Provenance of the Arroyo del Soldado Group (Ediacaran to Cambrian, Uruguay): Implications for the paleogeographic evolution of southwestern Gondwana

Blanco, Gonzalo; Rajesh, H.M.; Gaucher, Claudio; Germs, Gerard J.B.; Chemale, Farid

doi:10.1016/j.precamres.2009.03.003

Cited by 84 publications

(69 citation statements)

References 65 publications

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“…This fact opposes the idea of an intraformational wedge within the Arroyo del Soldado Group (Gaucher et al 2008). Meanwhile, the Neoproterozoic detrital zircons indicate a minimum provenance age of 566 Ma (Blanco et al 2009), which may approach the age of deposition. The appearance of metapelite clasts of the Yerbal Formation in the conglomerates confirms that the Barriga Negra formation is clearly a younger unit.…”

Section: Discussionmentioning

confidence: 67%

“…Many authors agree that an angular unconformity underlies the ripple-bearing quartzites of the Lavalleja complex (Spoturno et al 1986, Aubet et al 2012, Peçoits et al 2016, which is essential to fix the boundary beneath the Cryogenian-Ediacaran units (such as the "Yerbal formation") and their older basement, as shown by the scarce zircon grains of ~600 Ma ages contained in those units (Blanco et al 2009). This contact has been inferred indirectly in some areas (e.g., the Buena Vista-Orthez and Villalba Areas).…”

Section: Discussionmentioning

confidence: 99%

“…Based on detrital zircon contents (Basei et al 2005, Blanco et al 2009, Rapalini et al 2015, Peçoits et al 2016, the clearly discordant formations are younger than ~ 580 Ma (i.e., the Las Ventanas, Barriga Negra, San Carlos and Playa Hermosa formations); others could be younger than ~ 620 Ma (i.e., the Rocha group). Meanwhile, the preorogenic successions (e.g., the Minas formation) provide only zircons older than 1.7 Ga.…”

Section: Ediacaran Cover Successionsmentioning

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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Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 99%

Section: Ediacaran Cover Successionsmentioning

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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“…Detrital zircon U-Pb ages of the lower Barriga Negra Formation provide a maximum age constraint of 566 ± 8 Ma (Blanco et al 2009). Cloudina riemkeae, index fossil of the late Ediacaran (Grant 1990;), occurs in the upper Yerbal Formation and in the lower-middle Polanco Formation (Gaucher & Poiré 2009a).…”

Section: Arroyo Del Soldado Group (Uruguay)mentioning

confidence: 99%

Correlations of some Neoproterozoic carbonate-dominated successions in South America based on high-resolution chemostratigraphy

Sial

Gaucher²,

Misi

et al. 2016

Braz. J. Geol.

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This report reviews and incorporates new elemental and isotope chemostratigraphic data for correlation of Neoproterozoic carbonate-dominated successions in South America (Argentina, Bolivia, Brazil, Paraguay and Uruguay). These thick mixed carbonate/siliciclastic successions were largely deposited in epicontinental basins or accumulated on passive margins on the edges of cratons (e.g. São Francisco, Amazonia, Rio Apa Block, Pampia and Río de la Plata paleocontinents) during extensional events related to the rifting of the Rodinia Supercontinent. From the stratigraphic point of view, these successions occur as three mega-sequences: glaciogenic, marine carbonate platform (above glaciomarine diamictites or rift successions), and dominantly continental to transitional siliciclastics. In the orogenic belts surrounding cratons, carbonate-dominated successions with important volcanoclastic/siliciclastic contribution have been, in most cases, strongly deformed. The precise ages of these successions remain a matter of debate, but recently new paleontological and geochronological data have considerably constrained depositional intervals. Here, we report high-resolution C, O, Sr, and S isotope trends measured in well-preserved sample sets and mainly use Sr and C isotopes RESUMO: Esta revisão incorpora novos dados isotópicos e quími-cos para correlação quimioestratigráfica de sucessões

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“…The results show a similar distribution pattern with that of the Peijianchang section ( Figure 6). Moreover, the highest-degree research of the Ediacaran Polcanco limestones in Uruguay was reported within the age of 590-560 Ma [50][51][52][53], which deposited after the Gaskiers glaciation. Natilie et al [54] did detailed chemical analysis for the carbonates in Uruguay and observed that the dolomites δ 13 C values vary from −2.7‰ to 0.2‰ and δ…”

mentioning

confidence: 99%

Carbon and oxygen isotopes analyses for the Sinian carbonates in the Helan Mountain, North China

et al. 2013

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We conducted detailed studies of the Sinian carbonates from the Helan Mountain, Ningxia by both field investigation and laboratory analyses of carbon and oxygen isotopes. The carbon isotopic compositions of the Sinian Zhengmuguan Formation shows variations with regularity in the five studied sections, the δ 13 C values all gradually decrease from bottom to top, with a total range from −4.51‰ to 0.11‰, and the biggest negative excursion reaches up to −6.88‰. In addition, abundant macro-body fossils were also found from the Tuerkeng Formation in this study, similar to those found from the Dengying Formation in the South China Block. This observation firmly constrained the age for the Zhengmuguan and Tuerkeng formations to the Sinian period. Here we interpreted that the Zhengmuguan Formation formed during a glacial period when the extremely cold climate substantially decreased the amount of burial of organic matter in the ocean and thus led to the general negative δ 13 C excursion. The increasing δ 13 C values in the Tuerkeng Formation dolomites imply the ending of the glacial period in the Zhengmuguan epoch, biological recovery and increase of organic matter burial in the ocean occurred during this period. Comparing our obtained carbon and oxygen isotopes of the Zhengmuguan and Tuerkeng formations with those of coeval carbonate successions from other places all over the world, the Zhengmuguang-aged glacial deposits might be deposited after the Gaskiers glaciation. This study provides important information for paleo-ocean, paleogeographic and biological evolution in the North China Block during the Ediacaran period and adds new carbon and oxygen isotopes data for the global Sinian carbon-oxygen isotopes dataset. carbon and oxygen isotopes, Sinian carbonate, Helan Mountain, Glacial deposits Citation:Yang J, Zeng Z X, Cai X F, et al. Carbon and oxygen isotopes analyses for the

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Provenance of the Arroyo del Soldado Group (Ediacaran to Cambrian, Uruguay): Implications for the paleogeographic evolution of southwestern Gondwana

Cited by 84 publications

References 65 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

Correlations of some Neoproterozoic carbonate-dominated successions in South America based on high-resolution chemostratigraphy

Carbon and oxygen isotopes analyses for the Sinian carbonates in the Helan Mountain, North China

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