Sr-Nd-Pb isotopic constraints on the nature of the mantle sources involved in the genesis of the high-Ti tholeiites from northern Paraná Continental Flood Basalts (Brazil)

There has been little research on geochemistry and isotopic compositions in tholeiites of the Northern region from the Paraná Continental Flood Basalts (PCFB), one of the largest continental provinces of the world. In order to examine the mantle sources involved in the high-Ti (Pitanga and Paranapanema) basalt genesis, we studied Sr, Nd, and Pb isotopic systematics, and major, minor and incompatible trace element abundances. The REE patterns of the investigated samples (Pitanga and Paranapanema magma type) are similar (parallel to) to those of Island Arc Basalts' REE patterns. The high-Ti basalts investigated in this study have initial (133Ma) 87Sr/86Sr ratios of 0.70538-0.70642, 143Nd/144Nd of 0.51233-0.51218, 206Pb/204Pb of 17.74-18.25, 207Pb/204Pb of 15.51-15.57, and 208Pb/204Pb of 38.18-38.45. These isotopic compositions do not display any correlation with Nb/Th, Nb/La or P2O5/K2O ratios, which also reflect that these rocks were not significantly affected by low-pressure crustal contamination. The incompatible trace element ratios and Sr-Nd-Pb isotopic compositions of the PCFB tholeiites are different to those found in Tristan da Cunha ocean island rocks, showing that this plume did not play a substantial role in the PCFB genesis. This interpretation is corroborated by previously published osmium isotopic data (initial γOs values range from+1.0 to+2.0 for high-Ti basalts), which also preclude basalt generation by melting of ancient subcontinental lithospheric mantle. The geochemical composition of the northern PCFB may be explained through the involvement of fluids and/or small volume melts related to metasomatic processes. In this context, we propose that the source of these magmas is a mixture of sublithospheric peridotite veined and/or interlayered with mafic components (e.g., pyroxenites or eclogites). The sublithospheric mantle (dominating the osmium isotopic compositions) was very probably enriched by fluids and/or magmas related to the Neoproterozoic subduction processes. This sublithospheric mantle region may have been frozen and coupled to the base of the Parana basin lithospheric plate above which the Paleozoic subsidence and subsequent Early Cretaceous magmatism occurred. © 2013 Elsevier Ltd.

Informe del Seminario-Taller sobre Políticas para el Control y la Fiscalización de la Contaminación Atmosférica de las Fuentes Fijas de los Sectores Productivo y Energético = Report of the Seminar-Workshop on Policies for the Regulation and Control of Air Pollution from Fixed Sources in the Production and Energy Sectors

Contiene antecedentes, asistencia y organización de los trabajos y resumen de las presentaciones de la reunión que tuvo como objetivo analizar los aspectos jurídicos, institucionales, económicos y tecnológicos de la política de descontaminación ambiental. Incluye lista de documentos presentados y de participantes.

Uma nova metodologia de projeto e controle para o inversor Boost (CSI) monofásico, para o aproveitamento de fontes alternativas e renováveis de energia elétrica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Statistical sources for the study of poverty and inequality

Includes bibliography

Ethnic poverty and social vulnerability data sources from the census of the United States and the American community survey

Includes bibliography

Plan regional de acción en materia de fuentes de energía nuevas y renovables = Regional plan of action on new and renewable sources of energy

Incluye Bibliografía

Proportions d'orphelins et mesure de la mortalite des adultes dans les populations traditionnelles d'apres la reconstitution des familles: sources, methodes et problemes

Inclut la bibliographie

Ejecución del Plan de Acción de Río de Janeiro para la Cooperación entre Países en Vías de Desarrollo en el Campo de las Fuentes de Energía Nuevas y Renovables" = Implementation of the "Rio de Janeiro Plan of Action for the Co-operation among Developing Countries in the Field of New and Renewable Sources of Energy""

Señala algunas actividades concretas que podrían iniciar los países en desarrollo para la cooperación en el campo de las fuentes de energía nuevas y renovables. Dichas actividades consisten en una serie de programas que, según su naturaleza, se clasifican en: a) programa de planificación energética, b) programa de desarrollo científico y tecnológico, y c) programas de apoyo comunes.

Report on the Consultative Meeting for the Promotion of Latin American and Caribbean Projects in the Area of New and Renewable Sources of Energy = Informe sobre la Reunión Consultiva para la Promoción de Proyectos de América Latina y el Caribe en la Esfera de las Fuentes de Energía Nuevas y Renovables

Informe de la reunion consultiva sobre promocion de proyectos de America Latina y el Caribe en el area de fuentes de energia nuevas y renovables. Contiene el resumen de los debates y conclusiones acerca del conjunto de proyectos presentados por OLADE y CARICOM.

Avaliação econômica do aproveitamento do biogás e biofertilizante produzido por biodigestão anaeróbia: estudo de caso em unidade biointegrada

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

United Nations Conference on New and Renewable Sources of Energy: information note

Informa acerca de las actividades efectuadas por el Comité Preparatorio de la Conferencia de las Naciones Unidas sobre Fuentes de Energía Nuevas y Renovables.