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Fluid flow during early compartmentalisation of rafts: a North Sea analogue for divergent continental margins

Alves, Tiago Marcos and Elliott, Claire 2014. Fluid flow during early compartmentalisation of rafts: a North Sea analogue for divergent continental margins. Tectonophysics 634 , pp. 91-96. 10.1016/j.tecto.2014.07.015

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High-quality 3D seismic data tied to eighteen (18) boreholes are used to investigate the styles of faulting and associated fluid flow features in Triassic–early Jurassic rafts of the Broad Fourteens Basin, Southern North Sea. The study area is presented as an analogue for continental margins experiencing early stage gravitational gliding, i.e. prior to complete separation and downslope translation of individual rafts. In such a setting, and for present-day stress conditions, fault slip data indicate that chasms and faults separating rafts in the Broad Fourteens Basin comprise structures subject to dip slip and strike-slip reactivation. Chasms and faults sub-parallel to these latter chasms comprise the most significant bypass areas for fluid sourced from pre-salt strata. Faults sub-parallel to the main chasms show limited propagation into Early Cretaceous and Cenozoic strata draping the rafts, a character further stressed by the depth of occurrence of fluid pipes and dim spots. This is an important observation, and leads us to postulate that faults formed during early stage rafting control fluid flow in regions where gravitational gliding is limited such as West and Equatorial Africa, Southeast Brazil and parts of the Gulf of Mexico.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Q Science > QE Geology
Uncontrolled Keywords: North Sea; divergent margins; pre-salt; raft tectonics; early stage faulting; fluid flow.
Publisher: Elsevier
ISSN: 0040-1951
Date of Acceptance: 16 July 2014
Last Modified: 27 Feb 2019 14:01

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