Geological Survey
Mostrando 13-24 de 42 artigos, teses e dissertações.
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13. Relações solo-vegetação no Parque Nacional da Serra do Cipó, Espinhaço Meridional, Minas Gerais / Soil vegetation relationships in the National Park Serra do Cipó, in Espinhaço Meridional, Minas Gerais
The region of Serra do Rio Cipó, in the southern part of the Serra do Espinhaço, comprises large areas of Cerrado, Atlantic forest, forest islands and one of the richest high-altitude rocky vegetation in Brazil. The ecotonal character between the Cerrado and Atlantic Forest biomes, described in many studies of regional flora and fauna, is one of the factor
Publicado em: 2009
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14. Construindo a imagem geológica do Quadrilátero Ferrífero: conceitos e representações
Na passagem século XVIII para o XIX, surgiram os primeiros trabalhos científicos apresentando noções da geologia da porção centro-sudeste do estado de Minas Gerais, a partir daí esta área foi se consolidando como objeto de pesquisas geológicas. Passado pouco mais de um século, ficou conhecida mundialmente como uma das maiores províncias minerais d
Publicado em: 2009
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15. Airborne geophysical and geological data applied to the selection of groudwater potential areas in crystalline rocks of Ceara, Brazil / Dados aerogeofisicos e geologicos aplicados a seleção de areas favoraveis para agua subterranea no dominio cristalino do Ceara, Brasil
The location of water well in Northeast Brazil is usually based on the interpretation of structural lineaments in aerial-photographs and electromagnetic and electrical resistivity ground geophysics surveys. However, the success of these techniques is variable, and the small coverage area is another limitation. This Thesis favors a different approach, the use
Publicado em: 2008
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16. A aqÃicultura como alternativa de reabilitaÃÃo ambiental para Ãreas mineradas na RegiÃo Metropolitana do Recife â RMR e Goiana/PE
Currently, the Mineral Industry seeks to support the sector in models of social and environmental sustainability, because of conservation policies and increasing social demands. To this end, with complex environmental management systems that enable the creation of appropriate conditions (recovery) for future use (rehabilitation) of the exploited area (degrad
Publicado em: 2008
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17. Estudo geoestrutural do maciÃo de Granito Vermelho Frevo SertÃnia-PE
The purpose of this report is to recommend a new methodology for prospecting ornamental rocks massifs. This is why it is important to supply the technical staff, for the future operations of mining of knowledgement of the petrographic and physical-mechanical features of the rock to be extracted and the regime of tensions to be submitted to define the best sy
Publicado em: 2008
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18. Aerogeofísica aplicada à compreensão do sistema de empurrões da sequência Santa Terezinha de Goiás, Brasil Central
Recent Airborne Survey data from the Goias state was processed and interpreted in the present dissertation. Radiometric data was adquired sampling between 1 s and 0.1 s for magnetometry, flying at a height of 100 meters, with spacing of 500m and tied with control lines with spacing of 5000m, collected througout NS production lines. We describe the techniques
Publicado em: 2007
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19. Mercury occorrence at the Iguaçu River Basin, State of Parana, Brasil / Ocorrencia de mercurio na Bacia do Rio Iguaçu, Estado do Parana, Brasil
Mercury contents in rocks, soil and stream sediment were determined to investigate the origin of the geochemical anomaly found in sediments of the Iguaçu River, as indicated in previous studies of a regional geochemistry survey. Except for its headwaters in the Curitiba area, with Precambrian basement rocks and Pleistocenic sediments of the Curitiba Basin,
Publicado em: 2007
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20. Interpretação de dados de eletromagnetometria aerotransportada (AEM) do sistema GEOTEM (domínio do tempo)
Desde 1950 estudos vem sendo realizados na aplicação da condutividade elétrica ao mapeamento geológico, com ênfase nos sistemas aeroeletromagnéticos. Estes sistemas usam o campo eletromagnético secundário obtido por contrastes em propriedades elétricas em subsuperfície em resposta a perturbações criadas por fontes eletromagnéticas naturais ou ar
Publicado em: 2007
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21. Cráton do São Franscisco, kimberlitos e diamantes
The São Francisco Craton is a large stable area in the eastern portion of South America. Its basement comprises Archean terrains that were reworked and amalgamated during Paleoproterozoic tectonic events and later on affected marginally by the Neoproterozoic Brasiliano orogeny, during the amalgamation of West Gondwana. In this work the geological evolution
Publicado em: 2007
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22. DesG: uma nova metodologia para intervenção e coleta de dados magnetotelúricos / DesG: a new methodology for intervention and it collects of magnetotelluric data
This thesis presents two contributions to magnetotelluric data interpretation. The first one is a new MT inversion method, named Geologic-Descriptive Method (DesG) because it explicitly incorporates a priori information, keeping a close correspondence with the standard description of geological features. The user defines by means of geometric elements (point
Publicado em: 2006
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23. Petrografic and geochemistry study of the embasament and San Ignácio and Sunsás granitic rocks of the San Ramon, Concepción region, SW Amazonian Craton of Bolívia / Estudo petrográfico e geoquímico do embasamento e dos granitóides San Ignácio e Sunsás da região San Ramon, Concepción, SW do cráton amazônico da Bolívia.
The main objectives of this work were the petrographic characterization and geochemistry studies of the Sunsas granitic intrusions and their country rocks in the Bolivian sector of the SW Amazonian craton. The studied units comprise the Sunsas Orogeny granitoids (1,30 Ga-950 Ma), the basement (>1400 Ma) including La Chiquitania gneiss, enderbitic and graniti
Publicado em: 2006
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24. Integração de dados de geofísica aérea aplicada à geologia e à prospecção mineral no distrito esmeraldífero de Itabira-Ferros, Quadrilátero Ferrífero, MG.
The Itabira-Ferros area is located in the Quadrilátero Ferrifero region, State of Minas Gerais, and it is known for abundant emerald occurrences. The area is characterized by volcanic metasedimetary sequences of the greenstone belt type (Rio das Velhas Super group) and paleoproterozoic iron formations of Minas Super Group, inserted in granitic bobies (Borra
Publicado em: 2006