Please use this identifier to cite or link to this item: https://rigeo.cprm.gov.br/handle/doc/505
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dc.contributor.authorSILVA, Luiz Carlos da
dc.contributor.authorNOCE, Carlos Maurício
dc.contributor.authorLOBATO, Lydia Maria
dc.date.accessioned2013-12-19T16:32:32Z
dc.date.available2013-12-19T16:32:32Z
dc.date.issued2000
dc.identifier.citationSILVA, 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.issn0375-7536
dc.identifier.urihttps://rigeo.cprm.gov.br/handle/doc/505
dc.description.abstractThe 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.subjectPETROGRAFIA
dc.subjectTECTÔNICA
dc.subjectVULCANISMO
dc.subjectOROGÊNESE
dc.subjectFÉLSICAS
dc.subjectTTD
dc.subjectBRASIL
dc.subjectMINAS GERAIS
dc.titleDacitic Volcanism in the Course of the Rio das Velhas (2800-2690 Ma) Orogeny: A Brazilian Archean Analogue (TTD) to the Modern Adakites
dc.localSão Paulo
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