The Río de la Plata Craton: a review of units, boundaries, ages and isotopic signature

Oyhantçabal, Pedro; Siegesmund, Siegfried; Wemmer, Klaus

doi:10.1007/s00531-010-0580-8

Cited by 193 publications

(212 citation statements)

References 60 publications

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“…The Taquarembó block is made up of the Santa Maria Chico (Nardi & Hartmann 1979) and the Valentines-Rivera metamorphic complexes (Oyhantçabal et al 2011a; Fig. 1C).…”

Section: Different Blocks and Basement Rocksmentioning

confidence: 99%

“…The Pavas block is constituted by amphibolite-facies metamorphic rocks (i.e., the La China complex) made up of mafic orthogneisses with bulk tonalite-trondhjemite-granodiorite (TTG) protolith composition and U-Pb (SHRIMP in zircon) ages between 3.0 and 2.7 Ga (Hartmann et al 2001, Mallmann et al 2007, Gaucher et al 2011, Oyhantçabal et al 2011a, Oriolo et al 2016a). This complex outcrops mainly westward of the Maria Albina Shear Zone (Fig.…”

Section: Different Blocks and Basement Rocksmentioning

confidence: 99%

“…1), has exponentially increased (Hartmann et al 2001, Mallmann et al 2007, Oyhantçabal et al 2009, 2011a, 2011b, Gaucher et al 2011, Aubet et al 2012, Rapalini et al 2015, Peçoits et al 2016, Oriolo et al 2016a, 2016b. A review of the currently available information leads to the conclusion that, although variable, the stratigraphy, the distribution and the age of these units remain ambiguous (Aubet et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Lithologies, structure and basement-cover relationships in the schist belt of the Dom Feliciano Belt in Uruguay

et al. 2017

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This work is the result of a multiyear effort to use field geology to describe lithologies, to establish contact relationships and to create a sketch of the tectonic evolution of the Meso-to Neoproterozoic metasedimentary successions within the Schist Belt of the Dom Feliciano Belt. This low-grade metamorphic cover rests on the high-grade metamorphic basement of the La China and Las Tetas complexes. This basement is Archean-Paleoproterozoic in age. The Schist Belt is overlapped unconformably by the Barriga Negra formation. The Lavalleja complex and the Barriga Negra formation both deformed together during the D2 deformation event (~ 570 -540 Ma), but the Barriga Negra only partially recorded the D2 transpressive event, whereas the Lavalleja complex was affected by both the D1 tangential event and the D2 event. Event D1 would have developed a fold nappe with vergence to the south. This hypothesis is supported by different structures: (i) recumbent and upright folds oriented E-W, (ii) subhorizontal mylonitic foliation in marbles (calc-schists), (iii) stretching lineations plunging towards the SW in metaconglomerates of the Las Tetas Complex, and (iv) a reworking of the subhorizontal foliation parallel to the Sarandí del Yí strike-slip shear zone.KEYWORDS: Dom Feliciano Belt; Ediacaran; Deformation; Fold nappe; Tectonic evolution. RESUMO: Este trabalho resulta de um esforço de vários anos tentando usar a geologia de campo para descrever litologias, estabelecer relações de contato e perfazer a evolução tectônica das sucessões metassedimentares, de idades meso a neoproterozoicas, que foram deformadas dentro da Faixa de Xistos do Cinturão Dom Feliciano. Essas rochas constituem uma cobertura de baixo grau que repousa em cima do embasamento de alto grau metamórfico dos complexos La China e Las Tetas. Esse embasamento é de idade paleoproterozoica-arqueana. A Faixa de

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“…The Taquarembó block is made up of the Santa Maria Chico (Nardi & Hartmann 1979) and the Valentines-Rivera metamorphic complexes (Oyhantçabal et al 2011a; Fig. 1C).…”

Section: Different Blocks and Basement Rocksmentioning

confidence: 99%

Section: Different Blocks and Basement Rocksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lithologies, structure and basement-cover relationships in the schist belt of the Dom Feliciano Belt in Uruguay

et al. 2017

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“…Today the western domain is known as Rio de la Plata Craton (Almeida et al 1973;Bossi and Ferrando 2001;Oyhantçabal et al 2010), which extends westwards into Argentina. The eastern domain is divided into the Nico Pérez and Punta del Este Terranes (Bossi and Ferrando 2001;Oyhantçabal et al 2010).…”

Section: Geological Settingmentioning

confidence: 99%

“…The eastern domain is divided into the Nico Pérez and Punta del Este Terranes (Bossi and Ferrando 2001;Oyhantçabal et al 2010). A mobile belt known as the Dom Feliciano Belt is located between these two terranes (Fragoso César 1980;Oyhantçabal et al 2009Oyhantçabal et al , 2010.…”

Section: Geological Settingmentioning

confidence: 99%

Granitic dimensional stones in Uruguay: evaluation and assessment of potential resources

Demarco

Oyhantçabal

Stein³

et al. 2012

Environ Earth Sci

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In Uruguay commercial granite varieties comprise mafic rocks, granitoids, and syenitoids. There is a long tradition in Uruguay, as well as worldwide, of using dimensional stones in architecture and art, specially granitic ones. Some of the present applications of these dimensional stones are as façade cladding, countertops, and outdoor and indoor floor slabs. The color spectrum of the Uruguayan granitic dimensional stones varies from black to light gray, covering a wide variety of red and pink and minor greenish-gray. The décor of these granitic dimensional stones is mainly determined by their fabric, fundamentally the grain size and the color distribution between the different minerals that compose the rocks. In the present research the most important commercial granites were sampled to analyze their petrography and petrophysical properties. A detailed structural analysis has been performed in several deposits, as well as the application of the software 3D Block Expert for modeling the possible raw block size distribution. Other factors controlling the mining viability of the deposits were also studied (e.g., homogeneity/heterogeneity of color and décor) and the possible reserves were calculated.

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Timing of deformation in the Sarandí del Yí Shear Zone, Uruguay: Implications for the amalgamation of western Gondwana during the Neoproterozoic Brasiliano‐Pan‐African Orogeny

et al. 2016

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U‐Pb and Hf zircon (sensitive high‐resolution ion microprobe ‐SHRIMP‐ and laser ablation‐inductively coupled plasma‐mass spectrometry ‐LA‐ICP‐MS‐), Ar/Ar hornblende and muscovite, and Rb‐Sr whole rock‐muscovite isochron data from the mylonites of the Sarandí del Yí Shear Zone, Uruguay, were obtained in order to assess the tectonothermal evolution of this crustal‐scale structure. Integration of these results with available kinematic, structural, and microstructural data of the shear zone as well as with geochronological data from the adjacent blocks allowed to constrain the onset of deformation along the shear zone at 630–625 Ma during the collision of the Nico Pérez Terrane and the Río de la Plata Craton. The shear zone underwent dextral shearing up to 596 Ma under upper to middle amphibolite facies conditions, which was succeeded by sinistral shearing under lower amphibolite to upper greenschist facies conditions until at least 584 Ma. After emplacement of the Cerro Caperuza granite at 570 Ma, the shear zone underwent only cataclastic deformation between the late Ediacaran and the Cambrian. The Sarandí del Yí Shear Zone is thus related to the syncollisional to postcollisional evolution of the amalgamation of the Río de la Plata Craton and the Nico Pérez Terrane. Furthermore, the obtained data reveal that strain partitioning and localization with time, magmatism emplacement, and fluid circulation are key processes affecting the isotopic systems in mylonitic belts, revealing the complexity in assessing the age of deformation of long‐lived shear zones.

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The Río de la Plata Craton: a review of units, boundaries, ages and isotopic signature

Cited by 193 publications

References 60 publications

Lithologies, structure and basement-cover relationships in the schist belt of the Dom Feliciano Belt in Uruguay

Lithologies, structure and basement-cover relationships in the schist belt of the Dom Feliciano Belt in Uruguay

Granitic dimensional stones in Uruguay: evaluation and assessment of potential resources

Timing of deformation in the Sarandí del Yí Shear Zone, Uruguay: Implications for the amalgamation of western Gondwana during the Neoproterozoic Brasiliano‐Pan‐African Orogeny

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