49 resultados para Linear Series
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In the Lusitanian Basin (Central Portugal), the Middle-Upper Liassic series are characterized by an expressive marly limestone accumulation, sediments that were deposited on a homoclinal carbonate ramp. These series belong to the Vale das Fontes, Lemede, S. Gião (and the lateral equivalents Prado and Cabo Carvoeiro Formations) and, partially, to the Póvoa da Lomba Formations. These units, in great part controlled by an accurate ammonite biostratigraphic scale, are organized into two secondorder transgressive-regressive sequences. The first one (SP) is dated of early Pliensbachian/lowermost early Toarcian age; the second (ST) is dated of early Toarcian to early Aalenian.
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With an example taken from a late-Hauterivian series of the Lusitanian Basin (Portugal), we will demonstrate the sedimentary record of orbital pattern variations and, consequently, climate variations in an inner platform environment with patterns and isolation changes, allows us to establish 4 major orders of periodicity related to orbital components:- The large cycles ob bed thickness variation, constituted by 31-32 beds, recording the 400 ky eccentricity cycle component;- The medium cycles, represented by byndles of 8-9 beds, related to the 100 ky eccentricity cycle component; - The small cycles, of 3-5 beds, recording the 41 ky obliquity components;- The very small cycles, of 2 beds, related to the 22 ky and 26 ky precession components. The mean duration of each bed is around 11.8 ky, a number very close to that of the precession hemi-cycle. Climatic control on qualitative production is confirmed by the close relation between the bed thickness variations, the insolation variability and the variation of micritized elements concentrations.
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Thesis submitted in the fulfillment of the requirements for the Degree of Master in Biomedical Engineering
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Dissertação para obtenção do grau de Mestre em Engenharia Civil
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Dissertação para obtenção do Grau de Mestre em Engenharia Civil - Perfil Estruturas
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Dissertação para obtenção do Grau de Mestre em Engenharia Electrotécnica e de Computadores
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Dissertação para obtenção do Grau de Mestre em Engenharia Electrotécnica e de Computadores
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Dissertação para obtenção do Grau de Mestre em Engenharia Electrotécnica e Computadores
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Dissertação para obtenção do Grau de Mestre em Engenharia Mecânica
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Dissertação para a obtenção do grau de Mestre em Engenharia Mecânica
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Dissertação apresentada à Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Doutor em Engenharia Civil
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Dissertação para obtenção do Grau de Mestre em Energias Renováveis – Conversão Elétrica e Utilização Sustentável
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Dissertação para obtenção do Grau de Mestre em Engenharia Mecânica
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Dissertation submitted in the fufillment of the requirements for the Degree of Master in Biomedical Engineering
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Dissertação para obtenção do Grau de Mestre em Engenharia de Materiais