Ocorrência e variabilidade de composição dos fosfatos do grupo monazita em carbonatitos

Monazite structural group includes arsenates, phosphates, and silicates, with general formulae A B O4 , (A = Bi, Ca, Rare Earth Elements, Th, U and B = As5+, P5+, Si4+). Among them, the phosphate monazite is the most abundant independent Rare Earth Element mineral, occurring in several geological si...

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Detalles Bibliográficos
Autores: Toledo, Maria Cristina Motta de, Pereira, Vitor Paulo
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2003
País:Brasil
Institución:Universidade Federal do Rio Grande do Sul (UFRGS)
Repositorio:Repositório Institucional da UFRGS
Idioma:inglés
OAI Identifier:oai:www.lume.ufrgs.br:10183/22597
Acceso en línea:http://hdl.handle.net/10183/22597
Access Level:acceso abierto
Palabra clave:Monazita
Carbonatito
Monazite
Rare earth elements
Carbonatites
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spelling 2010-05-20T04:16:18Z20031518-2398http://hdl.handle.net/10183/22597000390628Monazite structural group includes arsenates, phosphates, and silicates, with general formulae A B O4 , (A = Bi, Ca, Rare Earth Elements, Th, U and B = As5+, P5+, Si4+). Among them, the phosphate monazite is the most abundant independent Rare Earth Element mineral, occurring in several geological sites. It presents a variable composition and morphology and has strong chemical and physical stability. This paper presents a review about this mineral, particularly for monazite associated with carbonatite complexes. Detailed study of the composition of monazite will improve geochemical and petrological interpretations. In the economic field, monazite is, with bastnaesite, an ore mineral present in the main deposits in the world; its morphological and composition characteristics have influence in ore quality and in efficiency of concentration processes. Since the seventhies, its importance reachs the environmental field and his highly stable structure has been investigated as model for a synthetic phase to long-term storage of radionuclides from nuclear waste. The most important monazite ore deposits in Brazil are alluvional Monazite occurs also in other materials, mainly in carbonatites and their weathering products, which may constitute important source of REE. In these rocks, because its high stability and possibility of weathering genesis, monazite is the most important among the phosphate minerals. However, researches about monazite associated with Brazilian carbonatitic materials have shown mainly unfavourable morphological characteristics for economic profit.application/pdfengPesquisas em Geociências. Porto Alegre, RS. Vol. 30, n. 1 (2003), p. 83-98.MonazitaCarbonatitoMonaziteRare earth elementsCarbonatitesOcorrência e variabilidade de composição dos fosfatos do grupo monazita em carbonatitosinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSToledo, Maria Cristina Motta dePereira, Vitor PauloORIGINAL000390628.pdf000390628.pdfTexto completoapplication/pdf205910http://www.lume.ufrgs.br/bitstream/10183/22597/1/000390628.pdf6c7752fc6674b2c92dddde31c6ddd37cMD51TEXT000390628.pdf.txt000390628.pdf.txtExtracted Texttext/plain71648http://www.lume.ufrgs.br/bitstream/10183/22597/2/000390628.pdf.txt1a47980ece49d6faa09a312da845a3e7MD52THUMBNAIL000390628.pdf.jpg000390628.pdf.jpgGenerated Thumbnailimage/jpeg1676http://www.lume.ufrgs.br/bitstream/10183/22597/3/000390628.pdf.jpg700e9ebf17ff2027a99822e3e834082bMD5310183/225972018-10-11 08:27:57.014oai:www.lume.ufrgs.br:10183/22597Repositório InstitucionalPUBhttps://lume.ufrgs.br/oai/requestlume@ufrgs.bropendoar:2018-10-11T11:27:57Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Ocorrência e variabilidade de composição dos fosfatos do grupo monazita em carbonatitos
title Ocorrência e variabilidade de composição dos fosfatos do grupo monazita em carbonatitos
spellingShingle Ocorrência e variabilidade de composição dos fosfatos do grupo monazita em carbonatitos
Toledo, Maria Cristina Motta de
Monazita
Carbonatito
Monazite
Rare earth elements
Carbonatites
title_short Ocorrência e variabilidade de composição dos fosfatos do grupo monazita em carbonatitos
title_full Ocorrência e variabilidade de composição dos fosfatos do grupo monazita em carbonatitos
title_fullStr Ocorrência e variabilidade de composição dos fosfatos do grupo monazita em carbonatitos
title_full_unstemmed Ocorrência e variabilidade de composição dos fosfatos do grupo monazita em carbonatitos
title_sort Ocorrência e variabilidade de composição dos fosfatos do grupo monazita em carbonatitos
dc.creator.none.fl_str_mv Toledo, Maria Cristina Motta de
Pereira, Vitor Paulo
author Toledo, Maria Cristina Motta de
author_facet Toledo, Maria Cristina Motta de
Pereira, Vitor Paulo
author_role author
author2 Pereira, Vitor Paulo
author2_role author
dc.subject.por.fl_str_mv Monazita
Carbonatito
topic Monazita
Carbonatito
Monazite
Rare earth elements
Carbonatites
dc.subject.eng.fl_str_mv Monazite
Rare earth elements
Carbonatites
description Monazite structural group includes arsenates, phosphates, and silicates, with general formulae A B O4 , (A = Bi, Ca, Rare Earth Elements, Th, U and B = As5+, P5+, Si4+). Among them, the phosphate monazite is the most abundant independent Rare Earth Element mineral, occurring in several geological sites. It presents a variable composition and morphology and has strong chemical and physical stability. This paper presents a review about this mineral, particularly for monazite associated with carbonatite complexes. Detailed study of the composition of monazite will improve geochemical and petrological interpretations. In the economic field, monazite is, with bastnaesite, an ore mineral present in the main deposits in the world; its morphological and composition characteristics have influence in ore quality and in efficiency of concentration processes. Since the seventhies, its importance reachs the environmental field and his highly stable structure has been investigated as model for a synthetic phase to long-term storage of radionuclides from nuclear waste. The most important monazite ore deposits in Brazil are alluvional Monazite occurs also in other materials, mainly in carbonatites and their weathering products, which may constitute important source of REE. In these rocks, because its high stability and possibility of weathering genesis, monazite is the most important among the phosphate minerals. However, researches about monazite associated with Brazilian carbonatitic materials have shown mainly unfavourable morphological characteristics for economic profit.
publishDate 2003
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dc.relation.ispartof.pt_BR.fl_str_mv Pesquisas em Geociências. Porto Alegre, RS. Vol. 30, n. 1 (2003), p. 83-98.
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