Continental Extension in Southern Britain and Surrounding Areas and Its Relationship to the Opening of the North Atlantic Ocean
Published:January 01, 1989
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R. Andrew Chadwick, Roy A. Livermore, Ian E. Penn, 1989. "Continental Extension in Southern Britain and Surrounding Areas and Its Relationship to the Opening of the North Atlantic Ocean", Extensional Tectonics and Stratigraphy of the North Atlantic Margins, A. J. Tankard, H. R. Balkwill
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The development of Permian to Cretaceous sedimentary basins in southern Britain was profoundly controlled by the extensional reactivation of Caledonian and Variscan structural features. Analysis of fault kinematics and basin geometries indicates that Permian to early Jurassic basins developed within a region of roughly east-west continental extension, as Pangea was stretched. In late Jurassic and early Cretaceous times regional east-west extension continued, but the sedimentary basins of southern England developed a different structural aspect, suggestive of more northward-directed extension, probably related to rotation of Iberia and opening of the Bay of Biscay. Two plate-tectonic reconstructions for end-Carboniferous time are examined. One is based on a best fit of apparent polar wander path data; the other is a best fit of present-day continental-shelf isobaths. The former requires 42% continental extension between Europe and Canada prior to the onset of sea-floor spreading in mid-Cretaceous times, whereas the latter requires only 16% extension prior to the onset of sea-floor spreading. Preserved sediment thicknesses and sea-water depths on the continental shelves of north-western Europe and eastern Canada indicate that an end-Carboniferous plate reconstruction based on the fit of shelf isobaths is most appropriate.
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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.