Accretion tectonics in Western Gondwana highlighted by the aeromagnetic signature of the Sergipano Belt, NE Brazil

Almeida, Gabriela M.; Fuck, Reinhardt A.; Lima, Darby Pereira Dantas de; Dantas, Elton Luiz

doi:10.1016/j.tecto.2021.228742

Cited by 12 publications

(8 citation statements)

References 55 publications

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“…Although there are important disagreements, the proposed evolution models for the Sergipano Belt converge in several aspects. In summary, the Sergipano Belt was formed by the collision between the São Francisco Craton and the Pernambuco-Alagoas Superterrane in the Ediacaran, having occurred additional processes on the margin of the São Francisco Plate and its subduction under the Pernambuco-Alagoas Superterrane (Figure 9) (e.g., Oliveira et al, 2010;Passos et al, 2021, Almeida et al, 2021. As an example, Oliveira et al (2010) advocate an evolution that covers a complete Wilson cycle.…”

Section: Discussion and Tectonic Implicationsmentioning

confidence: 99%

“…These parameters suggest for this region the existence of a crust block with singular geophysical expression, distinct from the adjacent crust. Almeida et al (2021) called this anomaly High-Intensity Magnetic Zone (HIMZ), interpreted its continuity in the Canindé Domain and concluded that the HIMZ was the main suture between the PEAL Block and the São Francisco Craton.…”

Section: Correlations Of Geophysical Data With Geological Domains Of ...mentioning

confidence: 99%

“…The use of geophysical data integrated with geological information is a fundamental tool for the in-depth reconstruction of the crustal framework of geotectonic domains. In particular, gravimetric and magnetic data have been used to understand the configurations of terrains with different types of tectonic evolutions, especially folded bands of different ages (e.g., Gibb et al, 1983;Karner and Watts, 1983;Ussami and Molina, 1999;Holm et al, 2007;Mishra and Ravi Kumar, 2014;Rajaram and Anand, 2014;Oliveira and Medeiros, 2018;Almeida et al, 2021;Drenth et al, 2021, Santos et al, 2021. However, geophysical data have been little used to understand the deep framework of the Sergipano Belt.…”

Section: Introductionmentioning

confidence: 99%

“…Likewise, 2D modeling of gravimetric and magnetic data performed by Dutra et al (2019) were able to separate the signal associated with the upper crust from the Vaza Barris, Macururé, Jirau do Ponciano and Coruripe River Domains, but did not demonstrate how these domains are tectonically articulated in depth. More recently, Almeida et al (2021) processed and interpreted magnetic data and concluded by separating the Sergipano Belt by the Shear Zone Belo Monte -Jeremoabo in two domains: external to the south and internal to the north. A range of magneto metric anomalies with a width of 10 km, length of 100 km and with a strong magnetization gradient, coinciding with the Coruripe River and Canindé Domains, was named by Almeida et al (2021) High-Intensity Magnetic Zone (HIMZ) and considered the suture between the São Francisco Caton and the Pernambuco-Alagoas Superterrane.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, Almeida et al (2021) processed and interpreted magnetic data and concluded by separating the Sergipano Belt by the Shear Zone Belo Monte -Jeremoabo in two domains: external to the south and internal to the north. A range of magneto metric anomalies with a width of 10 km, length of 100 km and with a strong magnetization gradient, coinciding with the Coruripe River and Canindé Domains, was named by Almeida et al (2021) High-Intensity Magnetic Zone (HIMZ) and considered the suture between the São Francisco Caton and the Pernambuco-Alagoas Superterrane. In turn, with the use of a magneto telluric profile of direction NE-SW, which crossed the Tucano Basin in an oblique angle, Corrêa-Gomes et al (2022) interpreted the geoelectric section image as being the interaction between two crustal blocks, the most resistive to NE representing the crust of the Pernambuco-Alagoas Block and the least resistive to SW representing the São Francisco Craton.…”

Section: Introductionmentioning

confidence: 99%

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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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