Gravity map of part of Northeast Brazil and adjacent continental margin and its interpretation based on the hypothesis of isostasy

Three-Dimensional Shear Wave Velocity Structure of the Northeastern Brazilian Lithosphere

“…Several isolated crustal thicknesses estimates available in the literature, obtained with different geophysical methods and data types, were superimposed to the 3-D Moho image (Figure 7). Those estimates come basically from seismic ( [40]- [43]) and gravimetric methods ( [44]). In general, we observe a good agreement between our 3-D Moho image and those estimates.…”

“…In conclusion, CRUST2.0 global model does not show any relevant variation in Moho depth from one geological province to another and this result does not reflect the complex geological reality of the region ( [46]). Three-dimensional Moho image of the northeastern Brazil based on the methodology proposed in this study, and some isolated crustal thicknesses obtained via seismic (square-28 km [41]; triangle-40 km [40]; red numbers [42]; black numbers [43]) and gravimetric methods (white isolines [44]). Numbers close to the isolines are the corresponding crustal thicknesses.…”

“…Dashed lines are the structural province limits defined by [46] and the abbreviations are the following: TO-Tocantins Province, SF-São Francisco Province, PC-Coastal Province, PB-Borborema Province and PA-Parnaíba Province. [40]) and gravimetric methods (white isolines [44]). Numbers close to the isolines are the corresponding crustal thicknesses.…”

Contribuição Geofísica À Análise Do Arcabouço Tectônico Do Domínio Rio Grande Do Norte, Província Borborema – Ne Brasil

“…Em diferentes terrenos, dados magnéticos e gravimétricos têm sido usados para o estudo da geometria, arranjo espacial e caracterização de limites físicos de blocos litosféricos, bem como permitem avaliar as condições relacionadas tanto a origem, profundidade de geração de magmas e o posicionamento de corpos intrusivos associados ao desenvolvimento de extensas zonas de cisalhamento dúcties (Castro et al 1998, Blum 1999, Mantovani et al 1999, Wellmann 2000, Ramadass et al 2005, Soares 2006). …”

“…Figura 2.1 -Localização da Província Borborema e da área de estudo no contexto geotectônico da Plataforma Sul-Americana (modificado de Almeida et al 1977, Brito Neves et al 2000, CPRM 2001 Gravimétrico do Nordeste Setentrional do Brasil e da espessura da crosta continental (28km) obtida por Matos (1992a), com base em interpretações de seções sísmicas de reflexão profunda (Castro et al 1997b) (Castro et al 1998, Blum 1999, Campelo 1999, Rutland et al 2001, Oliveira et al 2005b, Holm et al 2007). …”