Epigenetic Ore
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Survey and study of graphite occurrences in the Aracoiába-Baturité graphite bearing District, CE / Levantamento e estudo das ocorrências de grafita do Distrito Grafitífero Aracoiába-Baturité, CE
The Aracoiába-Baturité Graphite-bearing District has graphitic gneiss deposits (disseminated ore) and vein (solid ore) with different genetic origins and their own physical characteristics and geological environments. The graphite gneiss ore is of sedimentary, syngenetic origin, with 1.5% to 8% C content, which is distributed along two long parallel belts,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2011
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2. Características epigenéticas do depósito de cu-au chapada, arco magmático de goiás
The Cu-Au Chapada deposit is located from 8km of Alto Horizonte-GO. The geologic picture is dominated by metavulcanic sedimentary sequences that integrate the Neoproterozoic Magmatic Arc of Mara Rosa, located in the central portion of the Tocantins Province. The framework of the deposit is represented by an antiform whose core is composed by association of t
Publicado em: 2009
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3. Evolução geológica, geoquímica e isotópica das mineralizações de geodos com ametista, Artigas, República Oriental do Uruguai
O Distrito Mineiro de Artigas, no Uruguai, compreende uma das maiores jazidas de ametista e ágata de que se tem conhecimento e é comparável às jazidas da região do Alto Uruguai, próximas ao município de Ametista do Sul, Brasil. A mineralização ocorre em geodos parcialmente preenchidos por ágata, quartzo incolor, ametista e ± calcita, que ocorrem n
Publicado em: 2008
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4. Caracterização das rochas vulcânicas e plutônicas félsicas e intermediárias do Alvo Estrela (Cu-Au), Serra de Carajás, Pará
The Estrela Cu-Au deposit is situated in the Serra do Rabo, at the easternmost part of Carajás shear zone, at the Serra dos Carajás region. It is hosted by altered andesites and gabbros and rhyolites of the Grão Pará Group, Itacaiunas Supergroup, formed at 2.76 Ga (Sm-Nd isochronic age) cut by Paleoproterozoic porphyritic quartz diorite, orthoclase-albit
Publicado em: 2006
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5. Genese dos depositos auriferos em metaconglomerados da formação moeda, Quadrilatero Ferrifero, MG : o papel do metamorfismo e associação com a materia carbonosa / Genesis of the metaconglomerate-hosted gold deposits of the moeda formation, Quadrilatero Ferrifero (State of Minas Gerais) : role of the metamorphism and the association with carbonaceous matter
The Quadrilátero Ferrífero has historically been one of the most important gold province in Brazil, with a significant number of productive greenstone-hosted lode gold deposits within the Rio das Velhas Supergroup together with those associated with the metasedimentary sequence of the Minas Supergroup. At the base of the Moeda formation, Minas Supergroup,
Publicado em: 2005
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6. Geoquimica e impacto ambiental do arsenio no Vale do Ribeira (SP-PR)
The sedimentary and volcanic rocks of the Ribeira Valley, in the Apiaf FoId Belt, host a variety of PbZn deposits, which were formed by singenetic (Perau-type) and epigenetic (Panelas-type) models. Long-term mining activities originated a toxic contamination by arsenic in the stream sediments of the Ribeira de Iguape river that drains the region. The purpose
Publicado em: 1997
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7. Controle estrutural da mineralização aurifera na mina de Cuiaba, setor noroeste do Greenstone Belt, Rio das Velhas, Quadrilatero Ferrifero, MG / Structural control of the gold mineralization at the Cuiaba mine, northwestern sector of the Rio das Velhas Greenstone Belt, Quadrilatero Ferrifero, MG
The Cuiabá Mine is located in the northem portion ofthe Quadrilátero Ferrífero, within a sequence of Archean rocks forrning the base of the Rio das Velhas greenstone belt. This research focused on geological mapping at a scale of l:100 and detailed studies of the tectonic structures observed in the Cuiabá Mine. Its main objective is to present the result
Publicado em: 1997