Busca avançada
Ano de início
Entree


Application of 55 multi-dimensional tectonomagmatic discrimination diagrams to Precambrian belts

Texto completo
Autor(es):
Verma, Surendra P. ; Verma, Sanjeet K. ; Oliveira, Elson P.
Número total de Autores: 3
Tipo de documento: Artigo Científico
Fonte: INTERNATIONAL GEOLOGY REVIEW; v. 57, n. 11-12, p. 24-pg., 2015-09-10.
Resumo

Fifty-five new multi-dimensional diagrams, mostly based on log-ratio transformations, were used to decipher tectonic settings for 17 cases of Precambrian belts in Canada, the USA, Poland, Finland, Jordan, Democratic Republic of CongoandZambia, China, and India. The results of different sets of diagrams for basic-ultrabasic, intermediate, and acid magmas were generally internally consistent. Possible reasons for some inconsistencies may be related to the use of a sample group of mixed ages because of their uncertainties, extreme element mobility caused by metamorphism especially of high-grade type, analytical data quality, different petrogenetic processes for basic to acid magmas such as mantle versus crustal origin, and some deficiencies that still exist in the multi-dimensional diagrams. To partly overcome the last problem, one new multi-dimensional diagram is proposed and used to discriminate mid-ocean ridge and oceanic plateau settings. (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