Evidence of a Palaeoproterozoic SLIP, northern Amazonian Craton, Brazil

Barbosa, Nazaré Alves; Fuck, R. A.; Souza, Valmir da Silva; Dantas, Elton Luiz; Júnior, Stélio Soares Tavares

doi:10.1016/j.jsames.2021.103453

Cited by 6 publications

(2 citation statements)

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“…On the other hand, Santos et al (2004) correlate the Creporizão (Tapajós Domain) and Pedra Pintada (Orocaima Igneous Belt) suites, suggesting a continental magmatic arc at ~1.97 Ga (Mundurucus Orogeny) in Tapajós-Parima Province. Teixeira et al (2019) and Barbosa et al (2021) considered the Orocaima Igneous Belt a silicic large igneous province (SLIP; sensu Bryan and Ernst 2008). The lithochemistry (intermediate to acid) and the significant large geographic occurrence are considered to support the Orocaima SLIP interpretation.…”

Section: Tectonic Overviewmentioning

confidence: 99%

“…Some authors assigned these deformational features to the K'Mudku Intracontinental Orogeny (i.e., Santos et al 2000). However, studying the volcanic rocks of the region, Barbosa (2020) and Barbosa et al (2021) described only rheomorphic folds and interpreted that most of the succession, at least in the central portion of the Orocaima Igneous Belt, is preserved from tectonic deformation. Fraga et al (2009Fraga et al ( , 2017c, Klein et al (2012), Reis et al (2013), andTeixeira et al (2019).…”

Section: Structural Framework Reports In the Literaturementioning

confidence: 99%

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The structural framework of the north-central Guiana Shield: a fossil fold-and-thrust belt in northeastern Roraima state, Brazil

Mendes¹,

Oliveira²,

Almeida³

et al. 2022

JGSB

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The northeastern Roraima state (Brazil), located in the north-central portion of Guiana Shield, shows shallow-granitoids and associated volcanic rocks of the Orocaima Igneous Belt (2.00-1.96 Ga) overlaid by the Arai Formation sedimentary succession (1.96-1.87 Ga). Previous authors suggested a compressional event affecting the region. Meanwhile, recent papers interpreted that transpressional deformation, related to a distal effect of a Late Mesoproterozoic tectonics (K'Mudku Event), reactivated some basement structures and generated drag folds in the supracrustal successions. This paper presents a multi-scale approach to the best-exposed sector of this geological framework, gathering and analyzing new data from the regional photointerpretation to the thin section scales. The structural data reveal the fractal character and the rheological control on the E-W-and ESE-WNW-trending compressional structures. The southern domain presents sub-vertical shear zones with down-dip to oblique lineation, which are related to the uplift of the shallow-granitoids in relation to the coeval volcanic successions. The central domain, where the volcanic succession crops out, exhibits ubiquitous E-W-to ESE-WNWtrending sub-vertical foliation parallel to the axial plane of the folds. The southern border of the northern domain (Arai Formation) shows spaced cleavage and gentle folds, besides sub-horizontal thrust faults. The structures reveal a fold-and-thrust belt that presents a transition from thick-to thin-skinned tectonics with mass transport to the north. These geometric relations do not match with the K'Mudku lineaments, usually following a NE-SW direction in the north-central Guiana Shield. However, the southward Middle Orosirian structural framework (Uatumã-Anauá Domain) shows similar geometric relations with nearly E-W-trending lineaments and parallel sub-vertical foliation.

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