Northeastern Brazilian margin: Regional tectonic evolution based on integrated analysis of seismic reflection and potential field data and modelling

Blaich, Olav A.; Tsikalas, Filippos; Faleide, Jan Inge

doi:10.1016/j.tecto.2008.02.011

Cited by 58 publications

(60 citation statements)

References 73 publications

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“…The Bouguercorrected gravity field also reveals a prominent negativepositive gradient character (Figure 2d). This has previously been interpreted as the COB location [Karner and Driscoll, 1999;Blaich et al, 2008]; however, in a recent study Blaich et al [2010] clearly indicated that this is not necessarily the case.…”

Section: Margin Settingmentioning

confidence: 87%

“…[18] The earlier defined COB location along the northeastern Brazilian margin, coinciding with a prominent Bouguer-corrected gravity high [Karner and Driscoll, 1999;Blaich et al, 2008], is found to be closely related to the transition from the thinned continental domain to the transitional domain rather than to the COB location ( Figure 3a) [Blaich et al, 2010]. Furthermore, a prominent listric normal fault appears to be associated with this boundary (Figures 3a-3c).…”

Section: Continent-ocean Transitional Domainmentioning

confidence: 92%

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Crustal breakup and continent-ocean transition at South Atlantic conjugate margins

Blaich¹,

Faleide²,

Tsikalas³

2011

J. Geophys. Res.

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[1] Seismic reflection and refraction profiles, and potential field data, complemented by crustal-scale gravity modeling and plate reconstructions are used to study the evolution of the central and south segments of the South Atlantic conjugate margins. The central segment is characterized by a hyperextended continent-ocean transitional domain that shows evidence of rotated fault blocks and a detachment surface active during rifting. A polyphase rifting evolution mode, associated with a complex time-dependent thermal structure of the lithosphere, is substantiated for the central segment that is not a "magma-poor" end-member. Increase of volcanic activity during the late stages of rifting may have "interrupted" the extensional system implying a failed exhumation phase that was replaced instead by continental breakup and emplacement of fully igneous crust. The continent-ocean transitional domain along the "magma-dominated" south segment is characterized by a large volume of flood basalts and high-velocity/high-density lower crust. The northern province of the south segment is characterized by symmetrical seaward-dipping reflections and symmetrical continent-ocean transitional domain. The influence of the Tristan da Cunha plume on this province is very likely. The central province of the south segment is characterized by along-strike tectonomagmatic asymmetry, which can be caused by the initial continental stretching and accompanying magmatism rather than by the subsequent seafloor spreading. The Tristan da Cunha plume on the central province may have influenced the volume of magmatism but did not necessarily alter the process of rifted margin formation, implying that the central province of the south segment may have much in common with "magma-poor" margins.

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Section: Margin Settingmentioning

confidence: 87%

Section: Continent-ocean Transitional Domainmentioning

confidence: 92%

Crustal breakup and continent-ocean transition at South Atlantic conjugate margins

Blaich¹,

Faleide²,

Tsikalas³

2011

J. Geophys. Res.

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150

174

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“…The majority of this work has focused on the Angola, Congo, and Gabon Basins (Africa), and their counterparts: Santos, Campos, Recôncavo, SergipeAlagoas, and Pernambuco Basins (Brazil) (Meyers et al, 1996;Karner & Driscoll, 1999;Blaich et al, 2008Blaich et al, , 2010Blaich et al, , 2011Aslanian et al, 2009;Lentini et al, 2010). However, none of these studies did address the characteristics of the Brazilian continental margin region located between the Pernambuco Shear Zone (PESZ) and the Touros High (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The location of the continent-ocean boundary (COB) in this region was defined by a number of authors, mainly based in the analysis of regional geophysical data (Meyers et al, 1996;Karner & Driscoll, 1999;Gomes, 2005;Blaich et al, 2008;Aslanian et al, 2009), although there is considerable debate about this matter. Fainstein & Milliman (1979) suggested that the COB was relatively close to the platform-slope boundary in our study region.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Ocean-Continent Transition in the Paraíba Basin and Natal Platform Region, Ne Brazil

Magalhães¹,

Barbosa²,

Oliveira³

et al. 2014

Rev. Bras. Geof.

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ABSTRACT. Several studies have tried to address the evolution of the Atlantic conjugate margins, including Brazil and West Africa. However, past research advances has been hindered by a lack of data for the marginal region in the eastern portion of northeastern Brazil, extending from the Pernambuco Shear Zone to the Touros High. This situation has imposed serious limitations on the development of a regional view of the paleotectonic and paleogeographic evolution of the margin in this area and on correlations with regional counterparts in Africa. Here, we present an investigation using regional seismic and potential field data. The results show that this region represents a basement high forming a narrow platform with a thin sedimentary cover (0.8-2.5 km) and an abrupt shelf break, which created a large bypass zone towards the slope. The analysis of a deep seismic section revealed that thinned continental crust (transitional crust) occupies a narrow zone and that the continentaloceanic boundary (COB) is located approximately 100 km to the east of the present coastline. Geophysical modeling integrated with interpretation of the seismic data suggests that this region is characterized by an abrupt thinning of continental crust, with an accompanying sudden rise of the Moho. There are also indications for the existence of a zone of extremely thinned continental crust, which was interpreted as proto-oceanic crust. Our findings suggest that the study area shows strong similarities to non-volcanic rifted margins.Keywords: Paraíba and Natal Platform Basins, continental-oceanic transition, northeastern Brazilian continental margin, Atlantic rift. RESUMO.Vários trabalhos têm tentado abordar a evolução das margens conjugadas do Atlântico, incluindo o nordeste do Brasil e o oeste daÁfrica. Entretanto, o avanço de pesquisas anteriores tem sido dificultado em razão da falta de dados na região marginal da porção oriental do nordeste do Brasil, aárea entre a Zona de Cisalhamento de Pernambuco e o Alto de Touros. Este fato tem imposto limitações ao desenvolvimento de modelos regionais sobre a evolução paleotectônica e paleogeográfica desta região, assim como na correlação com sua contraparte naÁfrica. Aquié apresentada uma investigação realizada com base em dados sísmicos e de métodos potenciais regionais. Os resultados mostraram que esta região representa um alto do embasamento que forma uma plataforma estreita com uma cobertura sedimentar pouco espessa (0,8-2,5 km) e uma quebra abrupta da plataforma, o que criou uma grande zona de bypass através do talude. A análise de uma seção sísmica profunda revelou que a crosta continental afinada (crosta transicional) representa uma estreita zona, e que o limite crosta continental-oceânica (COB) está localizado a aproximadamente 100 km a leste da atual linha de costa. A modelagem geofísica, integrada com a interpretação sísmica, indica que esta regiãoé caracterizada por um afinamento abrupto da crosta continental, com a consequente ascensão súbita da Moho. Também há evidências da existênci...

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“…Continental drifting and sediment loading generated regional uplift in the continental margin, defining present-day physiography (Mohriak et al, 2008). Tucano-Sergipe Sections (Blaich et al, 2008), 2: Recôncavo-Jacuípe Sections (Blaich et al, 2008), 3: Camamu Section (Blaich et al, 2011;Heine et al, 2013), 4: Espírito Santo Section (Zalán et al, 2011;Peron-Pinvidic et al, 2013), 5: Campos Section (Aslanian et al, 2009;Zalán et al, 2011), 7: Gabon Section (Blaich et al, 2011), 8,9: North and South Gabon Sections (Dupré et al, 2011), 10: North Angola Section (Aslanian et al, 2009), 11: South Angola Section (Peron-Pinvidic et al, 2013, 12: Kwanza Section (Blaich et al, 2011). (B) Paleoreconstruction (119 Ma) closing the South Atlantic Rift System according to Heine et al (2013) showing the selected pairs of conjugate sections Camamu-Gabon and Espírito Santo-Kwanza.…”

Section: The Central South Atlanticmentioning

confidence: 99%

From orogen to rifted passive margin formation in Brazil: Geodynamic numerical modeling considering the effects of structural inheritance and rheology

Salazar-Mora¹

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Northeastern Brazilian margin: Regional tectonic evolution based on integrated analysis of seismic reflection and potential field data and modelling

Cited by 58 publications

References 73 publications

Crustal breakup and continent-ocean transition at South Atlantic conjugate margins

Crustal breakup and continent-ocean transition at South Atlantic conjugate margins

Characterization of the Ocean-Continent Transition in the Paraíba Basin and Natal Platform Region, Ne Brazil

From orogen to rifted passive margin formation in Brazil: Geodynamic numerical modeling considering the effects of structural inheritance and rheology

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