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

Philipp, Ruy Paulo; Pimentel, Márcio Martins; Basei, Miguel Ângelo Stipp

doi:10.1007/978-3-319-68920-3_10

Cited by 32 publications

(14 citation statements)

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“…The geodynamic evolution of the São Gabriel Terrane is controlled by the closure of the Charrua Ocean that took place at 900-700 Ma, represented by outcrops of the mafic-ultramafic ocean floor in the Cerro Mantiqueira Complex (Arena, Hartmann, & Lana, 2016;Leite, Hartmann, McNaugton, & Chemale Jr., 1998;Tommasi et al, 1994), and its passive marginal basin unit in the Arroio Marmeleiro Complex (Philipp et al, 2021;Santos, Maciel, & Zir Filho, 1998). Associated with this ocean closure, arc-related units were formed, including those of this study, namely the Sanga da Cachoeira Complex (Laux, 2017), Imbicuí Complex (Philipp, Pimentel, & Basei, 2018), and the Cambaí Complex (Silva-Filho & Soliani Jr., 1987). Based on studies of fieldwork, petrography, structural geology, and geochemistry, the reconstruction of a tectonic scenario for these rocks has been proposed previously (Chemale Jr., Mallmann, Bitencourt, & Kawashita, 2012;Fernandes et al, 1995a;Philipp et al, 2016;Saalmann et al, 2011), where juvenile magmatism and ophiolitic rocks were generated during the amalgamation of the Río de la Plata and Encantadas-Arachania Microplate, resulting in the São Gabriel Terrane.…”

Section: Introductionmentioning

confidence: 85%

“…F I G U R E 2 Simplified geological map of the Lavras do Sul region, São Gabriel Terrane, showing the main tectonic units. Modified from Kraemer (1995), Laux (2017), Philipp et al (2018), and UFRGS (1991, 2004, 2005. Red triangles are the location of outcrops from which 40 Ar/ 39 Ar samples were collected (i) Santo Afonso Granite-Río de la Plata Craton (Camozzato, Philipp, Laux, Chemale Jr., & Iglesias, 2016); (ii) Caçapava do Sul Granite-São Gabriel Terrane (Bitencourt & Nardi, 2000); (iii) Piquiri Syenite Massif-Tijucas Terrane (Nardi, Plá Cid, Bitencourt, & Stabel, 2008);…”

Section: Rocks Belonging To the Palaeoproterozoic Santa Maria Chicomentioning

confidence: 99%

“…These rocks will be referred to here as the Imbicuí Complex (Philipp et al, 2018), named after the river section along which they are best exposed in Lavras do Sul region. iv.…”

Section: Rocks Belonging To the Palaeoproterozoic Santa Maria Chicomentioning

confidence: 99%

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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: Introductionmentioning

confidence: 85%

Section: Rocks Belonging To the Palaeoproterozoic Santa Maria Chicomentioning

confidence: 99%

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

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“…This displacement must have taken place before the late Ediacaran-Cambrian docking of Arachania, probably during the ca. 720 Ma São Gabriel Orogeny (Philipp et al, 2018).…”

Section: Correlations With South American Units 841 Apiaí Terrane (Ribeira Belt)mentioning

confidence: 99%

The Tapes Complex (Nico Pérez Terrane, Uruguay): Constraining the Mesoproterozoic evolution of the Río de la Plata Craton

Gaucher

Samaniego

Will

et al. 2021

Journal of South American Earth Sciences

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…1). O CMPF é composto por metapelitos, xistos quartzo-feldspáticos, quartzitos e rochas meta-vulcânicas subordinadas (Philipp et al, 2018). Ribeiro et al, (1966) e Bitencourt (1983) definem o CMPF como uma sequência de rochas metavulcânicas e metassedimentares com grau metamórfico crescente desde fácies xisto-verde a anfibolito.…”

Section: Contexto Geológico Regionalunclassified

Modelagem Geológica Implícita em Mina de Mármore no Complexo Metamórfico Passo Feio, Rio Grande do Sul, Brasil

et al. 2020

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

Cited by 32 publications

References 61 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

The Tapes Complex (Nico Pérez Terrane, Uruguay): Constraining the Mesoproterozoic evolution of the Río de la Plata Craton

Modelagem Geológica Implícita em Mina de Mármore no Complexo Metamórfico Passo Feio, Rio Grande do Sul, Brasil

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

Cited by 32 publications

References 61 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

The Tapes Complex (Nico Pérez Terrane, Uruguay): Constraining the Mesoproterozoic evolution of the Río de la Plata Craton

Modelagem Geológica Implícita em Mina de Mármore no Complexo Metamórfico Passo Feio, Rio Grande do Sul, Brasil

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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