Tracing the continental margins of the Southern Ribeira belt, Brazil: Provenance and connections of post-Rodinia fragments

Santos, Larissa da Rocha; Cury, Leonardo Fadel; Rosenblume, Justin; Mendes, Marcela Trindade; Fedalto, Guilherme; Lopes, Angela Pacheco; Leandro, Renato; Siga, Oswaldo; Basei, Miguel Ângelo Stipp

doi:10.1016/j.precamres.2022.106756

Cited by 3 publications

(13 citation statements)

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“…(c) Regional tectonic framework of the southern Brazilian terranes and cratonic blocks (Gaucher et al, 2021;Passarelli et al, 2011). [Color figure can be viewed at wileyonlinelibrary.com] attached to the Angola craton during Late Meso-to Neoproterozoic times (Leandro, 2016;Passarelli et al, 2018;Santos et al, 2022). Subsequently, the Capiru Group was deformed during the Brasiliano-Pan African orogenies (Ediacaran to Cambrian), which culminated in the amalgamation of Western Gondwana (Basei et al, 2008;Brito Neves et al, 1999;Fuck et al, 2008;Passarelli et al, 2018).…”

Section: Geological Setting and Age Constraintsmentioning

confidence: 99%

“…Two main basin stages are identified within the metasedimentary record: a passive continental margin stage, with increasing tectonic quiescence followed by a marine regression, and a syn-orogenic stage at the Curitiba-Angola craton margin (Santos et al, 2022).…”

Section: Geological Setting and Age Constraintsmentioning

confidence: 99%

“…ii. the development of a paleo-karst relief was linked to the uplift related to an active margin onsetting on the northern margin of the Curitiba-Angola block during the Brasiliano orogenies (Passarelli et al, 2018;Santos et al, 2022). This event likely played a role in the erosion and redistribution of the pre-existing weathered materials on the cratonic areas, changing the regolithlandscape relationships.…”

Section: Spatial Distribution Of the Morro Azul Paleoweathering Surfa...mentioning

confidence: 99%

“…The main goal of this study was to identify pedogenic textures and mineralogical trends from an erosional contact related to the Pre‐Morro Azul disconformity—a significant regional surface that bounds two basin‐stages: a passive margin stage followed by the onset of an active margin during the Brasiliano–Pan African orogenies (Passarelli et al, 2018; Santos et al, 2022). We hope these distinguished features might be helpful for the purpose of stratigraphic correlation and regional unconformity recognition in highly deformed and metamorphosed terrains.…”

Section: Introductionmentioning

confidence: 99%

“…The chemical and mineralogical compositions of the metapelites display Fe‐ and Al‐rich enrichments suggesting continental denudation after the passive continental margin stage, with high chemical index of alteration (CIA) values (>80) and low sediment input rates sourced from a relatively low‐gradient relief, highly weathered continental source, stable since Mesoproterozoic times (Santos, Leandro, et al, 2021). Provenance analysis based on detrital zircon geochronology have shown that sediment input is predominantly sourced from the Curitiba‐Angola cratonic areas (Santos et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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The formation and evolution of Al‐rich protoliths in the southern Ribeira belt, Brazil: Insights from remnants of a Precambrian paleoweathering surface

Santos,

Fedalto,

Bahniuk

et al. 2023

Earth Surf Processes Landf

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Bauxitic clays, clayey bauxites and bauxites are residual products formed from the weathering of aluminosilicate‐rich parent rocks under wet and warm conditions. These deposits show a complex interplay between remobilisation of pre‐existing kaolinitic soils and depositional micro‐environments.In the southern Ribeira belt, Brazil, a paleoweathering surface developed on the continental shelf of the Capiru Group passive margin strata and on its basement/source rocks. This weathering cycle gave rise to a paleosol profile on the continental domain and a karstic paleotopography on the emerged carbonate shelf. The surface and karstic nets were later caped and filled with Al‐rich materials, typical of remobilised soils, bauxitic clays, clayey bauxites and pods of karst‐type bauxites.The age of the disconformity is Pre‐Brazilian/Pan‐African, implying a Neoproterozoic age for the weathering surface. In this study, we investigate the relationship among disconformities, paleosols and karst topography to better understand the stratigraphic control, chemical composition and mineralogy of the Al‐rich materials. We interpret this horizon as the remnants of a (meta‐)paleoweathering surface that can serve as a valuable key bed for stratigraphic correlation and paleogeographic reconstructions.We propose that the triggering process for the genesis of the paleosol profiles, bauxitic material and bauxite pods was a coupled mechanism between favourable climate and uplift along the northern margin of the Curitiba–Angola craton, creating a karstic topography that allowed the down‐plain transport of Al‐rich materials. In a later stage, these deposits were metamorphosed, developing a series of Al silicates in unusual paragenesis, typical of Al‐rich protoliths.The presence of these paragenesis, along with the recognition of the disconformity–paleoweathering surface pair, could be a useful tool to understand the paleoenvironmental and paleogeographic evolution of highly deformed terrains.

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Section: Geological Setting and Age Constraintsmentioning

confidence: 99%

Section: Geological Setting and Age Constraintsmentioning

confidence: 99%

Section: Spatial Distribution Of the Morro Azul Paleoweathering Surfa...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The formation and evolution of Al‐rich protoliths in the southern Ribeira belt, Brazil: Insights from remnants of a Precambrian paleoweathering surface

Santos,

Fedalto,

Bahniuk

et al. 2023

Earth Surf Processes Landf

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Petrogenesis, geochronology, and tectonic setting of the Calymmian 1.45–1.50 Ga basic magmatism in the Southern Ribeira Belt, Brazil: evidence of intracontinental rifting and Columbia break-up

Fedalto,

Cury,

da Rocha Santos

et al. 2024

International Geology Review

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Advancing geological and structural understanding of the Atuba Complex: a study in the Curitiba Terrane of the Southern Ribeira Belt, Southern Brazil

Tissi Baldin,

Salamuni,

Lagoeiro

et al. 2024

Braz. J. Geol.

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The Atuba Complex occurs in the eastern region of Paraná State, located in the Southern Ribeira Belt. It is comprised of the Curitiba Terrane, northward of the Luís Alves Terrane, and southward of the Apiaí Terrane. This research was carried out by means of detailed petrography, microtectonics, and brittle and ductile structural analysis. The Atuba Complex is composed of migmatites, felsic granulites, granitoids, quartzites, phyllonites, schists, amphibolites, and cataclasites. The lithotypes are cut by diabase or gabbro dikes, lamprophyre dikes, pseudotachylites, and quartz, epidote, carbonate, or chlorite veins. The migmatites are characterized by two migmatization phases, the first composed of tonalitic leucosomes and the second formed by granitic leucosomes. The stromatic and mylonitized migmatites suggest dislocation creep mechanisms and dynamic recrystallization processes, mainly in quartz and feldspars. During the initial phase, melting reactions took place through dehydration, while in the subsequent phase, melting was facilitated by the presence of water-fluxed. The Atuba Complex comprises two foliations, S n-1 (D n-1 phase) and S n (D n phase). The S n-1 surface (compositional banding) presents a ductile and anastomosed aspect with an N45W/55NE attitude, whereas the S n mylonitic foliation is defined by the presence of mineral flattening or stretching and by the orientation of amphibole and biotite shapes, with a maximum plane of N45E/85NW. The observed faults and fractures strike in the NE-SW and NW-SE main directions. The paleostress study provided the recognition of a NE-SW sigma 1 associated with a NW-SE-striking sigma 3 for the left-lateral strike-slip faults and an E-W compressive SHMAX and an N-S distensive SHMIN for the right-lateral strike-slip faults.

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Tracing the continental margins of the Southern Ribeira belt, Brazil: Provenance and connections of post-Rodinia fragments

Cited by 3 publications

References 131 publications

The formation and evolution of Al‐rich protoliths in the southern Ribeira belt, Brazil: Insights from remnants of a Precambrian paleoweathering surface

The formation and evolution of Al‐rich protoliths in the southern Ribeira belt, Brazil: Insights from remnants of a Precambrian paleoweathering surface

Petrogenesis, geochronology, and tectonic setting of the Calymmian 1.45–1.50 Ga basic magmatism in the Southern Ribeira Belt, Brazil: evidence of intracontinental rifting and Columbia break-up

Advancing geological and structural understanding of the Atuba Complex: a study in the Curitiba Terrane of the Southern Ribeira Belt, Southern Brazil

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