Volcanic Bodies
Mostrando 13-18 de 18 artigos, teses e dissertações.
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13. Rochas metamorficas maficas e ultramaficas do Greenstone Belt Barbacena na região de Itutinga, MG
In the area around ltutinga-Nazareno, Minas Gerais State, at the southeastem limit of São Francisco Craton, there are outcrops of thick successions of volcanic mafic and ultramafic rocks that are the subbject of the present study. This volcano-sedimentary succession is mainly constituted by metabasalts, metakomatiites and minor metassedimentary rocks, and i
Publicado em: 2000
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14. Natureza e evolução dos fluidos hidrotermais no deposito cupro-aurifero Golden Hill, Camaguey, Cuba
The Cu-Au mineralization at the Golden Hill deposit in the Las Tunas Province, Eastem Cuba, is characterized by breccia-hosted massive and semi-massive sulfide bodies confined to the Contramaestre Fonnation in the Cretaceous Volcanic Arc. The deposit is enveloped by a silicic, argillic and advanced argillic alteration assemblage, typical of high sulfidation
Publicado em: 2000
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15. 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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16. Intrusões sub-vulcanicas alcalinas e lamprofiros nas mineralizações auriferas do Greenstone Belt do Rio Itapicuru, Bahia : petrografia, geoquimica e inclusões fluidas
At the Fazenda Maria Preta (FMP) and Mari (MR) gold deposits, in the Rio Itapicuru greenstone belt (RIGB), two host volcanic rocks and a mafic dyke were studied and reclassified. In the Corpo H body (FMP) the host roek is called silicified dacite, but in this worlc, based on the mineralogy and textural ftamework, the roek is reclassified as alkali-feldspar s
Publicado em: 1997
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17. Estudos geoquimicos e isotopicos das mineralizações auriferas e rochas associadas da Região de Pontes e Lacerda (MT)
Geochemistry and isotope studies were carried out on the gold deposits of Pontes e Lacerda region (Mato Grosso state, Brazil) where rocks of the Aguapei and Rondoniense mobile belts (SW of Amazon Craton) occur. The stratigraphy of this part of Amazon Craton consists of the Pontes e Lacerda Metavulcano-sedimentar Sequence (PLMVSS), Santa Helena Granite-Gneiss
Publicado em: 1996
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18. Evolução geologica do pre-cambriano da porção centro-leste da serra do Espigão meridional e metalogenese associada
A porção centro-leste da Serra do. Espinhaço Meridional é caracterizada principalmente por terrenos de idade Pré-Cambriana, incluindo seqüências do Arqueano (Complexo de Gouveia, de alto grau metamórfico, e Grupo Pedro Pereira, de baixo grau) e do Proterozóico (todas de baixo grau metamórfico: Grupo Costa Sena, Supergrupo Espinhaço "sensu stricto"
Publicado em: 1990