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http://www.repositorio.ufop.br/jspui/handle/123456789/10185
Título: | Evolution of Siderian juvenile crust to Rhyacian high Ba-Sr magmatism in the Mineiro Belt, southern São Francisco Craton. |
Autor(es): | Moreira, Hugo Souza Seixas, Luís Antônio Rosa Storey, Craig Darryl Fowler, Mike Lasalle, Stephanie Stevenson, Ross Lana, Cristiano de Carvalho |
Palavras-chave: | Magmatic lull TTG-sanukitoid transition Zircon U-Pb-Hf Titanite U-Pb Whole rock Nd isotopes |
Data do documento: | 2018 |
Referência: | MOREIRA, H. S. et al. Evolution of Siderian juvenile crust to Rhyacian high Ba-Sr magmatism in the Mineiro Belt, southern São Francisco Craton. Geoscience Frontiers, v. 9, p. 997-995, 2018. Disponível em: <https://www.sciencedirect.com/science/article/pii/S1674987118300458>. Acesso em: 03 mai. 2018. |
Resumo: | Plutonic rocks from the Mineiro Belt, Brazil record a delayed onset of the transition from TTG to sanukitoid-type magmatism (high Ba-Sr), starting during the Siderian magmatic lull when little juvenile magma was added to the continental crust. Rocks mostly belong to the calc-alkaline series, meta- to peraluminous and originally “I-type”, meaning that oxidized magmas were formed by partial melting of subducted material. The temporal distribution and apparent secular changes of the magmas are consistent with the onset of subduction-driven plate tectonics due to an increase of the subduction angle and opening of the mantle wedge. New isotopic analyses (Sm-Nd whole rock and Lu-Hf in zircon) corroborate the restricted juvenile nature of the Mineiro Belt and confirm the genetic link between the Lagoa Dourada Suite, a rare ca. 2350 Ma high-Al tonalite-trondhjemite magmatic event, and the sanukitoid-type ca. 2130 Ma Alto Maranhão Suite. U-Pb dating of zircon and titanite constrain the crystallisation history of plutonic bodies; coupled with major and trace element analyses of the host rocks, they distinguish evolutionary trends in the Mineiro Belt. Several plutons in the region have ages close to 2130 Ma but are distinguished by the lower concentration of compatible elements in the juvenile high Ba-Sr suite. |
URI: | http://www.repositorio.ufop.br/handle/123456789/10185 |
ISSN: | 16749871 |
Licença: | This is an open access article under the CC BY-NCND license. Fonte: o próprio artigo. |
Aparece nas coleções: | DEGEO - Artigos publicados em periódicos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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ARTIGO_EvolutionSiderianJuvenile.pdf | 5,9 MB | Adobe PDF | Visualizar/Abrir |
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