Abstract
Abstract In the southern portion of the Borborema Province, in the Sergipano Orogenic System, three basement inliers have been described: the Domes of Itabaiana and Simao Dias, in Sergipe; and the Girau do Ponciano Dome, in Alagoas. The Itabaiana and Simao Dias Domes occur in the central part of the Vaza Barris Domain, being composed of gneisses and migmatites. The Itabaiana rocks are calc-alkaline with trondhjemitic affinities. The Girau do Ponciano Dome, outcropping in the Macurure Domain, consists mainly of tonalitic, dioritic, monzonitic, granodioritic and high-grade granitic orthogneisses. SHRIMP U-Pb zircon date of a melanosome sample from a trondhjemitic migmatitic gneiss in the central part of Itabaiana Dome provided an age of 2831 ± 6 Ma, indicating that the migmatitic gneisses of this dome are correlated to the Mesoarchean terranes of the Sao Francisco Craton (Serrinha Block). These rocks represent the oldest geological record in the Sergipe State.
Highlights
The structure of orogenic systems involves complex tectonic assembly of different crustal blocks to result in collages of allochthonous terrane separates from the cratons in which they originated (Friend et al 2008)
The Borborema Province in Sergipe is represented by the Sergipano Orogenic System (SOS), which is formed by a set of ESE-WNW trending belts with distinct geological
The hypothesis of magmatic crystals is corroborated by Th/U ratios greater than 0.1 like as to those described in the literature (Rubatto 2002)
Summary
The structure of orogenic systems involves complex tectonic assembly of different crustal blocks to result in collages of allochthonous terrane separates from the cratons in which they originated (Friend et al 2008). The Borborema Province in Sergipe is represented by the Sergipano Orogenic System (SOS), which is formed by a set of ESE-WNW trending belts with distinct geological histories, placed between the São Francisco Craton in the South and the Pernambuco-Alagoas Superterrane Northwards (Santos et al 1998, Oliveira et al 2017, Brito Neves and Silva Filho 2019). The SOS is one of the most important Neoproterozoic orogens of Northeastern Brazil, being interpreted as the result of a collision between the Pernambuco-Alagoas Superterrane and the São Francisco paleoplate during the Brazilian/Pan-African Orogeny (Oliveira et al 2010, 2017; Fig. 1). Anchimetamorphic rocks make up the Estância and Vaza-Barris domains outcrops in the Southern area of the SOS, while in the Northern and Central regions at the Macururé, Marancó, Poço Redondo and Canindé domains (Fig. 1) the metamorphism reaches the amphibolite facies
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