Tectonic setting of basic igneous and metaigneous rocks of Borborema Province, Brazil using multi-dimensional geochemical discrimination diagrams

Autor(es)

Verma, Sanjeet K. ; Oliveira, Elson P.

• Tipo de documento: Artigo Científico
• Fonte: Journal of South American Earth Sciences; v. 58, p. 9-pg., 2015-03-01.

Resumo

Fifteen multi-dimensional diagrams for basic and ultrabasic rocks, based on log-ratio transformations, were used to infer tectonic setting for eight case studies of Borborema Province, NE Brazil. The applications of these diagrams indicated the following results: (1) a mid-ocean ridge setting for Forquilha eclogites (Central Ceara domain) during the Mesoproterozoic; (2) an oceanic plateau setting for Algodoes amphibolites (Central Ceara domain) during the Paleoproterozoic; (3) an island arc setting for Brejo Seco amphibolites (Riacho do Pontal belt) during the Proterozoic; (4) an island arc to mid-ocean ridge setting for greenschists of the Monte Orebe Complex (Riacho do Pontal belt) during the Neoproterozoic; (5) within-plate (continental) setting for Vaza Bards domain mafic rocks (Sergipano belt) during the Neoproterozoic; (6) a less precise arc to continental rift for the Gentileza unit metadiorite/gabbro (Sergipano belt) during the Neoproterozoic; (7) an island arc setting for the Novo Gosto unit metabasalts (Sergipano belt) during Neoproterozoic; (8) continental rift setting for Rio Grande do Norte basic rocks during Miocene. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/07243-3 - Novos diagramas de discriminação multi-dimensionais e modelagem geoquímica aplicados a rochas ígneas arqueanas de cratons brasileiros
• Beneficiário: Sanjeet Kumar Verma
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/15824-6 - Evolução de terrenos arqueanos do Cráton São Francisco e Província Borborema: implicações para processos geodinâmicos e paleoambientais globais
• Beneficiário: Elson Paiva de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Temático