Deep structure of the Santos Basin‐São Paulo Plateau System, SE Brazil

Evain, Mikaël; Afilhado, Alexandra; Rigoti, Caesar Augusto; Loureiro, Afonso; Alves, Daniel Pavani Vicente; Klingelhoëfer, Frauke; Schnürle, Philippe; Feld, Aurélie; Fuck, Reinhardt A.; Soares, Joelson Lima; Lima, Miguel; Corela, Carlos; Matias, L.; Benabdellouahed, Massinissa; Baltzer, Agnès; Rabineau, Marina; Viana, Adriano R.; Moulin, Maryline; Aslanian, Daniel

doi:10.1002/2014jb011561

Cited by 77 publications

(53 citation statements)

References 68 publications

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“…Interpretação tectônica simplificada da estrutura crustal e topo do manto superior ao longo da extensão combinada onshore-offshore (1620 km) entre os perfis sísmicos PABBRISE (este trabalho) e SB01 (Evain et al, 2015). A região do necking marca afinamento crustal abrupto.…”

Section: Figura 69unclassified

“…De maneira geral, o valor de incerteza atribuído está dentro do intervalo definido em trabalhos em que inspeções e testes quantitativos foram realizados (Rumpfhuber, 2008;Starostenko et al, 2013;Evain et al, 2015).…”

Section: Identificação E Leitura Dos Alinhamentos De Fases Sísmicasunclassified

“…A estrutura crustal obtida no modelo sísmico PABBRISE foi combinada com a do modelo SanBa -SB01 (Evain et al, 2015) (Woldemichael, 2003), e também a leste. Tal cenário acabou por enriquecer e individualizar um domínio de manto litosférico peculiar para esta região (Minei, 2015;Padilha et al, 2015), o Manto Litosférico Paraná Norte deste trabalho.…”

Section: Considerações Sobre a Evolução Da Bacia Do Paraná E Da Margeunclassified

“…Figura 6.9 Interpretação tectônica simplificada da estrutura crustal e topo do manto superior ao longo da extensão combinada onshore-offshore (1620 km) entre os perfis sísmicos PABBRISE (este trabalho) e SB01 (Evain et al, 2015). (Julià et al, 2008;Peixoto, 2015) sugerem diferentes compartimentos composicionais, mas como representam médias crustais e como a crosta inferior foi retrabalhada, não são ideais para a definição de um arcabouço para o embasamento.…”

Section: Considerações Sobre a Evolução Da Bacia Do Paraná E Da Margeunclassified

“…Nos últimos anos, no Brasil, vêm sendo envidados esforços no sentido de utilizar métodos sísmicos (Bassini, 1986 e referências ali contidas; Soares, 2005;Soares et al, 2006;Tavares, 2014;Evain et al, 2015;Lima et al, 2015) e sismológicos (Assumpção et al, 2002;França & Assumpção, 2004;Julià et al, 2008;Rocha et al, 2011;Trindade, 2014;Azevedo et al, 2015) para mapear a estrutura profunda da crosta e manto superior e, com isso, aprimorar o entendimento da compartimentação tectônica e evolução crustal do território brasileiro.…”

Section: Capítulo 1 -Introduçãounclassified

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Modelo de velocidade sísmica de ondas P da crosta e manto superior ao longo do perfil PABBRISE, estado de São Paulo

Bernardes¹

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Section: Figura 69unclassified

Section: Identificação E Leitura Dos Alinhamentos De Fases Sísmicasunclassified

Section: Considerações Sobre a Evolução Da Bacia Do Paraná E Da Margeunclassified

Section: Capítulo 1 -Introduçãounclassified

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Modelo de velocidade sísmica de ondas P da crosta e manto superior ao longo do perfil PABBRISE, estado de São Paulo

Bernardes¹

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Density and P‐wave velocity structure beneath the Paraná Magmatic Province: Refertilization of an ancient lithospheric mantle

Chaves

Ussami

Ritsema

2016

Geochem Geophys Geosyst

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We estimate density and P‐wave velocity perturbations in the mantle beneath the southeastern South America plate from geoid anomalies and P‐wave traveltime residuals to constrain the structure of the lithosphere underneath the Paraná Magmatic Province (PMP) and conterminous geological provinces. Our analysis shows a consistent correlation between density and velocity anomalies. The P‐wave speed and density are 1% and 15 kg/m3 lower, respectively, in the upper mantle under the Late Cretaceous to Cenozoic alkaline provinces, except beneath the Goiás Alkaline Province (GAP), where density (+20 kg/m3) and velocity (+0.5%) are relatively high. Underneath the PMP, the density is higher by about 50 kg/m3 in the north and 25 kg/m3 in the south, to a depth of 250 − 300 km. These values correlate with high‐velocity perturbations of +0.5% and +0.3%, respectively. Profiles of density perturbation versus depth in the upper mantle are different for the PMP and the adjacent Archean São Francisco (SFC) and Amazonian (AC) cratons. The Paleoproterozoic PMP basement has a high‐density root. The density is relatively low in the SFC and AC lithospheres. A reduction of density is a typical characteristic of chemically depleted Archean cratons. A more fertile Proterozoic and Phanerozoic subcontinental lithospheric mantle has a higher density, as deduced from density estimates of mantle xenoliths of different ages and composition. In conjunction with Re‐Os isotopic studies of the PMP basalts, chemical and isotopic analyses of peridodite xenoliths from the GAP in the northern PMP, and electromagnetic induction experiments of the PMP lithosphere, our density and P‐wave speed models suggest that the densification of the PMP lithosphere and flood basalt generation are related to mantle refertilization. Metasomatic refertilization resulted from the introduction of asthenospheric components from the mantle wedge above Proterozoic subduction zones, which surrounded the Paraná lithosphere. The high‐density PMP lithosphere is presently gravitationally unstable and prone to delamination.

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Lower Crustal Strength Controls on Melting and Serpentinization at Magma‐Poor Margins: Potential Implications for the South Atlantic

Ros

Pérez‐Gussinyé

Araújo

et al. 2017

Geochem Geophys Geosyst

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Rifted continental margins may present a predominantly magmatic continent‐ocean transition (COT), or one characterized by large exposures of serpentinized mantle. In this study we use numerical modeling to show the importance of the lower crustal strength in controlling the amount and onset of melting and serpentinization during rifting. We propose that the relative timing between both events controls the nature of the COT. Numerical experiments for half‐extension velocities <=10 mm/yr suggest there is a genetic link between margin tectonic style and COT nature that strongly depends on the lower crustal strength. Our results imply that very slow extension velocities (< 5 mm/yr) and a strong lower crust lead to margins characterized by large oceanward dipping faults, strong syn‐rift subsidence and abrupt crustal tapering beneath the continental shelf. These margins can be either narrow symmetric or asymmetric and present a COT with exhumed serpentinized mantle underlain by some magmatic products. In contrast, a weak lower crust promotes margins with a gentle crustal tapering, small faults dipping both ocean‐ and landward and small syn‐rift subsidence. Their COT is predominantly magmatic at any ultra‐slow extension velocity and perhaps underlain by some serpentinized mantle. These margins can also be either symmetric or asymmetric. Our models predict that magmatic underplating mostly underlies the wide margin at weak asymmetric conjugates, whereas the wide margin is mainly underlain by serpentinized mantle at strong asymmetric margins. Based on this conceptual template, we propose different natures for the COTs in the South Atlantic.

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Deep structure of the Santos Basin‐São Paulo Plateau System, SE Brazil

Cited by 77 publications

References 68 publications

Modelo de velocidade sísmica de ondas P da crosta e manto superior ao longo do perfil PABBRISE, estado de São Paulo

Modelo de velocidade sísmica de ondas P da crosta e manto superior ao longo do perfil PABBRISE, estado de São Paulo

Density and P‐wave velocity structure beneath the Paraná Magmatic Province: Refertilization of an ancient lithospheric mantle

Lower Crustal Strength Controls on Melting and Serpentinization at Magma‐Poor Margins: Potential Implications for the South Atlantic

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