The Caraguataí syenitic suite, a ca. 2.7Ga-old alkaline magmatism (petrology, geochemistry and U–Pb zircon ages). Southern Gavião block (São Francisco Craton), Brazil

Cruz, Simone Cerqueira Pereira; Peucat, Jean-Jacques; Teixeira, Léo Rodrigues; Carneiro, Maurício Antônio; Martins, Adriano Alberto Marques; Santana, Jocilene dos Santos; Souza, Jailma Santos de; Barbosa, Johildo Salomão Figueirêdo; Leal, A. B. Menezes; Dantas, Elton Luiz; Pimentel, Márcio Martins

doi:10.1016/j.jsames.2011.11.006

Cited by 33 publications

(11 citation statements)

References 53 publications

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“…A Neoarchean magmatic event is confirmed by the occurrence of the alkaline granitic gneisses of Serra do Eixo that emplaced 2693 AE 5 Ma ago. This age is similar to that recently obtained for the syenites and syeno-granites of the Caraguataí Massif (Table 1; Cruz et al, 2012), 60 km to the north of the UBA region, in the Chapada Diamantina (Fig. 2).…”

Section: The Existence Of a Neoarchean Magmatism In The Uba Regionsupporting

confidence: 90%

“…Methodologies: (1) SHRIMP, (2) TIMS evaporation, (3) TIMS (ID), (4) LA ICPMS, (5) EPMA. References: (1) Peucat et al (2002), (2) Nutman and Cordani (1993), (3e4) Martin et al (1991Martin et al ( , 1997, (5) Marinho et al (2008), (6) Marinho et al (1994), ( 7) Nutman et al (1994), ( 8) Santos Pinto et al (1998), ( 9) Bastos Leal et al (2003), (10) Bastos Leal et al (2000), ( 11) Cruz et al (2012), (12) Bastos Leal et al (1998). and 2.1 Ga Sabaté, 2002, 2004;Delgado et al, 2003;Peucat et al, 2011).…”

Section: Geological Settingmentioning

confidence: 99%

“…The UePb available ages, SmeNd data and related references are reported in Table 1. Pioneer work (RbeSr and KeAr ages) is reported in Table 1 of Cruz et al (2012).…”

Section: Geological Settingmentioning

confidence: 99%

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Crustal evolution between 2.0 and 3.5 Ga in the southern Gavião block (Umburanas-Brumado-Aracatu region), São Francisco Craton, Brazil: A 3.5–3.8 Ga proto-crust in the Gavião block?

Santos-Pinto

Peucat

Martin

et al. 2012

Journal of South American Earth Sciences

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Section: The Existence Of a Neoarchean Magmatism In The Uba Regionsupporting

confidence: 90%

Section: Geological Settingmentioning

confidence: 99%

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Crustal evolution between 2.0 and 3.5 Ga in the southern Gavião block (Umburanas-Brumado-Aracatu region), São Francisco Craton, Brazil: A 3.5–3.8 Ga proto-crust in the Gavião block?

Santos-Pinto

Peucat

Martin

et al. 2012

Journal of South American Earth Sciences

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“…According to previous mapping projects and stratigraphic correlations (e.g., Inda & Barbosa 1978, Uhlein 1991, Barbosa & Dominguez 1996, Pedrosa-Soares et al 2001, Wosniak et al 2013, Knauer et al 2015 and our own work in the region, the units involved in the Rio Pardo salient are the following (Figs. 1 and 2): ■ A basement assemblage made up of units older than 1.8 Ga and represented by the Porteirinha (Noce et al 2007a, 2007b and Tingui (Knauer et al 2015) complexes, as well as the Gavião, Itabuna-Salvador-Curaçá and Jequié blocks (Marinho et al 1994, Santos Pinto et al 1998, Barbosa et al 2003, Noce et al 2007a, 2007b, Barbosa et al 2012, Cruz et al 2012a, 2012b); ■ The Serra do Inhaúma Group (Lima et al 1981, Uhlein 1991, comprised of a succession of metarhythmite, schist and quartzite. These authors correlate these rocks to the Espinhaço Supergroup deposited between 1.78 and 1.00 Ga (Dussin & Dussin 1995, Martins-Neto 2000, Chemale Jr. et al 2012, Santos et al 2015.…”

Section: Geological Settingmentioning

confidence: 99%

The Rio Pardo salient, northern Araçuaí orogen: an example of a complex basin-controlled fold-thrust belt curve

2018

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The Rio Pardo salient, the large antitaxial curve described by the Araçuaí fold-and-thrust belt along the southeastern edge of the São Francisco craton, is one of the most prominent and one of the least studied features of the Brasiliano Araçuaí-West Congo orogenic system (AWCO). In addition to the Archean/Paleoproterozoic basement, the salient is comprised of metasedimentary rocks mainly from the Neoproterozoic Macaúbas Group and the Salinas Formation. Its western limb occupies a portion of the Espinhaço ridge, where the NS-trending structures of the Araçuaí belt progressively curve NE and E, thereby defining the hinge zone along the Serra Geral on the Minas-Bahia boundary. The eastern limb is NW-trending and marked by a major shear zone. In models postulated to generate the AWCO through the closure of the Neoproterozoic Macaúbas basin, this large curve plays a critical kinematic role. Yet, in spite of this, its development is still not fully understood. How did this curve originate? Which factors controlled its generation? Our field study performed in the northern Araçuaí orogen characterized the kinematic picture of the salient, and led to a model that addresses these questions. The results we obtained indicate that the Rio Pardo salient developed in response to four deformation phases. The contractional D1 and D2 phases are coaxial and responsible for a craton-directed tectonic transport along the salient's outer arc, which is coupled with an overall southward motion of the inner arc, thereby giving rise to a rather complex kinematic picture. Furthermore, structures of the D1/D2 phases define a zigzag pattern with alternating NE-and NW-trending segments along the salient's leading edge. Along the NE-trending segments, the metasedimentary rocks are thrust northwestwards on top of the craton basement, while along the NW-trending segments, the supracrustal rocks are displaced along dextral to reverse-dextral transpressional shear zones located on the basement/cover contact. Structures of the D3 phase, which are well developed in the hinge zone, record a final WSW-ENE contraction, which was responsible for rotation of the preexistent fabric elements around NNW-trending axes and the enhancement of the salient curvature. The D4 phase is extensional and is recorded by two large-scale structures, the Chapada Acauã and Tingui normal shear zones, as well as by the normal-sinistral reactivation of the Itapebi strike-slip shear zone that marks the salient eastern limb. We interpret the initiation of the Rio Pardo salient during the collisional 565-575 Ma D1/D2 phases essentially as a primary arc that is mainly controlled by the geometry of the Macaúbas precursor basin. The thickened internal portion of the Rio Pardo salient was affected by extensional tectonism at c. 530 Ma, and is recorded by the D4 deformation phase, which is currently ascribed to the extensional collapse of the Araçuaí-West Congo orogen.

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“…Neoarchean potassic granitoids with ages between 2.75 Ga and 2.6 Ga produced by crustal reworking are common in the Gavião block, which is located to the north of the BIMA, as well as in the southern São Francisco craton ( Fig. 1C; Cruz et al 2012, Santos-Pinto et al 2012, Farina et al 2015, Moreno et al 2017. Consequently, ca.…”

Section: Considerations On the Crustal Evolution Of The Itacambira-momentioning

confidence: 99%

Petrography, geochemistry and geochronology of the potassic granitoids of the Rio Itacambiruçu Supersuite: implications for the Meso- to Neoarchean evolution of the Itacambira-Monte Azul block

Bersan

Filho

Abreu³

et al. 2018

Braz. J. Geol.

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The Caraguataí syenitic suite, a ca. 2.7Ga-old alkaline magmatism (petrology, geochemistry and U–Pb zircon ages). Southern Gavião block (São Francisco Craton), Brazil

Cited by 33 publications

References 53 publications

Crustal evolution between 2.0 and 3.5 Ga in the southern Gavião block (Umburanas-Brumado-Aracatu region), São Francisco Craton, Brazil: A 3.5–3.8 Ga proto-crust in the Gavião block?

Crustal evolution between 2.0 and 3.5 Ga in the southern Gavião block (Umburanas-Brumado-Aracatu region), São Francisco Craton, Brazil: A 3.5–3.8 Ga proto-crust in the Gavião block?

The Rio Pardo salient, northern Araçuaí orogen: an example of a complex basin-controlled fold-thrust belt curve

Petrography, geochemistry and geochronology of the potassic granitoids of the Rio Itacambiruçu Supersuite: implications for the Meso- to Neoarchean evolution of the Itacambira-Monte Azul block

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