Nd-Sr-Hf isotopes and U-Pb ages of mesoproterozoic Três Estradas Alkaline-Carbonatite Complex, Brazil: Implications for Sul-Riograndense Shield evolution and rodinia break-up

Monteiro, Cláudio; Oliveira, Ítalo Lopes de; Brod, José Affonso; Dantas, Elton Luiz; Araújo, Cristiane Soares da Silva; Zacchi, Érico Natal Pedro; Fuck, Reinhardt A.

doi:10.1016/j.precamres.2020.105963

Cited by 4 publications

(1 citation statement)

References 82 publications

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“…Granulitic Complex interpreted as a 2.4 Ga magmatic arc (Girelli et al, 2018;Nardi & Hartmann, 1979) make up the majority of the Río de la Plata Craton. Subordinately in the craton, Mesoproterozoic rocks (Três Estradas Carbonatite Complex;Monteiro et al, 2020) and several Neoproterozoic units occur (Laux, 2017). The remaining units of the Sul-rio-grandense Shield belong to the Neoproterozoic DFB, which is separated from the cratonic area by the geophysical discontinuity known as the Ibaré Lineament or São Gabriel Suture (Fernandes et al, 1995b;Hartmann et al, 2016).…”

Section: Rocks Belonging To the Palaeoproterozoic Santa Maria Chicomentioning

confidence: 99%

Tonian and Cryogenian ⁴⁰Ar/³⁹Ar hornblende and muscovite ages for the São Gabriel Terrane, Dom Feliciano Belt, southern Brazil

et al. 2021

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Belt, Brazil, associated with previous structural geology and geochronology studies, allow for a better understanding of Neoproterozoic events in this region. The Sanga da Cachoeira Complex and metasedimentary rocks of Arroio Marmeleiro Complex (U-Pb provenance age > 1.5 Ga) show 40 Ar/ 39 Ar spectra with no successful plateau age, attributed to the alteration or excess 40 Ar. Tonian (ca. 729 ± 9 Ma) 40 Ar/ 39 Ar hornblende age of metadiorites of the Cambaí Complex (U-Pb protolith age ca. 750 Ma) is interpreted to register the age of an early structure in this unit, where hornblende is a mineral of the composite banding fabric formed by remnants of original bedding, locally preserved, and added by metamorphic recrystallization. A cooling rate of at least 5 C/Ma is suggested for the Cambaí Complex, from its crystallization to its metamorphic event. The Cryogenian (<690 ± 8 Ma) 40 Ar/ 39 Ar hornblende and muscovite ages belonging to the Imbicuí Complex (protolith age ca. 869 Ma) whose ages are related to the late structure formed by a short and intense activity of the Cerro Branco Shear Zone, which experienced a rapid cooling of 12 C/Ma. The ages from the rocks belonging to such a diverse tectonic setting, including continental and intraoceanic island arc, oceanic crust low-K amphibolites and meta-harzburgites, and metasediments, presenting similar nature and fabric orientation, indicate that major tectonic-magmatic-metamorphic activity was responsible for the accretion of these lithotectonic units that gave rise to the São Gabriel Terrane in southern Brazil.

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Section: Rocks Belonging To the Palaeoproterozoic Santa Maria Chicomentioning

confidence: 99%

Tonian and Cryogenian ⁴⁰Ar/³⁹Ar hornblende and muscovite ages for the São Gabriel Terrane, Dom Feliciano Belt, southern Brazil

et al. 2021

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Mesozoic to Cenozoic alkaline and tholeiitic magmatism related to West Gondwana break-up and dispersal

2022

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Paleoproterozoic metagabbro xenolith in the southeastern Dom Feliciano Belt, southern Brazil: A new piece in the West Gondwana assembly

Koester

Porcher²,

Ramos³

et al. 2022

Journal of South American Earth Sciences

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Nd-Sr-Hf isotopes and U-Pb ages of mesoproterozoic Três Estradas Alkaline-Carbonatite Complex, Brazil: Implications for Sul-Riograndense Shield evolution and rodinia break-up

Cited by 4 publications

References 82 publications

Tonian and Cryogenian ⁴⁰Ar/³⁹Ar hornblende and muscovite ages for the São Gabriel Terrane, Dom Feliciano Belt, southern Brazil

Tonian and Cryogenian ⁴⁰Ar/³⁹Ar hornblende and muscovite ages for the São Gabriel Terrane, Dom Feliciano Belt, southern Brazil

Mesozoic to Cenozoic alkaline and tholeiitic magmatism related to West Gondwana break-up and dispersal

Paleoproterozoic metagabbro xenolith in the southeastern Dom Feliciano Belt, southern Brazil: A new piece in the West Gondwana assembly

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Nd-Sr-Hf isotopes and U-Pb ages of mesoproterozoic Três Estradas Alkaline-Carbonatite Complex, Brazil: Implications for Sul-Riograndense Shield evolution and rodinia break-up

Cited by 4 publications

References 82 publications

Tonian and Cryogenian 40Ar/39Ar hornblende and muscovite ages for the São Gabriel Terrane, Dom Feliciano Belt, southern Brazil

Tonian and Cryogenian 40Ar/39Ar hornblende and muscovite ages for the São Gabriel Terrane, Dom Feliciano Belt, southern Brazil

Mesozoic to Cenozoic alkaline and tholeiitic magmatism related to West Gondwana break-up and dispersal

Paleoproterozoic metagabbro xenolith in the southeastern Dom Feliciano Belt, southern Brazil: A new piece in the West Gondwana assembly

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Tonian and Cryogenian ⁴⁰Ar/³⁹Ar hornblende and muscovite ages for the São Gabriel Terrane, Dom Feliciano Belt, southern Brazil

Tonian and Cryogenian ⁴⁰Ar/³⁹Ar hornblende and muscovite ages for the São Gabriel Terrane, Dom Feliciano Belt, southern Brazil