Two generations of mafic dyke swarms in the Southeastern Brazilian coast: reactivation of structural lineaments during the gravitational collapse of the Araçuaí-Ribeira Orogen (500 Ma) and West Gondwana breakup (140 Ma)

Santiago, Raíssa; Caxito, Fabrício de Andrade; Neves, Mirna Aparecida; Dantas, Elton Luiz; Júnior, Edgar Batista de Medeiros; Queiroga, Gláucia Nascimento

doi:10.1016/j.precamres.2019.105344

Cited by 26 publications

(15 citation statements)

References 54 publications

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“…Besides this activity, tectonic reactivation and mafic intrusions took place in the Cambrian Colatina Fracture Zone, in the eastern Araçuaí Orogen (Fig. 2: 21, Santiago et al, 2019;Mendes, 2017). A reheating effect of these magmatic events in the hosting basement has hitherto not been observed (Amaral-Santos et al, 2019;Van Ranst et al, 2020a).…”

Section: Post-cambrian Evolution and Existing Thermochronological Datamentioning

confidence: 99%

Differential Phanerozoic evolution of cratonic and non-cratonic lithosphere from a thermochronological perspective: São Francisco Craton and marginal orogens (Brazil)

et al. 2021

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The São Francisco Craton (SFC) and its marginal Araçuaí and Brasília orogens exhibit a significant diversity in their lithospheric architecture. These orogens were shaped during the Neoproterozoic-Cambrian amalgamation of West Gondwana. The rigid cratonic lithosphere of the SFC and the relatively weak lithosphere of the Araçuaí Orogen were disrupted during the Cretaceous opening of the South Atlantic Ocean, whereas the Brasília Orogen remained in the continental hinterland. In earlier research, the thermal effects of the Phanerozoic reactivations in the shallow crust of the Araçuaí Orogen have been revealed by low-temperature thermochronology, mainly by apatite fission track (AFT) analysis. However, analyses from the continental interior are scarce. Here we present new AFT data from forty-three samples from the Brasília Orogen, the SFC and the Araçuaí Orogen, far from the passive margin of the Atlantic coast (~150 to 800 km). Three main periods of basement exhumation were identified: (i) Paleozoic, recorded both by samples from the SFC and Brasília Orogen; (ii) Early Cretaceous to Cenomanian, recorded by samples from the Araçuaí Orogen; and (iii) Late Cretaceous to Paleocene, inferred in samples from all domains. We compare the differential exhumation pattern of the different geotectonic provinces with their lithospheric strengths. We suggest that the SFC likely concentrated the Meso-Cenozoic reactivations in narrow weak zones while the Araçuaí Orogen displayed a far-reaching Meso-Cenozoic deformation. The Brasília Orogen seems to be an example of a stronger orogenic lithosphere, inhibiting reworking, confirmed by our new AFT data. Understanding the role of the lithosphere rigidity may be decisive to comprehend the processes of differential denudation and the tectonic-morphological evolution over Phanerozoic events.

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Section: Post-cambrian Evolution and Existing Thermochronological Datamentioning

confidence: 99%

Differential Phanerozoic evolution of cratonic and non-cratonic lithosphere from a thermochronological perspective: São Francisco Craton and marginal orogens (Brazil)

et al. 2021

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“…The dykes are interpreted as the result of the orogenic collapse of the Araçuaí Belt during the Cambrian and the opening of the South Atlantic Ocean during Early Cretaceus respectively. Therefore, they show recurrent episodes of brittle deformation of which precise timing and kinematic relations remain unclear (Calegari et al, 2016; Lourenço et al, 2016; Santiago et al, 2020).…”

Section: Geological Settingmentioning

confidence: 99%

“…In the present‐day onshore basement domain, early Cretaceous dykes along the Vitória‐Colatina lineament yield Ar–Ar ages ranging 136–128 Ma and were emplaced under slightly dextral oblique extension (Almeida et al, 2013). The Castelo dyke swarm reveals a U–Pb Concordia age of 141 ± 1.9 Ma (Santiago et al, 2020). Both dyke swarms have geochemical signatures and ages similar to other Upper Jurassic/Lower Cretaceous dyke swarms of the Brazilian coast (Almeida et al, 2013) and to the basalt floods of the Paraná‐Etendeka Large Igneous Province (LIP), of which ages ranges from 135 to 131 Ma (Matos, 2021 and references therein).…”

Section: Geological Settingmentioning

confidence: 99%

“…Hence, the seismic architecture of syn‐rift horizons and successions is interpreted and compared with some classic publications on tectono‐stratigraphy of rift basins (Gawthorpe & Leeder, 2008; Lambiase, 1990; Martins‐Neto & Catuneanu, 2010; Morley, 2002; Prosser, 1993). Also, studies on the Phanerozoic brittle reactivations and dyke emplacement in the adjacent onshore Precambrian basement (Calegari et al, 2016; Santiago et al, 2020) and magmatism in the Campos Basin (Almeida et al, 2013; Matos, 2021) are considered for a comprehensive understanding of the constraints of basin evolution. Such a comprehensive approach is necessary due to the poor geochronological control for the onset of rifting.…”

Section: Introductionmentioning

confidence: 99%

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Tectono‐stratigraphic evolution of the rift and post‐rift systems in the Northern Campos Basin, offshore Brazil

Strugale

Cartwright

2022

Basin Research

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“…Preexisting structures in the crystalline basement may control the structural framework of crustal extension, as they also possibly work as magma conduits (Giro et al 2021). Therefore, dikes tend to be emplaced within or near the major mechanical anisotropy planes, such as faults, shear zones, and joints (Calegari et al 2016;Santiago et al 2020).…”

Section: Stress Fields and Morphological Analysesmentioning

confidence: 99%

Stress states during the emplacement of the eastern Rio Ceará-Mirim dike swarm, Borborema Province, northeastern Brazil

Vasconcelos¹,

Souza²,

Santos³

et al. 2022

JGSB

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The Rio Ceará-Mirim dike swarm (RCMDS) of the Borborema Province is a suite of subvertical intrusions classically described in the state of Rio Grande do Norte as E-W-trending dikes, up to southern Ceará, progressively deflecting to NE-SW. The rifting processes involving the Atlantic Ocean opening in the Early Cretaceous is responsible for the Northeast Brazilian Rift System (NBRS) and RCMDS development. This paper investigates the morphological styles and stress states in eastern RCMDS, focusing on well-preserved dikes at the localities of Rio Salgado and Lajes (state of Rio Grande do Norte). Remote sensing techniques, fieldwork, and numerical models aimed to obtain data to propose correlations between the eastern RCMDS emplacement and the NBRS tectonic settling in the Early Cretaceous. The studied dikes are predominantly tholeiitic basalt-diabase ranging from a few centimeters to 150 meters in thickness, locally achieving tens of kilometers in length. Their morphological styles vary from symmetrical to asymmetrical, from sharp and straight to anastomosing/braided dikes, showing diverse en echelon patterns, steps, horns, bridges, and bridge xenoliths. Fractal analysis of the dikes framework indicate syn-magmatic strike-slip components. The majority of morphological markers and the average orientation of the Rio Salgado dikes indicate a NNS-SSW (010 Az) orientation for the least compressive axis and dextral displacements. Based on some occurrences of en echelon dikes showing syn-emplacement stages in the extension direction, we propose three main stages for the least compressive axis -initially oriented to NW-SE, changing to N-S, and finally to NNE-SSW. Mechanical models indicate that the eastern RCMDS were emplaced in deviatoric stress with low/intermediate fluid pressure (Pf < σ2), which is in agreement with the observed morphological patterns.Stress states during the emplacement of the eastern Rio Ceará-Mirim dike swarm, Borborema Province, northeastern Brazil

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Two generations of mafic dyke swarms in the Southeastern Brazilian coast: reactivation of structural lineaments during the gravitational collapse of the Araçuaí-Ribeira Orogen (500 Ma) and West Gondwana breakup (140 Ma)

Cited by 26 publications

References 54 publications

Differential Phanerozoic evolution of cratonic and non-cratonic lithosphere from a thermochronological perspective: São Francisco Craton and marginal orogens (Brazil)

Differential Phanerozoic evolution of cratonic and non-cratonic lithosphere from a thermochronological perspective: São Francisco Craton and marginal orogens (Brazil)

Tectono‐stratigraphic evolution of the rift and post‐rift systems in the Northern Campos Basin, offshore Brazil

Stress states during the emplacement of the eastern Rio Ceará-Mirim dike swarm, Borborema Province, northeastern Brazil

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Two generations of mafic dyke swarms in the Southeastern Brazilian coast: reactivation of structural lineaments during the gravitational collapse of the Araçuaí-Ribeira Orogen (500 Ma) and West Gondwana breakup (140 Ma)

Cited by 26 publications

References 54 publications

Differential Phanerozoic evolution of cratonic and non-cratonic lithosphere from a thermochronological perspective: São Francisco Craton and marginal orogens (Brazil)

Differential Phanerozoic evolution of cratonic and non-cratonic lithosphere from a thermochronological perspective: São Francisco Craton and marginal orogens (Brazil)

Tectono‐stratigraphic evolution of the rift and post‐rift systems in the Northern Campos Basin, offshore Brazil

Stress states during the emplacement of the eastern Rio Ceará-Mirim dike swarm, Borborema Province, northeastern Brazil

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Two generations of mafic dyke swarms in the Southeastern Brazilian coast: reactivation of structural lineaments during the gravitational collapse of the Araçuaí-Ribeira Orogen (500 Ma) and West Gondwana breakup (140 Ma)