Post-collisional subvolcanic rhyolites associated with the Neoproterozoic Pelotas Batholith, southern Brazil

Oliveira, Diego Skieresz de; Sommer, Carlos Augusto; Philipp, Ruy Paulo; Lima, Evandro Fernandes de; Basei, Miguel Ângelo Stipp

doi:10.1016/j.jsames.2015.05.009

Cited by 22 publications

(14 citation statements)

References 58 publications

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“…A U-Pb SHRIMP zircon age of 600 ± 3 Ma was reported for the Santana Granite (Koester et al 2001a). New U-Pb LA-ICP-MS zircon data obtained indicated ages around 550 Ma for the felsic dikes (Oliveira et al 2015).…”

Section: Granitic Suitesmentioning

confidence: 91%

“…According to Oliveira et al (2001), the Itapuã Suite includes granitoids and dike swarms of alkaline affinity that were previously included in the Dom Feliciano Suite. The suite comprises granite, syenogranite, quartz-syenite and subordinate syenite, as well as a dyke swarms of comenditic rhyolite to basalt with alkaline to peralkaline affinity (Oliveira et al 2015). A U-Pb SHRIMP zircon age of 600 ± 3 Ma was reported for the Santana Granite (Koester et al 2001a).…”

Section: Granitic Suitesmentioning

confidence: 97%

“…10) (Philipp & Machado 2005). The granitoids represent an early generation of high-K calc-alkaline suites with metaluminous to peraluminous affinity, followed by alkaline magmatism and, finally, less voluminous peralkaline intrusions (Philipp & Machado 2005, Oliveira et al 2015. Shear zones in the batholith are defined by mylonitic belts with sub-vertical foliation, accompanied by sub-horizontal stretching lineation, and were active during the development of the batholith, controlling the intrusion of the granitic suites (Fig.…”

Section: Pelotas Batholithmentioning

confidence: 99%

“…The overlying Bom Jardim Group is resulted from transpressive tectonics and associated volcanism (Paim et al 2000). The upper section of the Camaquã Basin is a transtensional rift basin developed when amalgamation of the shield was already completed (Oliveira et al 2015). The high-K calc-alkaline plutons have SHRIMP and LA-ICP-MS U-Pb ages between 598 and 570 Ma, whereas the alkaline plutons crystallized between 570 -550 Ma.…”

Section: Camaquã Basinmentioning

confidence: 99%

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Tectonic evolution of the Dom Feliciano Belt in Southern Brazil: Geological relationships and U-Pb geochronology

2016

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ABSTRACT:The Dom Feliciano Belt is an important Neoproterozoic to Cambrian orogenic complex, extending from eastern Uruguay to southern Brazil. It comprises a collage of oceanic domains and continental fragments developed between 900 and 540 Ma between the Rio de La Plata, Congo and Kalahari cratons. The integration of field and structural data with recent isotopic results has introduced new insights on the sources of the magmatism and sedimentary processes. This paper presents a review of the geochronological results combined with stratigraphic, structural and geochemical data. The evolution of the Dom Feliciano Belt involved three orogenic events known as the Passinho (0.89 -0.86 Ga), São Gabriel (0.77 -0.68 Ga) and Dom Feliciano (0.65 -0.54 Ga). The first two events involved the closure of the Charrua Ocean generating an intra-oceanic arc (Passinho) and, subsequently, an active continental margin arc (São Gabriel). This ocean separated the continental areas represented by the Rio de la Plata Craton and the Nico Perez continental microplate. Closure of the Adamastor ocean resulted in an important collisional event between the Nico Perez Microplate/Rio de La Plata Craton and Kalahari and Congo cratons between 650 and 620 Ma, involving high T/intermediate P metamorphism. At this time of crustal thickening, the partition of the deformation controled the final evolution of the belt with important escape tectonics, responsible for nucleating crustal-scale transcurrent shear zones. These structures were deep and promoted the rise of mafic magmas, which, associated with high regional thermal gradient, lead to an important event of crustal reworking, responsible for the formation of the Pelotas Batholith. The orogenic collapse is represented by late magmatism of Pelotas Batholith and deposition of upper section of the Camaquã Basin. KEYWORDS:Rio de La Plata Craton; Nico Perez Microplate; Dom Feliciano Belt; U-Pb Geochronology; Orogeny. RESUMO: O Cinturão Dom Feliciano, que se estende desde o leste do Uruguai até o sul do Brasil, representa um importante orógeno Neoproterozoico formado pela colagem de domínios oceânicos e fragmentos continentais entre os crátons Rio de La Plata, Congo e Kalahari. A integração de dados de mapeamento geológico e estrutural com resultados isotópicos permitu estabelecer uma melhor compreensão sobre as fontes de magmatismo e os processos de sedimentação. A evolução do Cinturão Dom Feliciano envolveu a superposição de três eventos orogênicos denominados

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Section: Granitic Suitesmentioning

confidence: 91%

Section: Granitic Suitesmentioning

confidence: 97%

Section: Pelotas Batholithmentioning

confidence: 99%

Section: Camaquã Basinmentioning

confidence: 99%

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Tectonic evolution of the Dom Feliciano Belt in Southern Brazil: Geological relationships and U-Pb geochronology

2016

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“…High‐silica rhyolitic volcanic and subvolcanic rocks of the Pelotas Batholith are genetically related to a more differentiated granitic suite (Dom Feliciano Suite—550–570 Ma; Fragoso Cesar, ; Oliveira, Sommer, Philipp, Lima, & Basei, ; Philipp et al, ; Philipp, Nardi, & Machado, ; Simon et al, ; Zanon, Machado, & Philipp, ). According to Sommer, Lima, Philipp, Noll Filho, and Oliveira (), these rhyolitic systems are geographically associated with three domains and the Pelotas Batholith, which are typically parallel to NE–SW structures: the south‐west, central, and north‐east domains (Figure ).…”

Section: Introductionmentioning

confidence: 99%

High‐silica Ediacaran volcanism in the Dom Feliciano Belt, southernmost Brazil

et al. 2018

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The Cerro Chato region is located in southernmost Brazil and is characterized by associations of acid volcanic and subvolcanic rocks. The region is affected by NW and NE‐ trending faults and is grouped into 2 geomorphologically distinct features: Cerro Chato and Cerro Partido. Cerro Chato is represented by ignimbrites that occur in 2 main facies: lithic‐rich ignimbrites and crystal‐rich ignimbrites. They are poorly sorted and consist of lapilli‐sized pyroclasts in a tuffaceous matrix with eutaxitic texture. Hemi‐crystalline rhyolitic flows represent effusive events, with porphyritic texture, flow structures, and spherulites. Cerro Partido is characterized by a subvolcanic rhyolitic body, with porphyritic texture, elongated in the NE–SW direction. Through geochemical data, the lithologies were characterized as high‐silica type rhyolites, correlated to the alkaline series, close to the subalkaline series limit; display metaluminous to peraluminous character and high contents of alkalis, FeOt/FeOt + MgO and agpaitic index. The Cerro Partido rhyolites were classified as high‐Ti with higher CaO, P2O5, FeOt, MgO, and K2O contents than the Cerro Chato low‐Ti rhyolites. The REE pattern is slightly enriched in LREE in relation to the HREE and has a strong negative Eu anomaly. U–Pb zircon dating indicates an age of 561 ± 2 Ma for Cerro Partido, suggesting contemporaneity with the granitoids of Dom Feliciano Suite. Additionally, Cerro Chato rhyolites indicate an age of 630.4 ± 2.8 Ma. These ages are in agreement with those obtained in the syn‐sedimentary volcanism at the base of the Maricá Formation, Camaquã Basin.

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The Tectonic Evolution of the São Gabriel Terrane, Dom Feliciano Belt, Southern Brazil: The Closure of the Charrua Ocean

Philipp

Pimentel²,

Basei³

2018

Regional Geology Reviews

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Post-collisional subvolcanic rhyolites associated with the Neoproterozoic Pelotas Batholith, southern Brazil

Cited by 22 publications

References 58 publications

Tectonic evolution of the Dom Feliciano Belt in Southern Brazil: Geological relationships and U-Pb geochronology

Tectonic evolution of the Dom Feliciano Belt in Southern Brazil: Geological relationships and U-Pb geochronology

High‐silica Ediacaran volcanism in the Dom Feliciano Belt, southernmost Brazil

The Tectonic Evolution of the São Gabriel Terrane, Dom Feliciano Belt, Southern Brazil: The Closure of the Charrua Ocean

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