The Dom Feliciano Belt in Southern Brazil and Uruguay

Hueck, Mathias; Oyhantçabal, Pedro; Philipp, Ruy Paulo; Basei, Miguel Ângelo Stipp; Siegesmund, Siegfried

doi:10.1007/978-3-319-68920-3_11

Cited by 62 publications

(35 citation statements)

References 135 publications

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“…The southernmost of these orogens is the Dom Feliciano Belt (DFB), stretching from Uruguay to south Brazil for over 1,100 km. It was formed by the tectonic interaction of the Río de la Plata, Congo, and Kalahari cratons, together with several microplates, juxtaposed along major shear zones (Basei et al, ; Hueck et al, ; Oriolo et al, ; Oyhantçabal et al, ; Philipp et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…Geological map of the Major Gercino Shear Zone, with location of the analyzed samples (modified from Basei et al, , ; Hueck et al, ; Passarelli et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…All three domains were juxtaposed in the Neoproterozoic during the assembly of the orogenic belt. Regional metamorphism was accompanied by reworking of the basement inliers in a converging setting between 650 and 620 Ma (Basei, Campos Neto, et al, , Basei et al, ; Chemale et al, ; Hueck et al, ; Philipp et al, ). Most transcurrence within the MGSZ took place between 615 and 585 Ma, coupled to intense granitic magmatism in all domains that extended until ~570 Ma (Florisbal et al, ; Hueck et al, ; Passarelli et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…First, initial cooling from middle‐temperature range (e.g., cooling temperatures of K‐Ar system in muscovite) in the region happened between 600 and 500 Ma. Most dated samples are granites dated by U‐Pb predominantly between 625 and 570 Ma (Basei, Campos Neto, et al, ; Chemale et al, ; Florisbal et al, ; Hueck et al, ; Passarelli et al, ), and mica K‐Ar ages spread from 600 to 540 Ma (Passarelli et al, ). Second, deposition of Devonian and Permian sediments of the Paraná Basin may have covered the studied area.…”

Section: Modeling the Thermal Historymentioning

confidence: 99%

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(U‐Th)/He Thermochronology and Zircon Radiation Damage in the South American Passive Margin: Thermal Overprint of the Paraná LIP?

et al. 2018

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New zircon and apatite (U-Th)/He data (AHe and ZHe) from the crystalline basement of the South American passive margin in southern Brazil present a wide distribution of Phanerozoic apparent ages, recording its prerift evolution. Its geological significance can be investigated by modeling the influence of the accumulated radiation damages on the measured crystals in its He ages during a long upper crust residence. Despite the presence of a significant fault in the studied area, the samples essentially constrain a uniform thermal history for the entire study area. Zircon helium ages spread from 472 to 26 Ma and correlate strongly with the radioactive element content of the crystals. Although the region was probably covered by Paleozoic sediments of the Paraná Basin, the ZHe system experienced a more intense thermal overprint, most likely the onset of the Paraná Large Igneous Province (LIP), causing its dispersion. The nearby intrusion of a feeding system of the LIP, the Florianópolis Dyke Swarm, may have contributed for keeping geothermal gradients elevated for a period long enough to promote the observed reset. After the extrusion of the volcanism, the study area was probably covered by up to 2 km of basalt floods, imprinting temperatures above the AHe partial retention zone on the crystalline basement. These were eroded during rapid cooling between 75 and 55 Ma, as indicated by thermal modeling. Additional analyses with Raman spectroscopy were used for calculating radiation damage ages in the zircon crystals measured for (U-Th)/He, resulting in a comparable set of ages.

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Section: Geological Settingmentioning

confidence: 99%

“…Geological map of the Major Gercino Shear Zone, with location of the analyzed samples (modified from Basei et al, , ; Hueck et al, ; Passarelli et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Modeling the Thermal Historymentioning

confidence: 99%

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(U‐Th)/He Thermochronology and Zircon Radiation Damage in the South American Passive Margin: Thermal Overprint of the Paraná LIP?

et al. 2018

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“…No setor sul da porção brasileira do Cinturão Dom Feliciano, no Escudo Sul-rio-grandense, são encontradas extensas áreas graníticas neoproterozoicas associadas ao Terreno Cuchilla Dionisio-Pelotas, um dos terrenos relacionados à amalgamação do paleocontinente Gondwana Ocidental durante os estágios intermediários e finais do ciclo orogênico Brasiliano-Pan-africano (e.g., Bossi & Gaucher, 2004;Silva et al, 2005a;Hueck et al, 2018). Esse terreno é constituído por batólitos multi-intrusivos e polifásicos, agrupados em suítes intrusivas com características petrográficas, geoquímicas e geocronológicas em comum (e.g., Fragoso-César et al, 1986;Philipp, 1998;Hueck et al, 2018). Nas suítes intrusivas mais antigas, como a denominada Pinheiro Machado (Philipp, 1998), é comum a presença de xenólitos e roof pendants metamórficos para-e ortoderivados centimétricos a decamétricos, os quais representam crosta continental e oceânica pretérita (e.g., Philipp & Machado, 2002;Vieira et al, 2019).…”

Section: Introductionunclassified

Petrologia de nova ocorrência dos Anfibolitos Alto Alegre, SE do Cinturão Dom Feliciano, Brasil

2020

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Na região de Herval, extremo sul do setor brasileiro do Cinturão Dom Feliciano, foram encontradas novas ocorrências dos Anfibolitos Alto Alegre. Esses anfibolitos ocorrem como xenólitos em granitoides de ca. 630-610 Ma da suíte intrusiva Pinheiro Machado, que são as rochas predominantes na região. O presente artigo apresenta um estudo integrado de petrografia (microscopia óptica) e geoquímica de rocha total (elementos maiores, traços e ETR) e isotópica (Sr-Nd), em uma amostra representativa dos Anfibolitos Alto Alegre, com o objetivo de aprofundar o entendimento sobre esta unidade e sua petrogênese. A amostra apresenta mineralogia constituída por hornblenda (± 60 %), plagioclásio (± 20 %), biotita (± 10 %), epidoto (± 5 %), quartzo (< 5 %) e, subordinadamente, titanita, clorita, rutilo, pirita e apatita. A textura principal é a granoblástica poligonal, marcada por hornblenda + plagioclásio, indicando equilíbrio metamórfico em ca. 600ºC e pico metamórfico em condições de fácies anfibolito. A geoquímica de rocha total sugere um protólito gabroico oceânico. Razões de elementos traços e ETR sugerem um ambiente de suprassubducção, transicional entre MORB e IAB, cuja fonte mantélica foi contaminada por componentes crustais. A assinatura isotópica Sr-Nd fortalece essa hipótese (87Sr/86Sr(t) = 0,707; 147Sm/144Nd = 0,118; ɛNd(t) = -7,5). A partir dos resultados e da comparação com metamafitos oceânicos da região, sugere-se que os Anfibolitos Alto Alegre poderiam representar relictos do paleo-oceano Adamastor Sul, relacionado ao paleocontinente Gondwana Ocidental.

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Capão do Leão Granite: Highly differentiated garnet‐bearing magmatism in the southeastern Dom Feliciano Belt, Brazil

et al. 2020

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The Capão do Leão Granite (CLG; 583 ± 3 Ma) occurs as two NE‐oriented bodies, near the namesake city and Pedro Osório, Rio Grande do Sul, Brazil. The CLG is linked to the voluminous Ediacaran magmatism in the SE Dom Feliciano Belt (Pelotas Batholith), intruded in post‐collisional settings in the set of the non‐deformed younger plutons in the area. This work presents field characterization, petrography, mineral chemistry and whole‐rock geochemical affinities for the CLG. This granite exhibits miarolitic cavities, suggesting an epizonal emplacement, as well as mafic enclaves, which may represent source material, while mylonitic and S–C foliations are localized and post‐magmatic. The analysed samples are massive, leucocratic, coarse‐ to medium‐grained hypidiomorphic alkali‐feldspar granites composed of quartz, orthoclase (Or89–98), albite (An1–10), oligoclase (An11–16), garnet (Sps31–64 and Alm24–56), siderophyllite/annite, muscovite and Fe‐chlorite (secondary), apatite, epidote/zoisite, zircon, and opaques. The dispersion in mineral compositions in each occurrence and between them suggest different magmatic evolutionary trends. The diverse textures, zoning patterns and chemistry in garnet indicate both equilibrium with highly evolved Al2O3‐rich liquids, as well as a xenocrystic/restitic origin. The geochemistry shows subalkaline, high‐K, and metaluminous to weakly peraluminous fingerprints. Samples are commonly enriched in Rb, Th, U, Pb, Nd, and Sm, and depleted in Ba, Sr, Eu, Nb, P, Zr and Ti, due to advanced fractional crystallization. The classification of the CLG into some traditional chemical patterns is difficult, due to the high differentiation and the overlap of petrologic processes, although its derivation from I‐type liquids is proposed. The dispersion both in mineral and whole‐rock chemistry indicates different evolutionary trends for the CLG, where fractionation coupled with crustal recycling by assimilation/contamination processes were responsible for the granite differentiation.

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The Dom Feliciano Belt in Southern Brazil and Uruguay

Cited by 62 publications

References 135 publications

(U‐Th)/He Thermochronology and Zircon Radiation Damage in the South American Passive Margin: Thermal Overprint of the Paraná LIP?

(U‐Th)/He Thermochronology and Zircon Radiation Damage in the South American Passive Margin: Thermal Overprint of the Paraná LIP?

Petrologia de nova ocorrência dos Anfibolitos Alto Alegre, SE do Cinturão Dom Feliciano, Brasil

Capão do Leão Granite: Highly differentiated garnet‐bearing magmatism in the southeastern Dom Feliciano Belt, Brazil

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