The western São Francisco pericraton interpreted from crustal magnetic and gravity sources

Reis, Luciane Katiuscia Oliveira dos; Vidotti, Rose Meire; Cordeiro, Pedro; Oliveira, Claudinei Gouveia de

doi:10.1016/j.jsames.2020.102716

Cited by 4 publications

(1 citation statement)

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“…The results of the modeling associate the Estância Group with a tabular block with no correlation with negative gravimetric anomaly, with a density of around 2,800 kg/m 3 and a thickness of less than 3 km (EST in Figures 5 and 6). These data indicate that the development of the basin did not produce great sedimentary thickness and sufficient weight to flexure the São Francisco plate, as occurred with the sedimentation of foreland of the Araguaia belts (Ussami and Molina, 1999) and Brasília (Reis et al, 2020). The most likely explanation may be attributed to the elastic properties of the São Francisco Craton lithosphere involved in the collision with the Sergipano Belt.…”

Section: Discussion and Tectonic Implicationsmentioning

confidence: 88%

Deep crustal structure of the Sergipano Belt, NE-Brazil, revealed by integrated modeling of gravity, magnetic, and geological data

Oliveira¹,

Domingos²,

Medeiros³

2023

JGSB

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The Sergipano Belt is located in the Southern Subprovince of Borborema Province in the Northeast of Brazil. Its tectonic framework was consolidated in the Pan-African-Brasiliano Orogeny at the end of the Neoproterozoic. The most recent geological models indicate that its evolution occurred over a complete Wilson cycle. Gravimetric and magnetic data profiles that crossed the Sergipano Belt from south to north were modeled jointly by the direct method to provide a 2D view of the crust framework. The modeling process was linked and supported by the use of geological data and models. The result revealed the deep structure of the crust and identified the geometry of the main geological domains to the depth of Moho's discontinuity. The folds and thrusts toward the São Francisco Craton are a persistent and deep feature in the Southern crust of the Sergipano Belt. The general tectonic context of the models is compatible with the subduction and collision of the São Francisco Paleo-Plate under the Pernambuco-Alagoas Superterrane, sutured in the Shear Zone of São Miguel do Aleixo. The presence of dense blocks at the base of the crust was interpreted as layers of ophiolites placed by obduction. The metasediments of the Vaza Barris and Macururé Domains are tabular bodies with thicknesses lower than 5 km, which dip horizontally or at a low angle on the flanks of the shear zones. Small vertical bodies of lower density within the Macururé Domain have correlation with granitic intrusions. In the Canindé Domain there is a dense layer in the lower crust that was interpreted as the relicts of the oceanic crust that based a backarc basin. The granitic bodies modeled north of the Canindé Domain and correlated with the Serra do Catu batholith in Pernambuco-Alagoas Superterrane, may be the record of subduction of this crust to the north. The data and models revealed geophysical differences between the Jirau do Ponciano, Coruripe River Domains and the crust north of the Palmeira dos Índios Shear Zone. These terrains are separated by shear zones with evident expression in gravimetric and magnetic data. However, the existence of Neoproterozoic metasedimentary supracrustal rocks partially covering the domains and zones and borderline shear indicates that the junction among these blocks occurred before the deposition of Neoproterozoic sediments.Deep crustal structure of the Sergipano Belt, NE-Brazil, revealed by integrated modeling of gravimetric, magnetic, and geological data Accepted manuscript -Uncorrected pre-proof This is a PDF file containing an unedited and non-definitive version of a manuscript that has been accepted for publication by the Journal of the Geological Survey of Brazil -JGSB, which serves to provide early visibility of the article. Being an uncorrected preproof version, errors may appear during the production process (language review, formatting and proof review), and these can affect the final content of the article and all legal disclaimers (https://jgsb.cprm.gov.br/index.php/journal/6).

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Section: Discussion and Tectonic Implicationsmentioning

confidence: 88%