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Geological Society, London, Special Publications; 1996; v. 100; p. 259-264;
DOI: 10.1144/GSL.SP.1996.100.01.16
© 1996 Geological Society of London

Physical Modelling

Genesis of large counter-regional normal fault by flow of Cretaceous salt in the South Atlantic Santos Basin, Brazil

P. Szatmari, M. C. M. Guerra & M. A. Pequeno

PETROBRÁS Research Centre, Quadra 7, Cid. Univ., Ilha do Fundão, 21949-900, Rio de Janeiro, RJ, Brazil

The outstanding feature of the Santos Basin is a gigantic landward-dipping listric fault, about 300 km long, which trends NE parallel to the coast and is soled in the Aptian salt. This fault forms the seaward limit of a half-graben, up to 50 km wide and restricted to the post-salt sediments. In the present work we show, by physical modelling, that such a fault can result from the flow of salt in response to progradation of sediments over a spreading salt layer.