Basin inversion by James G. Buchanan, Peter G. Buchanan

By James G. Buchanan, Peter G. Buchanan

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Pre-existing basins and scale of deformation Typically, earlier extensional or rift basins with bounding normal faults are subject to later inversion (Fig. 2). In such basins formed by pure shear, coincident thinning of the lithosphere creates areas of weakness that are selectively shortened and inverted. In simple shear lithospheric thinning also occurs, but the locus of thinning is offset from the overlying basin and it is probable that a mechanical detachment surface guides basin inversion (Gibbs 1987).

P. 1987. The structure of the West Orkney basin, northern Scotland. Journal of the Geological Society, London, 144, 871-884. EVANS, C. D. R. 1990. The geology of the Western English Channel and its western approaches. British Geological Survey, United Kingdom Offshore Regional Report. HMSO, London. , CHESHER,J. , DEEGAN,C. E. & FANNIN, N. G. T. 1982. The offshore geology of Scotland in relation to the IGS shallow drilling programme, 1970-1978. Institute of Geological Sciences, Report 81/12. HMSO, London.

5) have been proposed for basins north of Scotland (Cheadle et al. 1987; Enfield & Coward 1987). 5 (Barton & Wood 1984). 0 (Tate et al. 1993). 5 can give rise to sediment-loaded post-rift subsidence of c. 2 km (Jarvis & McKenzie 1980; Fig. 2). Shorter rifting periods give rise to greater amounts of post-rift subsidence. e. syn-rift) Permo-Triassic sedimentary rocks crop out close to the surface and the predicted post-rift subsidence is absent (Jenner 1981; Evans et al. 1982; Enfield & Coward 1987; Kirton & Hitchen 1987; Roberts 1989).

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