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Campo DC | Valor | Idioma |
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dc.contributor.author | SILVA, Luiz Carlos da | |
dc.contributor.author | NOCE, Carlos Maurício | |
dc.contributor.author | LOBATO, Lydia Maria | |
dc.date.accessioned | 2013-12-19T16:32:32Z | |
dc.date.available | 2013-12-19T16:32:32Z | |
dc.date.issued | 2000 | |
dc.identifier.citation | SILVA, Luiz Carlos da; NOCE, Carlos Maurício; LOBATO, Lydia Maria. Dacitic Volcanism in the Course of the Rio das Velhas (2800-2690 Ma) Orogeny: A Brazilian Archean Analogue (TTD) to the Modern Adakites. Revista Brasileira de Geociências, São Paulo, v.30, n.3, p.384-387, São Paulo. | |
dc.identifier.issn | 0375-7536 | |
dc.identifier.uri | https://rigeo.sgb.gov.br/handle/doc/505 | |
dc.description.abstract | The evolution of the Rio das Velhas Greenstone Belt followed two main episodes of crustal addition. An initial phase of ocean- floor spreading is associated with tholeiitic to komatiitic magmatism. This early accreted, short-lived oceanic crust underwent rapid subduction, giving rise to widespread arc-related, felsic calc-alkaline volcanism, triggered by the direct melting of the oceanic slab. The felsic rocks comprise lavas and pyroclastic facies, extruded at ca. 2775 Ma and rapidly dispersed through syn- and post-eruptive submarine resedimentation processes. The sequence is coeval with a series of granitoids intrusive into the belt margins, characterizing a tonalite-trondhjemite-dacite (TTD) magmatism. The LILE depleted, Na-rich, chemical signature shown by the volcanic rocks fits well with a genetic model which incorporates aspects of the evolution of adakites in the modern Circum-Pacific arcs, and also the ancient FI dacites from the Barberton Greenstone Belt. | |
dc.language | en | |
dc.subject | PETROGRAFIA | |
dc.subject | TECTÔNICA | |
dc.subject | VULCANISMO | |
dc.subject | OROGÊNESE | |
dc.subject | FÉLSICAS | |
dc.subject | TTD | |
dc.subject | BRASIL | |
dc.subject | MINAS GERAIS | |
dc.title | Dacitic Volcanism in the Course of the Rio das Velhas (2800-2690 Ma) Orogeny: A Brazilian Archean Analogue (TTD) to the Modern Adakites | |
dc.type | Article | - |
dc.local | São Paulo | |
Aparece nas coleções: | Artigos de Periódicos |
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