Igneous Rocks
Mostrando 1-12 de 37 artigos, teses e dissertações.
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1. Geochemistry and Spatial Variability of Rare Earth Elements in Soils under Different Geological and Climate Patterns of the Brazilian Northeast
ABSTRACT Growth in the agricultural and industrial sectors has increased the demand for rare earth elements (REEs) in the production of technological devices and fertilizers. Thus, the accumulation of these elements in the soil has become an environmental concern. Here, we aim to determine the natural contents of REEs in soils derived from different parent m
Rev. Bras. Ciênc. Solo. Publicado em: 02/07/2018
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2. Geochemistry of the Northern Paraná Continental Flood Basalt (PCFB) Province: implications for regional chemostratigraphy
ABSTRACT: The Paraná Continental Flood Basalt (PCFB) province is one of the largest igneous provinces on Earth, but little is known about the architecture and geochemical characteristics of the lava flows. In this context, a set of borehole samples arranged in an NEE-SWW profile - more than 600 km long - located in the northern PCFB was used to define its c
Braz. J. Geol.. Publicado em: 2018-06
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3. Nepheline syenites to syenites and granitic rocks of the Itatiaia Alkaline Massif, Southeastern Brazil: new geological insights into a migratory ring Complex
ABSTRACT: The Itatiaia Alkaline Massif comprises some of the largest meso-cenozoic alkaline igneous occurrences in Brazil, covering over 215 km2 between the states of Minas Gerais and Rio de Janeiro. It appears as an elongated, 30-km long and 4.5-11.5-km wide SE-NW-trending body emplaced along accommodation zones of the Continental Rift of Southern Brazil, i
Braz. J. Geol.. Publicado em: 21/05/2018
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4. Baseline and Quality Reference Values for Natural Radionuclides in Soils of Rio de Janeiro State, Brazil
ABSTRACT A first large-scale systematic survey of natural radioactivity contents of soils of the state of Rio de Janeiro is presented, focused on the establishment of Quality Reference Values (QRVs). Undisturbed soil samples were collected from 243 areas and analyzed by gamma spectrometry. The activity contents varied largely, ranging from 12.2 to 1,029 Bq k
Rev. Bras. Ciênc. Solo. Publicado em: 22/01/2018
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5. Petrography and geochemistry of the Pedra Dourada Granulite, southeastern Minas Gerais, Brazil
Abstract The Pedra Dourada Granulite (PDG) occurs at the southeastern portion of the Araçuaí Belt, north of the town of Ponte Nova. It comprises bodies up to 45 km2 inserted into amphibolite-facies gneisses of the Mantiqueira Complex. Motivated by the discrepancy of metamorphic grade with surrounding rocks, this paper presents results of the petrographic a
REM, Int. Eng. J.. Publicado em: 2016-12
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6. CAPACIDADE DE USO DA TERRA E PERDA DE SOLO EM UMA PROPRIEDADE REPRESENTATIVA NA BACIA HIDROGRÁFICA DO RIO DO ATALHO, CRUZ MACHADO PR.
This study sought to evaluate the contribution of different sources producing in sediment on a representative property in river basin of the shortcut, Cruz Machado, PR, and through utility survey of the physical environment in the basin was proposed map a capacity of land use to basin and a in specific for property in representative. The property has a repre
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/11/2011
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7. Caracterizacao de solos por padroes de drenagem e sua relacao com indices de intemperismo.
A caracterizacao de solos por meio do estudo fotopedologico pode auxiliar futuros levantamentos de solos. Foram estudados, em quatro regioes do Estado do Parana, solos desenvolvidos de rochas eruptivas basicas e acidas, utilizando-se fotografias aereas de escala 1:25:000, nas quais foram locadas amostras circulares de 10 km2. Foram caracterizados e estudados
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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8. Geoquímica de minerais detríticos em estudos de proveniência : uma revisão
The chemical composition of detrital minerals in sediments has become a powerful tool for provenance studies, particularly in the last decades with the improvement of analytical techniques for mineral grains. Major and trace element contents of igneous and metamorphic minerals can reveal the characteristics of their original sources, mainly with respect to t
Publicado em: 2010
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9. O deposito de oxido de ferro-cobre-ouro bacaba, provincia mineral de Carajas, PA : geocronologia U-Pb das rochas hospedeiras / Iron oxide-Cu-Au bacaba deposit, Carajas mineral province (PA), Brazil : U-Pb geocronology of the host rocks
The Bacaba iron oxidecoppergold deposit, situated in the Itacaiúnas Shear Belt, Carajás Mineral Province (Brazil), represents a satellite prospect of the world-class Sossego deposit, and might also represent a distal and deeper portion of the same or related hydrothermal system. The Bacaba deposit is located along a WNWESE-striking shear zone that de
Publicado em: 2010
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10. Estratigrafia do batólito Florianópolis, cinturão Dom Feliciano, na região de Garopaba-Paulo Lopes, SC
In southern Brazil, the Florianopolis Batholith results from prolonged, mainly granitic magmatism, as part of the Neoproterozoic Dom Feliciano Belt. Plutonic associations in this belt are related to transpressive tectonism (650-580 Ma) in post-collisional setting, where the translithospheric discontinuities of the Southern Brazilian Shear Belt have triggered
Publicado em: 2010
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11. CALFRAC: Programa que quantifica o processo de cristalização fracionada e sua aplicação ao estudo de soleiras da Bacia do Paraná (Estado do Paraná) / CALFRAC: Program to quantify fractional crystallization processes and your application in the study Paraná Basin sills (Paraná).
CALFRAC is a computer program written in C++ programming language developed to quantify fractional crystallization processes in igneous systems. Major, minor and trace element concentrations are used as input for calculations. The new algorithm enhances and makes the program more efficient than those published in the literature. Besides it is capable to auto
Publicado em: 2010
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12. Petrologia e metalogenia do depósito primário de nióbio do complexo carbonatítico-foscorítico de Catalão I, GO
The Catalão I carbonatite-phoscorite complex is part of the Alto Paranaíba Igneous Province (APIP) and consists of a multi-intrusion body zoned from bebedourite-(piroxenite)-series rocks in the border to carbonatite- and phoscorite-series rocks in the core. The phoscorite-series rocks consist of apatite, magnetite and a Mg-silicate (phlogopite or olivine)
Publicado em: 2009