Provenance of the Neoproterozoic Maricá Formation (Sul-rio-grandense Shield, Southern Brazil): Petrographic and Sm–Nd isotopic constraints

Borba, André Weissheimer de; Mizusaki, Ana Maria Pimentel; Silva, Diogo Rodrigues Andrade da; Koester, Edinei; Noronha, Fábio de Lima; Casagrande, Junia

doi:10.1016/j.gr.2006.01.005

Cited by 22 publications

(23 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The dominance of the Hilário Formation in the catchment area Gastal et al (2003), Wildner et al (2002), Babinski et al (1996), Chemale (2000) and Borba et al (2006); (B) samples from northern region and Pedra do Segredo section; shaded fields are based on source rock data presented by Almeida et al (2003), Wildner et al (2002) and Babinski et al (1996). of these basal alluvial deposits is confirmed by the T DM model age (1.24 Ga), very similar to the data obtained on a trachyte clast (1.28 Ga).…”

Section: Discussionmentioning

confidence: 99%

“…Paleoproterozoic. Possible interpretations account for the activation of source areas located further southwestward, such as in the Paleoproterozoic Taquarembó Domain (Soliani et al, 2000), or a more significant contribution of the recycling of Paleoproterozoic-sourced sedimentary units, such as the Maricá Formation (Borba et al, 2006).…”

Section: Southern Regionmentioning

confidence: 99%

“…The lowermost Maricá Formation (Leinz et al, 1941) is composed of three distinct sedimentary successions, two of fluvial origin (lower and upper successions) and one marine package (intermediate succession), with dominant granite-gneiss provenance (''uplift basement" provenance) and increasing volcanic contribution (''dissected arc") towards the top (Borba et al, 2004). Sm-Nd data performed in sandstones and fine-grained rocks suggest a uniform Paleoproterozoic provenance [T DM between 1.76 and 2.37 Ga and strongly negative e Nd (t) parameter, around À14] for the Maricá Formation (Borba et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Santa Bárbara Formation (Early Paleozoic, Caçapava do Sul, southern Brazil): Petrographic and Sm–Nd isotopic provenance parameters

Borba

Mizusaki

Maraschin

et al. 2008

Journal of South American Earth Sciences

Self Cite

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Section: Southern Regionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Santa Bárbara Formation (Early Paleozoic, Caçapava do Sul, southern Brazil): Petrographic and Sm–Nd isotopic provenance parameters

Borba

Mizusaki

Maraschin

et al. 2008

Journal of South American Earth Sciences

Self Cite

View full text Add to dashboard Cite

“…The Maricá Group is interpreted to be formed as retro-arc foreland basin due collision of the Rio de la Plata and Encantadas microcontinent (Borba et al 2006(Borba et al , 2008. The overlying Bom Jardim Group is resulted from transpressive tectonics and associated volcanism (Paim et al 2000).…”

Section: Camaquã Basinmentioning

confidence: 99%

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

2016

View full text Add to dashboard Cite

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

show abstract

“…O segundo objetivo é apresentar o procedimento experimental do método Sm-Nd utilizado no laboratório de Geologia Isotópica da UFPA (Pará-Iso), o qual foi desenvolvido por Kelley (1982) e Hayward (1983) e descrito em (Moura 1992). Esse procedimento difere daquele utilizado nos outros laboratórios de geocronologia no Brasil, como no Laboratório de Geocronologia (Universidade de Brasília) (Gioia & Pimentel 2000), Laboratório de Geocronologia (Universidade de São Paulo) (Sato et al 1995) e Laboratório de Geologia Isotópica (Universidade Federal do Rio Grande do Sul) (Borba et al 2006). Em uma primeira parte, será portanto apresentada uma descrição detalhada do procedimento experimental de análise Sm e Nd e, em seguida, serão apresentados resultados isotópicos Sm-Nd obtidos no laboratório Pará-Iso e no de Geocronologia da UnB, em rocha total (RT) e granada de granu-litos félsicos de Tartarugal Grande, na região central do Amapá, borda norte do Bloco Arqueano Amapá.…”

unclassified

Datação Sm-Nd em rocha total e granada do metamorfismo granulítico da região de Tartarugal Grande, Amapá Central

Oliveira

Lafon

Gioia

et al. 2008

RBG

View full text Add to dashboard Cite

Provenance of the Neoproterozoic Maricá Formation (Sul-rio-grandense Shield, Southern Brazil): Petrographic and Sm–Nd isotopic constraints

Cited by 22 publications

References 33 publications

Santa Bárbara Formation (Early Paleozoic, Caçapava do Sul, southern Brazil): Petrographic and Sm–Nd isotopic provenance parameters

Santa Bárbara Formation (Early Paleozoic, Caçapava do Sul, southern Brazil): Petrographic and Sm–Nd isotopic provenance parameters

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

Datação Sm-Nd em rocha total e granada do metamorfismo granulítico da região de Tartarugal Grande, Amapá Central

Contact Info

Product

Resources

About