The Barreiro suite in the central Ribeira Belt (SE-Brazil) : a late tonian tholeiitic intraplate magmatic event in the distal passive margin of the São Francisco Paleocontinent
Saved in:
| Main Author: | |
|---|---|
| Publication Date: | 2019 |
| Other Authors: | , , , , , , , , |
| Format: | Article |
| Language: | eng |
| Source: | Repositório Institucional da UnB |
| Download full: | https://repositorio.unb.br/handle/10482/36682 https://doi.org/10.1590/2317-4889201920180129 http://orcid.org/0000-0002-3521-9251 http://orcid.org/0000-0001-8005-0646 http://orcid.org/0000-0002-2733-7813 http://orcid.org/0000-0002-9341-2615 http://orcid.org/0000-0002-5205-5359 http://orcid.org/0000-0002-7954-5059 http://orcid.org/0000-0002-4025-2283 http://orcid.org/0000-0003-3863-6576 http://orcid.org/0000-0003-1391-0268 http://orcid.org/0000-0002-0546-7772 |
Summary: | New geochemical, U-Pb, Lu-Hf and Sr-Nd data from the Barreiro Suite metabasites in comparison with enclaves within the distal Andrelândia Group and the orthogranulites of the Juiz de Fora Complex are presented. Geochemical data suggest intraplate setting, with high and low-TiO 2 , TDM Nd ages between 1.80 and 1.41 Ga, negative ΕNd t and ( 87 Sr/ 86 Sr)i between 0.714 and 0.747. Results contrast with part of the Juiz de Fora Complex enclaves, with island arc tholeiites- calcalkaline basalts (IAT-CAB) geochemical signatures, TDM Nd ages between 2.58 and 2.16 Ga, positive ΕNd t values and (87Sr/86Sr) i between 0.700 and 0.712. U-Pb data for the Barreiro Suite yielded a crystallization age of 766 ± 13 Ma and a metamorphic overprint of 619 ± 6 Ma. The results indicate three episodes of mafic magmatism in the Occidental terrane of the Ribeira Belt. The two older episodes are related to Rhyacian arc evolution (ca. 2.2 to 2.1 Ga) and to the Statherian (ca. 1.7 Ga) tectonics, and occur only within the Juiz de Fora Complex, while the younger ca. 766 Ma episode constrains the timing of distal passive margin evolution. An important implication is that these late Tonian metabasic rocks could have been a source of detrital zircons for the sedimentation along the distal Andrelândia basin. |
Similar Items: The Barreiro suite in the central Ribeira Belt (SE-Brazil) : a late tonian tholeiitic intraplate magmatic event in the distal passive margin of the São Francisco Paleocontinent
- Isótopos de Nd aplicados à datação direta de formações ferríferas paleoarqueanas do maciço São José do Campestre, Rio Grande do Norte-RN
- High spatial resolution analysis of Pb and U isotopes for geochronology by laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS)
- A Problemática da normatividade : convergências e dissonâncias entre Michel Foucault e Georges Canguilhem
- Marcadores isotópicos da origem da pesca do pirarucu na bacia Amazônica, Brasil
- Mineralogia de produtos de interação entre magma basáltico e sedimentos no Grupo São Bento, região de Goiatuba, GO
- A metodologia 238U-234U-230Th aplicada à conchas de Anomalocardia brasiliensis do sítio Cubatão I, em Joinville, Santa Catarina, SC