The geology of the Capiru Group, Curitiba Terrane, Southern Ribeira Belt (Brazil)

Santos, Larissa da Rocha; Spisila, André Luis; Guimarães, Daniel Patias; Szameitat, Luizemara Soares Alves; Bongiolo, Alessandra de Barros e Silva; Cury, Leonardo Fadel

doi:10.1080/17445647.2021.1982036

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…The Capiru Formation (Bigarella and Salamuni 1956) or Capiru Group (Santos et al 2021) is a low-grade metasedimentary unit that outcrops in the Curitiba Terrain and records passive to active stages of the continental margin. It was deposited on the northern margin of the Curitiba Terrane, with an "exotic" Mesoproterozoic contribution (Santos et al 2022).…”

Section: Regional Geologymentioning

confidence: 99%

“…It was deposited on the northern margin of the Curitiba Terrane, with an "exotic" Mesoproterozoic contribution (Santos et al 2022). The lithostratigraphic units of the Capiru Group reflect depositional and tectonic events, which involved passive deposition of the continental margin; compressive episodes during the Late Neoproterozoic; and extensional tectonic processes, which culminated in the opening of the Proto-Atlantic Ocean (Santos et al 2021).…”

Section: Regional Geologymentioning

confidence: 99%

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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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Section: Regional Geologymentioning

confidence: 99%

Section: Regional Geologymentioning

confidence: 99%

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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“…Geological context of the Capiru Group, southern Ribeira belt (Brasiliano – Pan‐African), Brazil. (a) Simplified geology of the Capiru Group (adapted from Santos, Spisila, et al, 2021 and Caltabelotta et al, 2017) and location of the studied profiles. The XY coordinates of the sections can be consulted in Table 1.…”

Section: Introductionmentioning

confidence: 99%

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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Chemostratigraphic contributions to paleoenvironmental assessment of microbialites from neoproterozoic Capiru Formation, Southern Ribeira Belt – Brazil

Lange

Diório

Bahniuk

et al. 2023

Journal of South American Earth Sciences

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The geology of the Capiru Group, Curitiba Terrane, Southern Ribeira Belt (Brazil)

Cited by 4 publications

References 26 publications

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

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

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

Chemostratigraphic contributions to paleoenvironmental assessment of microbialites from neoproterozoic Capiru Formation, Southern Ribeira Belt – Brazil

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