Messias Gilmar de Menezes

Universidade Federal de Ouro Preto

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Roberto Ventura Santos

Universidade de Brasília

M. V. B. Pinheiro

Universidade Federal de Minas Gerais

Claudinei Gouveia de Oliveira

Universidade de Brasília

Ludmila Maria Motta Pereira

Serviço Geológico do Brasil - CPRM

Mario Luiz de Sá Carneiro Chaves

Universidade do Estado do Rio de Janeiro

Frederico Wallace Dos Reis Vieira

Itabras Mineração (Brazil)

Ricardo Scholz

Universidade Federal de Ouro Preto

Selma Fernandes

Centro Universitário do Norte Paulista

Patrícia Alves Junqueira

Serviço Geológico do Brasil - CPRM

Luiz Cláudio Rebeiro-Rodrigues

Cooperative Institutions

Instituto de Geociencias

Universidade Federal de Minas Gerais

National Council for Scientific and Technological Development

Serviço Geológico do Brasil - CPRM

Universidade Federal de Ouro Preto

Universidade de Brasília

Instituto de Investigaciones en Ciencias de la Salud

Prefeitura Municipal de Belo Horizonte

Paderborn University

Centro de Desenvolvimento da Tecnologia Nuclear

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Geoquímica de isótopos de carbono de rochas carbonosos do Quadrilátero Ferrífero, Minas Gerais

Brazilian Journal of Geology (1995)

Roberto Ventura Santos Selma Fernandes Messias Gilmar de Menezes Claudinei Gouveia de Oliveira

O Macico Alcalino de Cananeia e um pequeno stock, de forma elfptica, localizado na cidade homonima, na porcao sul do Estado de Sao Paulo. A analise do padrao de fraturamento do macico indicou a provavel vigencia de duas fases de deformacao, a primeira com extensao NE-SW, de idade cretacea superior, e a segunda, com carater transcorrente sinistrai, de direcao E-W, com compressao NE-SW e extensao NW-SE, de idade paleogenica, provavelmente eocenica. Estas duas fases apresentam relacoes com deformacoes ocorridas ao longo das feicoes tectonicas regionais, estando a primeira fase ligada a extensao ao longo do Alinhamento de Guapiara, que integra o Arco de Ponta Grossa, e a segunda com a transcorrencia sinistrai, de direcao E-W, que propiciou a reativacao cenozoica de antigas zonas de cisalhamento de direcoes ENE-WSW a E-W de idade proterozoica, estas tambem responsaveis pela instalacao e deformacao das bacias que compoem o Rift Continental do Sudeste do Brasil.

10.5327/rbg.v25i2.519

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Citations (1)

Styles of hydrothermal alteration and gold mineralizations associated with the Nova Lima Group, Quadrilátero Ferrífero: Part I, description of selected gold deposits

Brazilian Journal of Geology (1998)

Lydia Maria Lobato Frederico Wallace Dos Reis Vieira Luiz Cláudio Rebeiro-Rodrigues Ludmila Maria Motta Pereira Messias Gilmar de Menezes

Three main mineralization styles are recognized in a number of mesothermal, lode-gold deposits associated with rocks of the Nova Lima Group, Rio das Velhas Archean Greenstone Belt, Quadrilatero Ferrifero, Minas Gerais, Brazil. They comprise 1) structurally controlled, sulfide-replacement zones in metamorphosed oxide- and carbonate-facies BIF; 2) shear-related, disseminated sulfides in nydrothermal alteration zones within metamorphosed mafic volcanic- or sedimentary rocks; and 3) Auriferous quartz-carbonate-sulfide veins and veinlet systems. These styles reflect variations in fluid to rock interaction, and thereby a distinctive ore mineral compoSition. In addition, distinctive mineral associations characterize hydrothermal alteration zonal patterns around orebodies. Det alled investigations in Cuiaba, Juca Vieira, Raposos, Santana and Sao Bento mines indicate that, as is the case with other similar deposits worldwide, the processes of ore depoSition are the same processes that give rise to the alteration assemblages. Hydrothermal alteration overprints metamorphic assemblages, and is overall dominated by zones of chlorite, carbonate and white mica development in proximity to ore. Sulfidation and silicification abound in the latter two, minerallogically simple, inner alteration zones. These characteristics suggest variations in the H2O to CO2-ratio of the sulfur-bearing, aqueous-carbonic ore fluid and interaction at varying fluid to rock ratios with the progression of hydrothermal alteration.

Mesothermal

Hypogene

Greenstone belt

Arsenopyrite

10.5327/rbg.v28i3.637

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Citations (16)

Brazilian Quartz Deposits with Special Emphasis on Gemstone Quartz and its Color Treatment

Springer geology (2012)

Ricardo Scholz Mario Luiz de Sá Carneiro Chaves Klaus Krambrock M. V. B. Pinheiro Sandra de Brito Barreto

Pegmatite

10.1007/978-3-642-22161-3_6

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Citations (14)