertical motions of the lithosphere induced by late-stage compression during postrift evolution can produce substantial errors in estimates of crustal extension derived from analysis of basement subsidence using stretching models. Quantification of the subsidence caused by postrift compression has important implications for extensional models of basin subsidence. The paleostress curve inferred from the stratigraphic modeling shows a trend with a change from tensional and neutral stresses during Mesozoic times to a stress regime of more overall compressional character during Cenozoic times. Superimposed on this long-term trend are short-term stress fluctuations. This paleostress curve and the associated stratigraphic record of the North Sea basin sheds light on the record of paleostress measurements in the northwestern European platform and is consistent with data on the kinematic evolution of the Tethys belt. Thèse findings demonstrate the key importance of tectonics and stress-induced vertical motions related to rifting events in the northern Atlantic region and the interaction of the Eurasian and African plates in controlling the stratigraphic evolution of the North Sea basin.
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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.