Source Rocks
Mostrando 25-36 de 83 artigos, teses e dissertações.
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25. O método radiométrico RB-Sr aplicado em rochas sedimentares o exemplo da bacia do Paraná, Brasil
The Rb-Sr method has been successfully applied to argillaceous sedimentary rocks in order to supply parameters for the definition of their depositional ages. In many studied cases, despite the geologically significant results, there are doubts concerning the interpretation of the obtained data and their limitations. This happens because sedimentary rocks are
Publicado em: 2010
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26. Áreas fontes dos minerais pesados e sua distribuição sobre a plataforma continental sul-brasileira, uruguaia e norte-argentina
The heavy mineral fraction of sedimentary rocks and sediments can provide important information about provenance in sedimentary basins studies because some minerals or group of minerals can be traced to a source rock or terrain of specific composition. This work is a provenance study based on heavy mineral analyses of samples collected on the Rio Grande do S
Publicado em: 2010
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27. Geocronologia U-Pb em Zircão Detrítico aplicada ao estudo de proveniência de metassedimentos do Complexo Metamórfico Porongos ¿ Região de Santana da Boa Vista, RS
Provenance studies based upon detritic zircon grain U-Th-Pb methodology (LA-ICP-MS) from metasediments of Porongos Metamorphic Complex have determined the existence of two principal source-areas with paleoproterozoic and mesoproterozoic ages to the schists of Arroio Areião, Cerro Cambará and associated quartz mylonites. Where obtained ages between 967 ± 1
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2010
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28. Metalogênese do depósito de cobre Cerro dos Martins, RS: revisão e geoquímica isotópica de SR, O e C-
This paper presents the geology, chemical data, Pb-Pb zircon ages, sulfur, carbon, oxygen, strontium isotopes and fluid inclusions of Cerro dos Martins copper deposit. The deposit is hosted by the Neoproterozoic volcano-sedimentary sequence of the Camaquã Basin in the Rio Grande do Sul Shield, southern Brazil. The ores consist of a set of Cu-sulfide NW-tren
Publicado em: 2010
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29. 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 sites. It presents a variable composition and morphology and h
Publicado em: 2010
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30. Evolução tectono-estratigráfica e paleoclimática da formação maricá (Escudo Sul-Rio-Grandense, Brasil) : um exercício de geologia histórica e análise integrada de uma bacia sedimentar neoproterozóica
Significant improvement in the knowledge concerning the Neoproterozoic Maricá Formation of the Sul-riograndense Shield, southern Brazil, was obtained in the latest years. This contribution synthesizes recent data obtained though an integrated analysis of the lowermost unit of the “Camaquã Basin”. Stratigraphic and paleocurrent analyses, petrography, Sr
Publicado em: 2010
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31. Evolução magmática, alteração hidrotermal e gênese da mineralização de ouro e cobre do Palito, Província Aurífera do Tapajós (PA) / Magmatic evolution, hydrothermal alteration and geneseis of gold-copper mineralization at Palito, Tapajós Gold Province (PA)
The Palito porphyry type copper-gold deposit is located in the central region of the Amazonian craton, in the Tapajós Gold Province (TGP), in an area that is dominated by intermediate to felsic granitic and volcanic rocks of late Paleoproterozoic age. Three lithotypes make up this deposit. The Palito Granite, with porphyritic features, is the host rock for
Publicado em: 2010
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32. Geocronologia e evolução tectônica paleo-mesoproterozoica do oriente boliviano - região sudoeste do craton amazônico / Paleo-mesoproterozoic Tectonic Evolution and Geocronology of Eastern Bolivia, SW Amazonian Craton
This work characterizes the tectonic and magmatic evolution of the Precambrian shield of Bolivia. The complex geological evolution of the eastern Bolivia extends from the Paleo- to Mesoproterozoic, and can be related with the magmatic and metamorphic events that are ascribed to the Rio Negro - Juruena (1.78-1.60 Ga), Rondonian - San Ignacio (1.56-1.30 Ga) an
Publicado em: 2010
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33. La Formación Corumbataí y su importancia en la industria cerámica del estado de São Paulo - Brasil
The rapid development of the ceramic pole of Santa Gertrudes (São Paulo-Brazil) during the 90's was caused by the privileged localization of the raw material in conjunction with the technological development, large reserves, easy access of the highways helping the draining of the products as well as the proximity of the great consuming centers. This develop
Matéria (Rio de Janeiro). Publicado em: 07/04/2009
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34. Fosforitos do Grupo Bambuí na região de Campos Belos (GO)/ Arraias (TO), na borda oeste do Cráton São Francisco
Sao Bento, Coite 1 and Coite 2 are the three sedimentary phosphate deposits known to date in the Campos Belos (GO) and Arraias (TO) region. They are 3 low volume but high grade deposits, with more than 24% P2O5. The phosphorites and siltites found in that region occur at the bottom of the Sete Lagoas Formation, as part of the Neoproterozoic Bambui Group. The
Publicado em: 2009
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35. Gênese, distribuição e caracterização dos espongilitos do noroeste de Minas Gerais
This study relates to the spongillites deposits that occurs in shallow ponds on a karstic planation surface developed on rocks of the Neoproterozoic São Francisco Supergroup. Cenozoic siliciclastics sediments are related to this surface and Mesozoic Areado Group rocks occur adjacent to the deposits. Field studies associated with the analysis of multispectra
Publicado em: 2009
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36. Relações entre a cobertura vegetal e os meios físicos e antrópicos na Microbacia Córrego dos Veados, Tanque Grande, Guarulhos, SP.
The adoption of micro hydrographic basin as units of environmental studies hás made possible to analyze them in holistic way, as demand this type of research. In this case, this dissertation discusses studies in the area of the reservoir Tanque Grande, located in the city of Guarulhos, São Paulo State, Brazil. For in such a way, it was selected the micro h
Publicado em: 2009