Sinistral reactivation of the Transbrasiliano Lineament: Structural and geochronological evidences in the Cariré Granulite Zone, Borborema Province – NE Brazil

Amaral, Wagner da Silva; Kraus, Rita K.; Dantas, Elton Luiz; Fuck, Reinhardt A.; Pitombeira, João Paulo Araújo

doi:10.1016/j.jsames.2017.08.022

Cited by 11 publications

(7 citation statements)

References 42 publications

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“…In the Tauá and Senador Pompeu shear zones, stability of amphibole, quartz recrystallization by grain boundary migration, and feldspar recrystallization by subgrain rotation in gneissic and granitic mylonites indicate deformation under amphibolite facies conditions [80,81]. The Sobral shear zone was reworked at low temperature in a 1.5 km wide mylonitic belt and sinistrally reactivated under brittle/ductile conditions [83]. The Senador Pompeu and Tauá shear zones also show localized superimposition of low-temperature deformation.…”

Section: Shear Zones From the Western Part Of The Northern Subprovince (Ceará Domain)mentioning

confidence: 98%

The Borborema Strike-Slip Shear Zone System (NE Brazil): Large-Scale Intracontinental Strain Localization in a Heterogeneous Plate

et al. 2021

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Large-scale strike-slip faults are fundamental tectonic elements of the continental lithosphere. They constitute plate boundaries (continental transforms), separate terranes with contrasting geological histories within accretionary orogens, or accommodate heterogeneous deformation in intracontinental settings. In ancient orogens, where deeper levels of the crust are exposed, these faults are expressed as shear zones materialized by up to tens of km-wide mylonitic belts. The Borborema shear zone system in northeastern Brazil is one of the largest and best-exposed intracontinental strike-slip shear zone systems in the world, cropping out over 250,000 km2. Here, we review its main geophysical, structural, petrologic, and geochronologic characteristics and discuss the factors controlling its development. This complex continental scale shear zone system is composed of a set of NE- to NNE-trending dextral shear zones from which there are two major E-trending dextral shear zones with horse-tail terminations into the transpressional belt branch, as well as several smaller E-trending dextral and NE-trending dextral and sinistral shear zones. The major shear zones are marked by extensive linear or curvilinear magnetic gradients, implying their continuation at depth. The major shear zones are materialized by migmatite to amphibolite-facies mylonites, but the entire system shows evidence of late deformation at lower temperatures. The system developed during the late stages of the Neoproterozoic Brasiliano (Pan-African) orogeny (mainly from 590 to 560 Ma), postdating by more than 20 Ma the main stage of contractional deformation. Localization of strike-slip shearing in this intraplate setting was controlled by rheological contrasts between blocks with distinct Paleoproterozoic histories, the presence of preorogenic Neoproterozoic rifts, the craton geometry, and zones of enhanced magmatic activity, highlighting the importance of rheological heterogeneity in controlling shear zone nucleation and evolution.

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Section: Shear Zones From the Western Part Of The Northern Subprovince (Ceará Domain)mentioning

confidence: 98%

The Borborema Strike-Slip Shear Zone System (NE Brazil): Large-Scale Intracontinental Strain Localization in a Heterogeneous Plate

et al. 2021

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“…Extensive shear zone networks were developed towards the end of the Brasilia orogeny, which are spatially related to post-collisional granite intrusions of 590 to 510 Ma (e.g., [79][80][81][82]). The other post-collisional and post-Ediacaran episodes are the 460 Ma felsic dykes cross-cut by faults parallel to the main trend of the Transbrasiliano shear zone [83]. These shear zones commonly border Cretaceous intraplate sedimentary basins formed during ductile-to-brittle deformed phases characterized by normal faults overprinting mylonitic foliations [82].…”

Section: The Borborema Province Panafrican Ne Brazilmentioning

confidence: 99%

“…(4) The 590 to 510 Ma extensive shear zoning and post-collisional granitic intrusions [75,[79][80][81] were dated by zircons in the Araru whitish-grey, Babi mica schist, Nkogho I-type anatectic granite, and Otu granitic pegmatite. (5) The 460 Ma felsic dykes cross-cut by faults parallel to the main trend of the Transbrasiliano shear zone [83] were exclusively dated by zircons in Nkogho I-type anatectic granite.…”

Section: Links With Rocks In Ne Brazil and Pre-separation Of The South American And African Platesmentioning

confidence: 99%

New Insights into Pre-to-Post Ediacaran Zircon Fingerprinting of the Mamfe PanAfrican Basement, SW Cameroon: A Possible Link with Rocks in SE Nigeria and the Borborema Province of NE Brazil

et al. 2021

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The pre- to post-Late Neoproterozoic geological histories in the south to southwestern part of Mamfe Basin (SW Cameroon) were reported following analysis of the zircon crystals from their host rocks. A genetic model was developed for the zircon host rocks’ formation conditions, and the registered post-emplacement events were presented. The obtained ages were correlated with the data available for rocks in the Cameroon Mobile Belt, SE Nigeria, and the Borborema Province of NE Brazil. Separated zircons from Araru black to whitish gneiss, Araru whitish-grey gneiss, and Mboifong migmatite were analyzed for their morphology and texture U-Th-Pb composition, and U-Pb ages. Published U-Pb zircon ages for Otu granitic pegmatite, Babi mica schist, and Nkogho I-type anatectic granite were updated. Zircon ages in Araru black to whitish gneiss; Araru whitish-grey, Mboifong migmatite, Babi mica schist, Nkogho I-type anatectic granite, and Otu granitic pegmatite date the Eburnean tectono-magmatic/metamorphic event in Cameroon and SE Nigeria. The Late Paleoproterozoic to Early Mesoproterozoic ages record extensional (continental rift) settings and anorogenic magmatism in the Borborema Province in the NE of Brazil. These ages date collisional phases between the São Francisco–Congo and West African cratons and the Saharan metacraton with metamorphism and magmatism in Cameroon. They also date the Kibarian tectono-magmatic/metamorphism and PanAfrican tectono-magmatic/metamorphism in SE Nigeria. The Late Paleoproterozoic to Early Mesoproterozoic ages date the Cariris Velhos orogeny in the Borborema Province in NE Brazil, with Early Tonian crustal rifting, magmatism, and metamorphism and the collisional phase of the Brasiliano orogeny with syn-collisional plutons and extensive shear zoning and post-collisional granite intrusions.

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“…Nesse intervalo, a reativação transcorrente sinistral do LTB pode ser hipoteticamente atribuída a eventos tardios ou subsequentes a processos colisionais envolvendo o Gondwana ocidental e a Paleo-América do Norte. É interessante citar a observação de falhas transcorrentes sinistrais afetando diques graníticos com possível idade neocarbonífera, que ocorrem na zona de influência do LTB na região noroeste do Ceará (Amaral et al, 2017). O evento deformacional D n+1 é de natureza distensional (distensão próxima de N-S) e de idade eojurássica, baseada na sua superposição e no controle do alojamento dos corpos básicos da Suíte Mosquito.…”

Section: Conclusõesunclassified

“…O LTB intercepta terrenos entre os Crátons Amazônico e São Francisco, adentrando o Paraguai e a Argentina, tendo também continuidade no continente africano (Attoh e Brown, 2008). Sua origem e evolução são amplamente discutidas por diversos autores (Almeida e Carneiro, 2004;Cordani et al, 2013;Castro et al, 2014Castro et al, , 2016Amaral et al, 2017), sendo geralmente atribuídas ao desenvolvimento de zonas de cisalhamento transcorrentes dextrais durante o estágio tardi a pós--colisional da Orogênese Brasiliana, entre o Neoproterozoico e o Cambriano. Ganade de Araújo et al (2014) sugerem que essa estrutura dúctil representaria o registro de uma megassutura associada à formação do Supercontinente Gondwana.…”

Section: Introductionunclassified

Reativações pós-silurianas do Lineamento Transbrasiliano na porção sul da Bacia do Parnaíba

Santos

Sá

Silva

et al. 2018

Geol. USP. Sér. cient.

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Disponível on-line no endereço www.igc.usp.br/geologiausp -71 -Resumo O Lineamento Transbrasiliano (LTB) apresenta direção NE-SW. Cerca de 900 km desse sistema interceptam o substrato da Bacia do Parnaíba (BPar), inferido, a partir de dados geológicos e geofísicos, como uma zona de cisalhamento plástica transcorrente dextral. Este trabalho objetivou abordar a assinatura estrutural e os marcadores estratigráficos associados às reativações do LTB na região sul da bacia, ao leste de Palmas (TO). No embasamento cristalino, um estágio tardio do LTB se expressa como uma zona dúctil-frágil também de cinemática dextral de idade ediacarana-cambriana, no NW do Ceará. Nas unidades litoestratigráficas da BPar são distinguidos eventos de reativação em regime frágil ou hidroplástico. Na região de estudo, um evento mais antigo registra cinemática transcorrente sinistral expressa principalmente como bandas de deformação e falhas com direção NE, combinadas a estruturas dilatacionais (incluindo juntas e falhas normais) ou conjugadas/antitéticas de rejeito direcional ou oblíquo, com orientações que variam de NNE a NNW, todas observadas nos litotipos das Formações Sambaíba e Pedra de Fogo, bem como nas mais antigas. Ao sudeste de Alto Parnaíba (MA) são observadas evidências de atividade tectônica sindeposicional durante o Permiano superior. Um segundo conjunto de estruturas é composto por falhas normais associadas a uma distensão N/NNW, impressas nos corpos básicos de idade eojurássica da Suíte Mosquito, que, por sua vez, é capeada por depósitos com seixos das vulcânicas, correlacionados à Formação Corda. Um terceiro conjunto de estruturas, caracterizado por falhas normais ou oblíquas com direção NE, registra distensão NW, sendo associada ao evento de rifteamento da Margem Leste brasileira, durante o Cretáceo Inferior. Finalmente, um quarto evento, de ocorrência restrita, envolve distensão NE e está registrado em arenitos correlacionados ao Grupo Urucuia, implicando uma idade máxima neocretácea.Palavras-chave: Bacia do Parnaíba; Lineamento Transbrasiliano; Evolução estrutural. AbstractThe Transbrasiliano lineament trends NE-SW, and about 900 km of it occurs in the substrate of the Parnaíba Basin, inferred to be a plastic shear zone with dextral strike-slip kinematics based on geological and geophysical data. This paper addresses the structural signature and age of Transbrasiliano lineament reactivations in the southern region of the basin, east of the city of Palmas. In the crystalline basement, a late, ductile-brittle stage of Transbrasiliano lineament also displays dextral kinematics of ediacara-cambrian age, as observed in NW Ceará State. In the lithostratigraphic units of the Parnaíba Basin, reactivation events under brittle or hydroplastic conditions are recognized. In the studied region, an older event of sinistral transcurrent kinematics is expressed by NE-trending deformation bands and faults, combined with oblique structures, either dilatational (including joints and normal faults) or conjugate/antithetic strike-slip or ob...

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Sinistral reactivation of the Transbrasiliano Lineament: Structural and geochronological evidences in the Cariré Granulite Zone, Borborema Province – NE Brazil

Cited by 11 publications

References 42 publications

The Borborema Strike-Slip Shear Zone System (NE Brazil): Large-Scale Intracontinental Strain Localization in a Heterogeneous Plate

The Borborema Strike-Slip Shear Zone System (NE Brazil): Large-Scale Intracontinental Strain Localization in a Heterogeneous Plate

New Insights into Pre-to-Post Ediacaran Zircon Fingerprinting of the Mamfe PanAfrican Basement, SW Cameroon: A Possible Link with Rocks in SE Nigeria and the Borborema Province of NE Brazil

Reativações pós-silurianas do Lineamento Transbrasiliano na porção sul da Bacia do Parnaíba

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