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Geological Society, London, Memoirs; 2004; v. 29; p. 133-142;
DOI: 10.1144/GSL.MEM.2004.029.01.13
© 2004 Geological Society of London

Structural and Igneous Geology

Three-dimensional geometry and displacement configuration of a fault array froma raft system, Lower Congo Basin, Offshore Angola: implications for the Neogene turbidite play

David M. Dutton1,3, Dustin Lister1,4, Bruce D. Trudgill1,5 & Kapela Pedro2

1 Department of Earth Sciences and Engineering, Imperial College, , RSM Building, Prince Consort Road, South Kensington, London SW7 2BP, UK (e-mail: david.dutton{at}ic.ac.uk)
2 Sonangol DPP, Rua 1° Congresso do MPLA, N.° 8-16, , Caixa Postal 1316, Luanda, Republica de Angola
3 Present address: CNR International UK Ltd, St Magnus House, , Guild Street, Aberdeen ABU 6NJ, UK (e-mail: david.dutton{at}cnrinternational.com)
4 Present address: WesternGeco, Schlumberger House, Buckingham Gate, Gatwick Airport, , West Sussex RH6 ONZ, UK
5 Present address: Colorado School of Mines, , Illinois 1500 Street, Golden, CO 80401-1887, USA

We investigate fault growth and linkage during development of a rafted terrain in the Lower Congo Basin, offshore Angola. Miocene thin-skinned extension has led to the development of isolated raft blocks separated by a graben filled with syn-deformational strata. Angular unconformities together with thinning and onlapping of intra-raft strata onto salt bodies suggest that thick salt was mobile during thin-skinned extension. 3D fault array geometries and displacement patterns record the subsequent deformation history of the graben during further thin-skinned extension. The mode of thin-skinned extension has important consequences for the Neogene turbidite hydrocarbon play associated with the rafted province of the Lower Congo Basin. The presence of thick mobile salt will influence pre-salt source rock maturation and the development of pre-salt/post-salt hydrocarbon migration windows.