Deep seismic refraction and gravity crustal model and tectonic deformation in Tocantins Province, Central Brazil

Berrocal, Jesús; Marangoni, Yára Regina; Sá, Nelsi Côgo de; Fuck, Reinhardt A.; Soares, Joelson Lima; Dantas, Elton Luiz; Perosi, Fábio André; Fernandes, Cláudia Barbosa

doi:10.1016/j.tecto.2004.04.033

Cited by 61 publications

(30 citation statements)

References 10 publications

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“…those features shown in Fig. 2, and the Goiás-Tocantins seismic belt studied by Berrocal et al, 1984Berrocal et al, , 2004Fernandes et al, 1991). On the other hand, the EeW splitting direction discussed here correlates well with the aeromagnetometry map (Fig.…”

Section: S-wave Anisotropy Beneath Central Brazil E Discussionsupporting

confidence: 56%

Crust and upper mantle structure in central Brazil derived by receiver functions and SKS splitting analysis

Rosa¹,

Rosa²,

Fuck³

2012

Journal of South American Earth Sciences

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Section: S-wave Anisotropy Beneath Central Brazil E Discussionsupporting

confidence: 56%

Crust and upper mantle structure in central Brazil derived by receiver functions and SKS splitting analysis

Rosa¹,

Rosa²,

Fuck³

2012

Journal of South American Earth Sciences

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“…This uncertainty estimate is larger than the crustal thickness variations among the velocity models developed from the same dataset (e.g. Berrocal et al (2004) and Soares et al (2006), for the Tocantins Province, or Soares et al (2010) and Lima (2011), for the Borborema Province). Old, unreversed seismic experiments interpreted with 1D models also contributed to our compilation.…”

Section: Active Sourcesmentioning

confidence: 77%

Crustal thickness map of Brazil: Data compilation and main features

Assumpção

Bianchi

Julià

et al. 2013

Journal of South American Earth Sciences

112

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“…The first detailed study of seismic structure in the SFC was obtained by a 530 km long, E-W deep seismic refraction line, shot in 1998 across the Tocantins Province and the western part of the craton, at 13°-14°S (Berrocal et al 2004;Soares et al 2006). The model obtained by Soares et al (2006) has four crustal layers in the western part of the SFC with Moho depth at about 42 km.…”

Section: Crustal Thicknessmentioning

confidence: 99%

“…All these "collision zones" were modeled as dipping to the west. Another interesting finding was that the upper mantle velocity (Pn) was high (8.2-8.3 km/s) beneath the SFC as well as beneath the external zone, compared to the 8.0-8.1 km/s beneath the Goiás Massif and Magmatic Arc (Berrocal et al 2004;Soares et al 2006). All these characteristics led Soares et al to place the western limit of the craton's deep crust, i.e., the edge of the São Francisco plate, near the boundary between the Goiás massif and the Brasilia belt (near coordinate 230 km in the profile of Fig.…”

Section: Crustal Thicknessmentioning

confidence: 99%

Lithospheric Features of the São Francisco Craton

Assumpção

Azevedo

Rocha

et al. 2016

São Francisco Craton, Eastern Brazil

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Studying the thick lithosphere of cratons is important to help understand their formation and the mechanisms for their preservation. We present a synthesis of the information available for the deep structure in Eastern Brazil, from seismological and gravity data, to characterize the São Francisco Craton (SFC) and help better define its lateral boundaries at depth. Crustal thicknesses of the SFC, known mainly from receiver function studies, range from 38 to 42 km, except for a localized thickening (up to 44 km) in the northern part, and crustal thinning towards the Atlantic continental margin in Bahia state. Overall, the crust is slightly thicker near the geologically-defined surface boundaries (40-42 km) and slightly thinner in the center (38-40 km), which is consistent with generally low Bouguer anomalies and high topography to the East and to the West of the craton probably defining the suture zones during the Gondwana amalgamation. Modeling of gravity anomalies with some seismic constraints indicates a relatively low-density lithospheric mantle for the SFC, despite higher Pn velocity, which is consistent with a Fe-depleted, buoyant lithosphere, which helps preserve the cratons's root. Surface-wave continental-scale tomography suggested the thickest lithosphere, around 200 km, to be in the Archean southern part of the SFC, consistent with regional P-and S-wave tomography. Both the surface-wave and the body-wave tomographies show high upper mantle velocities beneath the Brasilia fold belt, next to the SFC's surface limits, which is interpreted as a continuation at depth of the craton's lithosphere, beneath the low-grade external metamorphic domain of the Brasilia fold belt. Analysis of the SFC seismicity shows that most earthquakes now occur on shallow (<2 km) normal faults formed during the formation of the Brasiliano continental margin, now reactivated under the present E-W compressional stresses.

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Deep seismic refraction and gravity crustal model and tectonic deformation in Tocantins Province, Central Brazil

Cited by 61 publications

References 10 publications

Crust and upper mantle structure in central Brazil derived by receiver functions and SKS splitting analysis

Crust and upper mantle structure in central Brazil derived by receiver functions and SKS splitting analysis

Crustal thickness map of Brazil: Data compilation and main features

Lithospheric Features of the São Francisco Craton

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