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Geological Society, London, Special Publications; 1989; v. 44; p. 123-129;
DOI: 10.1144/GSL.SP.1989.044.01.08
© 1989 Geological Society of London

Inversion in the Alps and Alpine Foreland

Notes and cross-sections illustrating inversion tectonics in the Wessex Basin

I. R. Simpson, M. Gravestock, D. Ham, H. Leach & S. D. Thompson

British Petroleum Development Ltd, Britannic House, Moor Lane, London EC2Y 9BU, UK
British Petroleum Development Ltd, PO Box 2749, Jakarta Selatan, Indonesia
British Petroleum Development Ltd, Britannic House, Moor Lane, London EC2Y 9BU, UK
Standard Oil Production Company, 5151 San Felipe, PO Box 4587, Houston, Texas, USA
British Petroleum Development Ltd, 10 Quai Paul Doumer 92412, Courbevoie Cedex, Paris, France

Four cross-sections based on seismic and well data illustrate the Tertiary inversion tectonics in the Wessex Basin. Inversion is concentrated in Early Cretaceous depocentres with Permian and Triassic depocentres undergoing limited uplift. In the Portland—South Wight Basin inversion formed a northward facing monocline with a major reverse fault in the S. In contrast, in the Weald Basin a broad arch of 50 km wavelength was formed. Both basins show an overall uplift of 1.5 km. These variations in inversion style are probably a function of the geometry of the basin-controlling faults and underlying detachments.





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