Jardim do Seridó Suite: first example of Ediacaran peraluminous magmatism in the Rio Piranhas-Seridó Domain, Borborema Province, Northeast Brazil

Journal of the Geological Survey of Brazil

Endereço:
SBN Quadra 2 Bloco H - 1° andar - Asa Norte
Brasília / DF
70040-904
Site: https://jgsb.cprm.gov.br/index.php/journal/index
Telefone: (61) 2108-8400
ISSN: 2595-1939
Editor Chefe: Evandro Luiz Klein
Início Publicação: 15/05/2018
Periodicidade: Quadrimestral
Área de Estudo: Multidisciplinar, Área de Estudo: Multidisciplinar

Jardim do Seridó Suite: first example of Ediacaran peraluminous magmatism in the Rio Piranhas-Seridó Domain, Borborema Province, Northeast Brazil

Ano: 2019 | Volume: 2 | Número: 2
Autores: Izaac Cabral Neto, Vladimir Cruz de Medeiros, Rogério Cavalcante, Priscila Rezende Fernandes, Francisco Valdir Silveira, Elton Luiz Dantas, Joseneusa Brilhante Rodrigues, Ioná Cunha, Vinicius Jose de Castro Paes, Luana Duarte Santos, Ivana Conceição Araújo Pinho.
Autor Correspondente: Izaac Cabral Neto | [email protected]

Palavras-chave: Peraluminous magmatism, two-mica granite, Rio Piranhas-Seridó Domain, Borborema Province, Ediacaran.

Resumos Cadastrados

Resumo Inglês:

Peraluminous granitoids were recently mapped in the Rio Piranhas-Seridó Domain, the northeastportion of the Borborema Province. These bodies occur as stock and intrusive dikes in the metapelites of the Seridó Formation, constituting the Jardim do Seridó Suite. This suite has two facies. The first and most expressive facies consists of a medium-grained and whitish leucocratic monzogranite with muscovite, garnet, and biotite, while the second is represented by fine-grained and greyish leucocratic granodiorites with biotite, cropping out mainly on the edges of the main body. The thermobarometric conditions for the crystallization of the monzogranites were estimated between 2-5 kbar and 690-950 ºC, whereas the lithochemical data indicate a syn-collisional peraluminous signature. Neoproterozoic garnet-biotite schist xenoliths of the Seridó Formation are sometimes observed partially assimilated in the main body (stock). A U-Pb zircon age of 592 ± 2 Ma obtained in the main body is considered as the crystallization age of the Jardim do Seridó Suite, corroborating the proposed existence of peraluminous magmas associated with the Brasiliano Orogenesis in the Rio Piranhas-Seridó Domain. The chemical and petrographic data identified this suite as fertile to that it can generate dikes of rare elements-bearing pegmatites.