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Corridors of crestal and radial faults linking salt diapirs in the Espírito Santo Basin, SE Brazil

Mattos, Nathalia H. and Alves, Tiago Marcos 2018. Corridors of crestal and radial faults linking salt diapirs in the Espírito Santo Basin, SE Brazil. Tectonophysics 728-29 , pp. 55-74. 10.1016/j.tecto.2017.12.025

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Abstract

This work uses high-quality 3D seismic data to assess the geometry of fault families around salt diapirs in SE Brazil (Espírito Santo Basin). It aims at evaluating the timings of fault growth, and suggests the generation of corridors for fluid migration linking discrete salt diapirs. Three salt diapirs, one salt ridge, and five fault families were identified based on their geometry and relative locations. Displacement-length (D-x) plots, Throw-depth (T-z) data and structural maps indicate that faults consist of multiple segments that were reactivated by dip-linkage following a preferential NE–SW direction. This style of reactivation and linkage is distinct from other sectors of the Espírito Santo Basin where the preferential mode of reactivation is by upwards vertical propagation. Reactivation of faults above a Mid-Eocene unconformity is also scarce in the study area. Conversely, two halokinetic episodes dated as Cretaceous and Paleogene are interpreted below a Mid-Eocene unconformity. This work is important as it recognises the juxtaposition of permeable strata across faults as marking the generation of fault corridors linking adjacent salt structures. In such a setting, fault modelling shows that fluid will migrate towards the shallower salt structures along the fault corridors first identified in this work.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Elsevier
ISSN: 0040-1951
Date of First Compliant Deposit: 5 January 2018
Date of Acceptance: 27 December 2017
Last Modified: 01 Jul 2019 15:06
URI: http://orca.cf.ac.uk/id/eprint/107939

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