Produção Nacional
Revisado por pares
Jardim do Seridó Suite: first example of Ediacaran peraluminous magmatism in the Rio Piranhas-Seridó Domain, Borborema Province, Northeast Brazil
2019; Volume: 2; Issue: 2 Linguagem: Inglês
10.29396/jgsb.2019.v2.n2.3
ISSN2595-1939
AutoresIzaac Cabral Neto, Vladimir Cruz de Medeiros, Rogério Cavalcante, Priscila Rezende Fernandes, Francisco Valdir Silveira, Elton Luiz Dantas, Joseneusa Brilhante Rodrigues, I. Cunha, Vinicius J.C. Paes, Luana Duarte Santos, Ivana C.A. Pinho,
Tópico(s)Paleontology and Stratigraphy of Fossils
ResumoPeraluminous granitoids were recently mapped in the Rio Piranhas-Serido Domain, the northeastportion of the Borborema Province. These bodies occur as stock and intrusive dikes in the metapelites of the Serido Formation, constituting the Jardim do Serido 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 Serido 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 Serido Suite, corroborating the proposed existence of peraluminous magmas associated with the Brasiliano Orogenesis in the Rio Piranhas-Serido Domain. The chemical and petrographic data identified this suite as fertile to that it can generate dikes of rareelements-bearing pegmatites.
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