Crustal Evolution and the Brasiliano Orogeny in Northeast Brazil

Caby, Renaud; Sial, Alcídes N.; Arthaud, Michel Henri; Vauchez, Alain

doi:10.1007/978-3-642-84153-8_16

Cited by 76 publications

(72 citation statements)

References 29 publications

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“…2a): (a) Trapiá (quartz conglomerate), (b) Caiçara (ferruginous siltstones), (c) Frecheirinha (limestones and subordinate marls) and (d) Coreaú (sandstone and greywacke) located in the Médio Coreaú Domain, Borborema Province. This Domain is characterized by graben and horst structures controlled by NE-trending shear zones, and is bounded to the northeast by the Transbrasiliano Lineament, which separates it from the Ceará Central Domain (Caby et al 1991, Santos et al 2008. The age of the carbonate rocks of the Frecheirinha Formation is poorly constrained by C− and Sr-chemostratigraphy and radiometric ages as late Neoproterozoic (Sial et al 2000, Chiglino 2013.…”

Section: Introductionmentioning

confidence: 99%

Acritarchs of the Ediacaran Frecheirinha Formation, Ubajara Group, Northeastern Brazil

Chiglino

Gaucher

Sial

et al. 2015

An. Acad. Bras. Ciênc.

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We report for the first time the occurrence of organic-walled microfossils in Ediacaran limestones and marls of the Frecheirinha Formation, Ubajara Group, and the first Precambrian acritarchs so far reported for northeastern Brazil. The assemblage of the Frecheirinha Formation represents a low-diversity microflora comprising Leiosphaeridia, Lophosphaeridium and subordinated Bavlinella (=Sphaerocongregus). Sr values between 0.7075 and 0.7080 suggest an Ediacaran age. The acritarch assemblage is comparable to the Late Ediacaran Leiosphere Palynoflora (LELP) or Kotlin-Rovno assemblage, in broad agreement with chemostratigraphic data. Macrofossils belonging to the Ediacara fauna were reported from the overlying Jaibaras Group, which would constrain even further the depositional age of the Frecheirinha Formation to within ca. 575-555 Ma. A more comprehensive palynological study of the Frecheirinha Formation is necessary to confirm this age assignment.

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Section: Introductionmentioning

confidence: 99%

Acritarchs of the Ediacaran Frecheirinha Formation, Ubajara Group, Northeastern Brazil

Chiglino

Gaucher

Sial

et al. 2015

An. Acad. Bras. Ciênc.

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“…1). This Province includes a complex system of high-temperature crustal scale shear zones that separate the province into tectonic domains, and they also control the emplacement of granites during the Brasiliano/Pan-African orogeny (Caby et al 1991;Jardim de Sá 1994;Vauchez et al 1995). The province has been studied for decades, and different authors developed evolution models and configuration of their different domains (Almeida et al 1981;Brito Neves 1983;Brito Neves et al 1982Jardim de Sá 1994;Sial 1986;Neves 2003;Santos et al 2010;Van Schmus et al 1995Ganade de Araújo et al 2014.…”

Section: Analytical Proceduresmentioning

confidence: 99%

“…Most of the Neoproterozoic granite genesis is coeval with the development of large shear zones, which exerted strong tectonic control on the emplacement of the granitoids (Caby et al 1991;Vauchez et al 1995). The older Neoproterozoic plutons (640 -610 Ma) are more strongly deformed, suggesting the pre-to syn-tectonic nature of intrusions.…”

Section: Brasiliano Magmatismmentioning

confidence: 99%

Geological and isotopic characteristics of granites from the Western Pernambuco-Alagoas Domain: implications for the crustal evolution of the Neoproterozoic Borborema Province

et al. 2014

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“…The Bossangoa-Bossembele area (NW Central African Republic-CAR) forms part of the North Equatorial Fold Belt (NEFB) that extends from Nigeria to the CAR through Cameroon and can be correlated with the Borborema Province of NE Brazil [1]. The NEFB is affected by the Central Cameroon Shear Zone (CCSZ; [2]), which is a major lineament of the Pan-African Orogen of Central Africa.…”

Section: Introductionmentioning

confidence: 99%

Major Structural Features and the Tectonic Evolution of the Bossangoa-Bossembele Basement, Northwestern Central African Republic

Hubert¹

2011

TOGEOJ

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Planar structures (foliations and shear zones) and linear structures (lineations, fold axes) around the Bossangoa and Bossembele area (northwestern part of the Central African Republic) in the North Equatorial fold belt have been investigated and analyzed with the aim of unraveling the major structural elements and the tectonic evolution of the basement. The foliations show two major trends, an older flat-lying granulitic layering of uncertain age reworked by later, Neoproterozoic NE-SW ductile, sinistral shearing and mylonitization. The related lineation is conspicuous and corresponds to a mineral and stretching lineation. It trends N0-30°E with a moderate plunge (0-15) towards the north. F 1 folds occur only as decimeter-sized isoclinals folds; their axial traces are roughly parallel to the lineation. The brittle phase characterized by NW-SE-trending open and partially filled fractures is younger than the mylonitization. Quartzofelsdpathic anatectic veins or planes are commonly boudinaged, and the shape of boudins rather suggests non-coaxial deformation. The mylonitic foliation with associated stretching lineation and the ductile shear zone are recognized for the first time and support a tectonic evolution in which ductile deformation was overprinted by brittle failure accompanied by the emplacement of some intrusives.

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Crustal Evolution and the Brasiliano Orogeny in Northeast Brazil

Cited by 76 publications

References 29 publications

Acritarchs of the Ediacaran Frecheirinha Formation, Ubajara Group, Northeastern Brazil

Acritarchs of the Ediacaran Frecheirinha Formation, Ubajara Group, Northeastern Brazil

Geological and isotopic characteristics of granites from the Western Pernambuco-Alagoas Domain: implications for the crustal evolution of the Neoproterozoic Borborema Province

Major Structural Features and the Tectonic Evolution of the Bossangoa-Bossembele Basement, Northwestern Central African Republic

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