Calizas Estromatolíticas Y Oolíticas Y Definición De La Formación Arroyo De La Pedrera (?Vendiano, Uruguay )

Montaña, Juan; Sprechmann, Peter

doi:10.25249/0375-7536.1993233306312

Cited by 21 publications

(14 citation statements)

References 5 publications

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“…Instead, the later unit rests directly on an angular unconformity to the pre‐Ediacaran basement. Therefore, following the original name proposed by Montaña & Sprechmann (1993), the Arroyo de la Pedrera Formation (hosting the Piedras de Afilar and the Cerro Victoria units) is elevated to group status and separated from the Arroyo del Soldado Group (Fig. 2).…”

Section: Lithostratigraphy Sedimentology and Palaeontologymentioning

confidence: 97%

“…This lithostratigraphic unit was defined by Gaucher et al. (1996), to include a marine shallowing‐upward sequence ( ca 1500 m) comprising (from base to top) the Polanco Limestone (Goñi & Hoffstetter, 1964), Cerro Espuelitas, Cerros San Francisco (Montaña & Sprechmann, 1993) and Cerro Victoria Formations (Montaña & Sprechmann, 1993). Later, Gaucher et al .…”

Section: Lithostratigraphy Sedimentology and Palaeontologymentioning

confidence: 99%

“…Montaña & Sprechmann (1993) proposed the Arroyo de la Pedrera Formation, which consists of the Cerros San Francisco Member and Cerro Victoria Member. The Cerros San Francisco Member includes sandstones and siltstones, showing well‐preserved sedimentary structures, and represents a fining‐upward and thinning‐upward cycle.…”

Section: Lithostratigraphy Sedimentology and Palaeontologymentioning

confidence: 99%

“…Even though dolomite has not been recognized previously, almost the whole unit is composed of dolostones (‘post‐depositional’ dolomites). The type area is located to the NW of Illescas, in the Florida Department, where a continuous ∼600 m thick succession is exposed (Montaña & Sprechmann, 1993) (location H; Fig. 1B).…”

Section: Lithostratigraphy Sedimentology and Palaeontologymentioning

confidence: 99%

See 3 more Smart Citations

Ediacaran in Uruguay: palaeoclimatic and palaeobiological implications

Peçoits¹,

Gingras²,

Aubet³

et al. 2007

Sedimentology

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The Ediacaran to lowermost Cambrian successions of south-eastern Uruguay preserve an unusual and significant record of deposits generated during the Gondwana assembly (ca 590 to 535 Ma). This study presents a review of data obtained through extensive field-based mapping coupled with detailed sedimentology and stratigraphy of key formations. The geological units within the study area consist of the Maldonado Group (Playa Hermosa, Las Ventanas and San Carlos formations), the Arroyo del Soldado Group (Yerbal, Polanco Limestones, Barriga Negra and Cerro Espuelitas formations) and the Arroyo de la Pedrera Group (Piedras de Afilar and Cerro Victoria formations). The Maldonado Group is characterized by a glacially influenced volcanogenicsedimentary sequence with ice-rafted debris and dropstones in the Playa Hermosa and Las Ventanas formations. The Arroyo del Soldado Group is a mixed siliciclastic-carbonate succession, mainly represented by an intercalation of basal pink dolostones, banded siltstones, rhythmites of dolostone-limestone, iron formations, cherts and conglomerates. Carbonates in the Polanco Limestones Formation are characterized by a negative d 13 C excursion up to )3AE26& PeeDeeBelemnite. The Arroyo de la Pedrera Group consists of quartz arenites and stromatolitic/oolitic dolostones. Preliminary data indicate that the Precambrian-Cambrian could be contained within or at the base of this group. The entire succession is almost 6000 m thick, and contains a rich fossil assemblage composed of organic-walled microfossils and small shelly fauna, including the index fossil Cloudina riemkeae. The stratigraphic and chemostratigraphic features are suggestive of a Gaskier age (ca 580 Ma) for the basal glacial-related units. In this scenario, the results show the importance of lithostratigraphic, biostratigraphic and chemostratigraphic data of these Ediacaran units in the global correlation of terminal Proterozoic sedimentary rocks.

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Section: Lithostratigraphy Sedimentology and Palaeontologymentioning

confidence: 97%

Section: Lithostratigraphy Sedimentology and Palaeontologymentioning

confidence: 99%

Section: Lithostratigraphy Sedimentology and Palaeontologymentioning

confidence: 99%

Section: Lithostratigraphy Sedimentology and Palaeontologymentioning

confidence: 99%

See 2 more Smart Citations

Ediacaran in Uruguay: palaeoclimatic and palaeobiological implications

Peçoits¹,

Gingras²,

Aubet³

et al. 2007

Sedimentology

View full text Add to dashboard Cite

show abstract

“…As formações Cerro de San Francisco (arenitos) e Cerro Victória (carbonatos com estromatól¡to e oords parcialmente silicificados), originalmente descritos como Formação Arroyo de la Pedrera (Montaña & Sprechmann 1993), ocorrem em lllescas. Nesta localidade, pôde-se identificar que os carbonatos tornam-se progressivamente silicificados para o topo, onde predominam estromatólitos de formas diversas e ooids (Gaucher ef a/.…”

Section: O 1mmunclassified

Análise Estratigráfica da Bacia Corumbá (Neoproterozóico) - Mato Grosso do Sul

Boggiani¹,

Coimbra²

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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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Calizas Estromatolíticas Y Oolíticas Y Definición De La Formación Arroyo De La Pedrera (?Vendiano, Uruguay )

Cited by 21 publications

References 5 publications

Ediacaran in Uruguay: palaeoclimatic and palaeobiological implications

Ediacaran in Uruguay: palaeoclimatic and palaeobiological implications

Análise Estratigráfica da Bacia Corumbá (Neoproterozóico) - Mato Grosso do Sul

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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