Neoproterozoic (740-680 Ma) arc-back-arc magmatism in the Sergipano Belt, southern Borborema Province, Brazil

Passos, Luiz Henrique; Fuck, R. A.; Chemale, Farid; Lenz, Cristine; Pimentel, Márcio Martins; Machado, Alice Beatriz Mombach Pinheiro; Pinto, Viviane Machado

doi:10.1016/j.jsames.2021.103280

Cited by 15 publications

(20 citation statements)

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“…The dating of these rocks indicated a sedimentation and magmatism activity that may have started in the Cryogenian (Oliveira et al, 2010). Additionally, the tectonic extension processes that occurred in the Canindé Domain may have evolved to the stages of oceanic crust formation, followed by subduction and formation of magmatic arcs (Passos et al, 2021).…”

Section: Geological Synthesis Of the Sergipano Beltmentioning

confidence: 95%

“…The Marancó Domain -Poço Redondo is separated into two subdomains: the Marancó where a sequence of felsic, mafic and ultramafic metavolcanic rocks with intercalations of metasediments (Tonian to Ediacaran) (Silva Filho, 2006;Oliveira et al, 2010); and the Poço Redondo composed of gneisses and tonalitic-granodioritic migmatites, whose calcium alkaline composition and the orthogneisses dating suggest generation in a continental magmatic arc in Tonian (Van Schmus et al, 1995;Carvalho, 2005, Oliveira et al, 2010. To the north of the Marancó -Poço Redondo Domain meta volcano-sedimentary sequences occur and an intrusive mafic-ultramafic suite that make up the Canindé Domain, interpreted as an intracontinental rift (Oliveira et al, 2010) or a back-arc basin (Lima et al, 2018;Passos et al, 2021). The dating of these rocks indicated a sedimentation and magmatism activity that may have started in the Cryogenian (Oliveira et al, 2010).…”

Section: Geological Synthesis Of the Sergipano Beltmentioning

confidence: 99%

“…The removal of the long wavelength of the original gravimetric data highlighted intracrustal sources, in a way to provide a better correlation in map with known geological data and models (e.g., D'el-Rey Silva, 1995a;D'el-Rey Silva, 1999;Davison e Santos, 1998;Oliveira et al, 2010;Passos et al, 2021). Most of the gravimetric data presented in this work are public domain and can be obtained from the National Gravimetric Database (BNDG) of the National Agency of Petroleum (ANP).…”

Section: Geophysical Datamentioning

confidence: 99%

“…In the joint modeling, the following procedures were adopted: i) addition of density blocks and magnetic susceptibility with the same geometric contours and according to surface geological information; ii) calculation of effects; (iii) comparison of the calculated effects with the observed data until the profile adjustment is obtained for a coherent model compatible with known geological information. The geological models used as reference and modeling link are published in D'el-Rey Silva (1995a), D'el-Rey Silva (1999, Oliveira et al (2010), Lima et al (2018) and Passos et al (2021).…”

Section: Guidelines Of Joint Direct Modeling 25 D Of Gravimetric and ...mentioning

confidence: 99%

“…In this context, an important component was the U-Pb dating of granitic magmatism that recorded the pre, sin and post collisional stages of the orogenic cycle (Bueno et al, 2009;Oliveira et al, 2015a); as well as, the U-Pb geochronology of detrital zircons and Nd isotopes of sediments that allowed the identification of erosion sources of the rocks that filled the Neoproterozoic basins (D'el-Rey Silva, 1999;Oliveira et al, 2010;Oliveira et al, 2015b). This model was also favored by the existence of a regional geological context that connects the Sergipano Belt with the Yaoundé Belt in Africa and establishes its importance in the formation of the West Gondwana Continent (Oliveira et al, 2006;Van Schmus et al, 2008) More recently, Passos et al (2021) identified the formation of back-arc basins in the Canindé Domain, providing further evidence for the evolution model of the Sergipano Belt by opening and closing of oceans.…”

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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Section: Geological Synthesis Of the Sergipano Beltmentioning

confidence: 95%