Sedimentation And Deposition
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. Sedimentary and U-Pb detrital zircons provenance of the Paleoproterozoic Piracicaba and Sabará groups, Quadrilátero Ferrífero, Southern São Francisco craton, Brazil
Abstract The Quadrilátero Ferrífero is an important mineral province located in Southern São Francisco craton, SE Brazil. Its prominent feature is the Gandarela syncline that was formed as part of the regional deformation event in the southernmost part of the craton at ca. 2,000 Ma. The syncline exposes several economically important units of Rio das Velh
Braz. J. Geol.. Publicado em: 03/06/2019
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2. Rheology applied to the environmental management of mineral tailings: focus on safer disposal and water reuse
Abstract Mining activities worldwide are subject to serious geotechnical accidents involving tailings dams. Therefore, many studies have focused on tailings dewatering before their deposition. This article studies the rheological properties of flocculated and thickened nickel tailings in order to determine the effect of the initial solid concentration and ty
REM, Int. Eng. J.. Publicado em: 2019-06
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3. Sediment Morphology, Distribution, and Recent Transport Dynamics in a Reforested Fragment
Abstract Erosion generates large amounts of sediment, which may be deposited at the site of origin, on the slope of a hill, or along waterways. The transportability of each type of sediment by runoff and its potential for subsequent deposition largely depends on its morphological features and particle size distribution. The aim of this study is to describe a
Rev. Bras. Ciênc. Solo. Publicado em: 24/08/2017
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4. Sedimentology and chemostratigraphy of a Valanginian carbonate succession from the Baja Guajira Basin, northern Colombia
ABSTRACT: The Kesima Member of the Palanz Formation constitutes the first record of Cretaceous marine sedimentation along the Baja Guajira Basin, northern Colombia. Sedimentologic and petrographic analyses suggest a deposition along a coral reef dominated rimmed carbonate platform. 87Sr/86Sr values between 0.707350 and 0.707400 suggest a Valanginian (136 - 1
Braz. J. Geol.. Publicado em: 2016-06
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5. Deposição e exportação de sólidos e nutrientes na sub-bacia do Ribeirão das Cruzes, baixo Tietê (SP) / Solids and nutrients deposition and exports in Ribeirão das Cruzes sub-basin, Baixo Tietê (SP)
A qualidade ambiental de um corpo d\ água é resultado da situação de sua bacia de drenagem, de modo que as transformações que ocorrem no solo do entorno provocam mudanças significativas no ambiente aquático. Por isto, cada vez mais se trabalha com conceito de manejo integrado dos ambientes. Desta forma, o conhecimento dos processos de geração, tran
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/09/2012
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6. Estudo palinoestratigráfico e de petrografia orgânica do Cretáceo inferior da Bacia do Recôncavo / Palynostratigraphic and organic petrography studies of the Recôncavo basin early Cretaceous deposits
The present study was based on vertical variations analysis of the organic matter from 50 core samples collected from the well 9-FBA-61-BA, allowing better understanding of the Early Cretaceous of Reconcavo Basin palynological and palynofacies characteristics. Observations throughout combined light and blue light/UV fluorescence techniques, permitted to defi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2011
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7. Rb-Sr systematics of holocene pelitic sediments and their bearing on whole-rock dating
In many cases, when dealing with argillaceous fine-grained sedimentary rocks, the isotopic ages obtained from Rb–Sr whole-rock isochron calculations are of geological significance, despite the fact that the initial conditions of Sr isotopic homogenization are not fulfilled. To explain this, a mechanical mixing during deposition has been suggested, leading
Publicado em: 2011
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8. Tectônica e sedimentação na Bacia do Camaquã Central (RS): exemplos do Grupo Guaritas e do Grupo Santa Bárbara / Tectonics and sedimentation in Central Camaquã Basin: the Guaritas Group and the Santa Bárbara Group
The relationship between tectonics and sedimentation plays a primordial role in the understanding of sedimentary successions. On the other hand, the study of pre-Silurian fluvial deposits represents a challenge due to the lack of interaction between land plants and river systems which characterizes post-Silurian environments. The Camaquã Basin (Ediacaran to
Publicado em: 2010
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9. Significados paleoambientais e paleoclimáticos dos Paleossolos : uma revisão
The majority of paleosols are described from continental deposits, most commonly from alluvial strata. In these continental records to much little is revealed of conditions between events of sedimentation. In alluvial sedimentary environments, a record of these conditions is not lost and gone forever. They may be interpreted from fossil soils formed on depos
Publicado em: 2010
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10. 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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11. DETERMINAÇÃO DE MARCADORES ORGÂNICOS NO PERFIL SEDIMENTAR DO COMPLEXO ESTUARINO DE PARANAGUÁ (PR) POR CG-EM
The input evaluation of the organic matter in aquatic environment by anthropic activity can be done by the identification and quantification of molecular markers. Many studies point the application of the molecular markers for this objective but few of them evaluate the variation of the compound concentration through a long period of time registered on the s
Publicado em: 2009
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12. Processos dinÃmicos e evolutivos da zona costeira de Itamaracà por sensoriamento remoto e medidas in situ
The coastal zone of Itamaracà is like a highly dynamic environment where land and oceanic processes interact altering frequently coastal characteristics. In this context, this current study examines the responsible processes of such changes from the development and application of methodologies, which includes digital image processing and the obtaining of in
Publicado em: 2009