SHRIMP U-Pb age and high temperature conditions of the collisional metamorphism in the Várzea do Capivarita Complex: Implications for the origin of Pelotas Batholith, Dom Feliciano Belt, southern Brazil

Philipp, Ruy Paulo; Bom, Francisco Molina; Pimentel, Márcio Martins; Junges, Sérgio Luiz; Zvirtes, Gustavo

doi:10.1016/j.jsames.2015.11.008

Cited by 37 publications

(39 citation statements)

References 39 publications

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“…The oldest unit of the batholith is the Quitéria Granite, followed by the Cordilheira Suite, Pinheiro Machado Complex, and the Viamão, Erval, Piquiri, Encruzilhada do Sul, Dom Feliciano and the Itapuã suites (Koester et al 2001a,b, Frantz et al 2003, Philipp et al 2002 Sr initial ratios and negative ε Nd values. The Sm-Nd (T DM ) model ages are in the interval between 1.100 and 2.100 Ma, supporting, therefore, origin of the granitic melts by anatexis of older crustal rocks (Koester et al 2001b, Philipp et al 2003, 2016a.…”

Section: Pelotas Batholithmentioning

confidence: 62%

“…New LA-ICP-MS U-Pb zircon ages of peraluminous leucogranite in migmatitic pelitic gneiss of the Varzea do Capivarita Complex indicate crystallization at 620 ± 6 Ma, whereas metamorphic zircon grains of the migmatitic gneisses have the age of 619 ± 5 Ma. This indicates that the granitic magmatism of the Quitéria region represents the early stages of formation of the Pelotas Batholith (Philipp et al , 2016a.…”

Section: Granitic Suitesmentioning

confidence: 86%

“…650 and 620 Ma (eg. : Fernandes et al 1992, Chemale et al 1995, Basei et al 2011, Bitencourt & Nardi 2000, Philipp & Machado 2005, Saalmann et al 2005, 2010, 2016a, 2000, Chemale Jr. et al 2012. Remnants of older continental crust are represented by septa exposed in Santa Catarina , Basei et al 2008, Rio Grande do Sul (Philipp & Machado, 2005, Philipp et al 2008, and Uruguay (Hartmann et al 2002, Oyhantçabal et al 2011.…”

Section: Geotectonic Contextmentioning

confidence: 99%

“…Basement inliers are represented by low to high grade metamorphic rocks, which occur in large areas in the northern portion of the batholith and as xenoliths of centimetric to decametric dimensions in the central and southern areas. The main exposures are within granites of the Encruzilhada do Sul Suite, and are xenoliths of paragneisses of the Várzea do Capivarita Complex (VCC) and orthogneisses of the Arroio dos Ratos Complex (ARC) (Fernandes et al 1992, Philipp et al 2016a). In the same region, in the northern part of the Pelotas Batholith, is the Capivarita Anorthosite (CA) (Chemale et al 2011).…”

Section: Basement Inliers and Xenolithsmentioning

confidence: 99%

“…Rocks of both complexes were metamorphosed under medium to high grade metamorphic conditions (Lima et al 1998, Gross et al 2006. In this area, the Capivarita Anorthosite and other Paleoproterozoic basement rocks record the collisional metamorphism under upper amphibolite to granulite facies conditions (Fernandes et al 1992, Chemale Jr. et al 2011, Philipp et al 2016a. The magmatic ages of orthogneisses of the ARC are ca.…”

Section: Basement Inliers and Xenolithsmentioning

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: Pelotas Batholithmentioning

confidence: 62%

Section: Granitic Suitesmentioning

confidence: 86%

Section: Geotectonic Contextmentioning

confidence: 99%

Section: Basement Inliers and Xenolithsmentioning

confidence: 99%

Section: Basement Inliers and Xenolithsmentioning

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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Contribution to the understanding of the Pinheiro Machado Complex (Dom Feliciano Belt, Brazil): A study of textures, mineral chemistry, and crystallization conditions

et al. 2020

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This article presents textures, mineral chemistry, and geothermobarometric data for the southeastern Pinheiro Machado Complex rocks (PMC), eastern domain of the Dom Feliciano Belt, Rio Grande do Sul, Brazil. The PMC is composed by comagmatic intrusions of quartz diorite, tonalite, and granodiorite with medium‐ to fine‐grained equigranular and medium‐grained inequigranular textures with subordinate alkali‐feldspar macrocrystals. Partial melting features are observed in the comagmatic as melt pools and melt films. Amphibolite xenoliths also occur, presenting sharp‐angled to rounded contacts with the intrusions and evidences of partial assimilation, marked by mafic schlierens. Electron probe microanalyzer punctual analyses were used to classify amphibole, plagioclase, biotite, epidote, and titanite, as well as for the calculations of the crystallization P–T conditions. Amphiboles consist of pargasite for the comagmatic intrusions, and Mg‐hornblende for the amphibolite. Plagioclase ranges from oligoclase to andesine (An15‐40) in both units. Biotite corresponds to annite, with Fe/(Fe + Mg) > 0.3. The epidote has mostly magmatic characteristics in the comagmatic intrusions, with pistacite content 25–30%. Titanite has two distinct textures, titanite I is well formed, subhedral to euhedral, with up to 3 mm; while titanite II is anhedral with size >1 mm and rounded shapes, being both chemically homogeneous. The estimated P–T conditions for the amphibolite crystallization, using plagioclase‐hornblende geothermometer are 650–850°C and 3.62–4.95 kbar, whereas the conditions from the comagmatic intrusions are 714–871°C and 4.44–6.10 kbar. In the mineral phases there is a prevalence in the recrystallization field between subgrain rotation (SGR) and grain boundary migration (GBM) in submagmatic flow. These new data indicate that possibly at the end of PMC crystallization, late magmatic fluids caused re‐equilibrium of mineral phases, mainly in biotite and feldspars. Finally, we suggest that the PMC is the result of continuous and repeated comagmatic intrusions in a continental magmatic arc setting at a depth of 20–30 km in an amphibolitic continental crust.

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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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SHRIMP U-Pb age and high temperature conditions of the collisional metamorphism in the Várzea do Capivarita Complex: Implications for the origin of Pelotas Batholith, Dom Feliciano Belt, southern Brazil

Cited by 37 publications

References 39 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

Contribution to the understanding of the Pinheiro Machado Complex (Dom Feliciano Belt, Brazil): A study of textures, mineral chemistry, and crystallization conditions

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

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