Submitted by Irene Nascimento (irene.kessia@ufpe.br) on 2017-03-23T18:49:28Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação Mickey Paixão.pdf: 4062224 bytes, checksum: 47b4af597c13bbbf32f479aa0e076a4a (MD5) / Made available in DSpace on 2017-03-23T18:49:28Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação Mickey Paixão.pdf: 4062224 bytes, checksum: 47b4af597c13bbbf32f479aa0e076a4a (MD5) Previous issue date: 2016-08-09 / Em virtude dos agregados constituírem os recursos minerais mais acessíveis e também serem responsáveis por uma enorme parcela do material consumido na construção civil, faz-se necessário um estudo mais aprofundado a respeito da utilização e aplicação dessa matéria prima. O objetivo principal é qualificar a relação entre os resultados de resistências à compressão do concreto, obtidos por meio de testes feitos em corpos-de-prova moldados com diferentes tipos de brita, de modo a identificar aquela que proporciona uma maior resistência no mesmo, quando submetido aos esforços uniaxiais de compressão. Para isso foram escolhidas amostras de rochas, sendo três granitos e três gnaisses para análise da qualidade do concreto produzido a partir das respectivas britas. As britas foram analisadas macroscopicamente e todas as amostras foram submetidas às mesmas etapas de britagem, e posteriormente o material resultante dessa etapa passou pelo peneirador mecânico. Através desse processo, avaliou-se individualmente o índice de forma, o módulo de finura e o percentual dos minerais com clivagem dos devidos tipos de rochas afim de entender melhor o motivo dos posteriores resultados do comportamento do concreto com relação à trabalhabilidade e resistência a compressão uniaxial para cada um dos tipos de brita. A escolha do tipo de cimento torna-se muito relevante para esta análise. Faz-se necessário a escolha de um cimento que dê margem para que o tipo de brita seja a variável mais importante e decisiva no processo de resistência. Observa-se também que o índice de forma está relacionado ao percentual de minerais presentes na rocha que apresentam planos de clivagem. O valor do índice de forma está diretamente relacionado aos teores de minerais com um ou mais planos de clivagem contidos em cada amostra. Por fim, ficou constatado que o concreto que apresentou a maior resistência à compressão foi confeccionado por agregados com os menores módulos de finura; já os agregados com o maior módulo de finura resultaram num dos concretos menos resistentes. / Because the aggregate constitute the most accessible mineral resources and also account for a huge portion of the consumed in construction material, it is necessary to further study regarding the use and application of this raw material. The main goal is to qualify the relationship between the results of resistance to the concrete compressive obtained by means of tests made on specimens test pieces molded with different types of gravel, in order to identify one that provides greater strength in that when subjected to uniaxial compression efforts. For this rock samples were selected: three and three granite gneiss for analysis of the quality of concrete produced from the respective gravel. The gravel was analyzed macroscopically and all samples were subjected to the same steps of crushing, and then the resulting material has passed this stage by mechanical sieving. Through this process, we assessed individually the form of an index, the fineness modulus and percentage of minerals with cleavage of proper rock types in order to better understand the reason for the subsequent behavior of concrete results regarding the workability and compressive strength uniaxial for each type of grit. The choice of the type of cement becomes very relevant to this analysis. It is necessary to choose a cement margin so that the type of grit is most important and crucial variable in resistance process. It is also observed that the form of an index is related to the percentage of minerals present in the rock show cleavage planes. The value of the medium index is directly related to mineral contents in one or more cleavage planes contained in each sample. Finally, it was found that the concrete with the highest compressive strength was made by households with the lowest fineness modules; since aggregates with higher fineness modulus resulted in the least resistant concrete.

This research focused on the petrographic analysis of prehistoric ceramics within the East Midlands. Prior assessments have been intermittent and not drawn together by a research-based agenda, with a few notable exceptions. This research uses petrographic analysis to shed light on early prehistoric society within Leicestershire, a county overlooked in comparison to other regions. The aim of this research was to investigate the procurement of raw materials and the subsequent production of Neolithic and early Bronze Age ceramics in Leicestershire, placing the county in its regional context. Petrographic slides from several early prehistoric sites were produced and analysed to determine the presence of any non-local material within the fabric of the ceramics. Existing petrographic data from other sites in the East Midlands were used as a comparative data set to test whether the ceramics from Leicestershire were typical or atypical of the wider production and procurement pattern. The results of the petrographic analysis on the Leicestershire sites indicated that the clay and inclusions were most likely of local origin, with no definitive evidence for non-local inclusions. However, the results from the comparative petrographic data obtained from sites within the wider East Midlands does support the movement of raw materials and/or finished ceramic products within the region. Preferential sources appear to have been continually exploited, both chronologically and geographically. The prime target of the exploitation was the Charnwood Forest area of Leicestershire, with groups from Derbyshire and Nottinghamshire utilising this resource in addition to more local groups within Leicestershire.

<p> The aureole surrounding the Loon Lake pluton, notable for the presence of scapolite, is situated in an upper amphibolite facies terrane in the Grenville Province of southern Ontario. Four distinct scapolite-bearing parageneses are found to surround the pluton in more or less concentric zones. Furthest from the pluton a clinopyroxene-scapolite gneiss grades into Ca-amphibole gneiss, Ca-amphibole-biotite gneiss and biotite gneiss. Scapolite is also found in the marbles surrounding the aureole, as well as in all gneisses of the aureole. As the mineralogy of the gneisses change from clinopyroxene through biotite, the textures grade from granoblastic polygonal to a granoblastic polygonal texture modified by abundant acicular and platy minerals. </p> <p> As the pluton is approached, scapolite often assumes a ragged fine-grained nature with alteration to sericite. The whole rock chemistry is characteristic of that derived from a mixture of intermediate volcanics (latite) and carbonate-evaporites. This sequence was undoubtedly deposited in a shallow marine environment. Subsequent metamorphism to upper amphibolite facies produced a band of clinopyroxene gneiss. As the Loon Lake pluton was emplaced increasing temperature and volatiles in an aqueous solution caused the clinopyroxene-scapolite gneiss to undergo retrograde metamorphism and formed the Ca-amphibole, Ca-amphibole-biotite and biotite gneisses. </p> <p> Studies of mineral chemistry indicate that the minerals coexist in equilibrium and that they are related, to some degree, to whole rock composition. As the retrograde metamorphsim occurred elements within the minerals redistributed themselves according to the nature of the new phases produced. Finally, the partitioning between phases followed the ideal binary solution model. Chlorine is found to be partitioned between scapolite, Ca-amphibole and biotite, and all three phases contain chlorine, the relative amounts present being controlled by the crystal structure of the minerals. The relation of Lin and Burley (1973a) between lattice parameter and scapolite composition is confirmed. </p> / Thesis / Master of Science (MSc)

<p> The process of vapour fractionation during impact fusion of country rocks is discussed in relation to absolute loss and relative loss. The factors which determine the amount of vapour fractionation are considered in an equilibrium thermodynamic model. The model is tested upon the relative vapour fractionation of Rb with respect to K. Application of the model to crater studies leads to sampling concepts and the statistical validity of differences in measured compositions of melt rock and adjacent country rocks.</p> <p> The petrography and K/Rb ratios of twelve samples of melt phases in the Onaping formation, Sudbury, Ontario are presented. The data is discussed in the light of theoretical model for vapour fractionation.</p> / Thesis / Bachelor of Science (BSc)

<p> A gabbroic intrusion within the Wabigoon Greenstone Belt, southeast of Dryden Ontario, was studied and mapped. Petrographic examination of the sill was carried out and geochemical whole rock data was obtained using X.R.F. methods. </p> The Gabbro Lake Sill was injected into a mafic pile and subsequently underwent fractional crystallization and differentiation. The sill exhibits good phase layering resulting in its division into six basic units: Chilled Margin Gabbro Diabasic Gabbro Leucocratic Gabbro Pyroxenitic Gabbro Pegmatitic Gabbro Sheared Gabbro </p> <p> These units are evident in thin section and are distinguishable both modally and textUrally. In most cases, variations in the chemistry and norms reflect the units mapped in the field. </p> <p> Many features of the sill are analogous to other intrusions, and comparisons have been drawn and theories incorporated to explain these features in the Gabbro Lake Sill. </p> / Thesis / Bachelor of Science (BSc)

Detailed petrography, geochemistry, and palynology together describe the depositional environments and paleoecology of an abandoned meander-fill system in western Kentucky. Oriented block petrography reveals alternating clay-rich and attrinite-rich zones of variable thickness. Woody tissues, where present, do not show dessication features and deflation layers could not be identified. Overall, petrography is indicative of a topogenous mire. Mire palyno-assemblages are less diverse than assemblages reported from clays in the region. Castanea-Cupuliferoidaepollenites assemblages dominate the entire system and other tree pollen are common; fungal spores are relatively uncommon. Weighted statistical analyses reveal ecological groupings beyond this dominance and define botanical succession within the mire. The nearestliving- relative method for determining paleoclimate indicates temperate to warm temperate conditions during deposition. Palynology indicates a Claibornian stage, middle Eocene age for the deposit.

Ce travail aborde l'étude des laves spilitiques du massif du Pelvoux ( Alpes françaises) à partir de la description de quelques gisements : - Rochail Grand Renaud - Grand Clot - Pic vert- têtes des Chétives - Rocher de palets-Neyrarel - Rocheray.

Ce travail est conscré à : - la description des grands ensembles géologiques ; schistes lustrés de la vallée de l'Arc et de l'Orco, la "coupole" du Grand paradis, le massif de sesia lanzo - la description pétrographique des schistes lustrés et autres roches : gneiss de sparone, micaschistes de Cuorgne, migmatites du Grand Paradis, - à l'histoire géologique de la région étudiée

Given the long history of research within the Aegean, the Middle Bronze Age (MBA) of the Cyclades is surprisingly poorly understood. This region is often considered within the context of other ‘worlds’, particularly in the quest to understand ‘Minoanisation’. Prominent Middle Cycladic sites such as Ayia Irini (Kea), Phylakopi (Melos) and Akrotiri (Thera) have played a dominant role towards informing the perceived Cycladic ‘response’ to growing Minoan influence within the Aegean sphere, often at the expense of considering the interactions between these important settlements. However, the recent 2000-2001 pillar pit excavations at Akrotiri have allowed a whole new phasing for the MBA ceramic deposits and offer great potential for characterising these neglected interactions. The ceramic material studied here, from Phases B and C of the MBA assemblage at Akrotiri, corresponds to the introduction of imported and ‘Minoanised’ material traits, both compositional and technological, to the local ceramic repertoire. This material is contextualised within previous research in the Cyclades, including Phylakopi, Ayia Irini and Mikre Vigla. Scale is considered an important theme and provides a key structure throughout this thesis. Three scales were defined for considering all aspects of the ceramic assemblage at Akrotiri: a) the potters at Akrotiri, the technological choices they make, the social practices they participate in and perpetuate and the character of the local ceramic production sequence (the micro-scale of individuals); b) the character and significance of the Akrotiri ceramic assemblage within the Cyclades (the meso-scale of group interaction); c) the role that Akrotiri played as a node within larger social and exchange networks throughout the Aegean (the macro-scale of community interactions). From a theoretical standpoint, four explanatory frameworks are employed to tackle and integrate these various scales: the chaîne opératoire, dynamic systems framework, network theory and communities of practice. In combination, these frameworks have the potential to bridge the structure-agency divide, by acknowledging the fundamentally social nature of artefact production and consumption, and to integrate recent considerations of human and non-human agency within dynamic processes. Ultimately, by considering the socially constituted processes that drive the learning and practice of a craft or technique, and how these processes contribute to and perpetuate communities of practice, archaeologists can begin to meaningfully characterise the contact between different groups of people in the past. Therefore, this technological study of the late Middle Cycladic ceramic assemblage of Akrotiri, integrates macroscopic, petrographic and QEMSCAN analyses to characterise and explore the interactions within and between the many communities of practice operating within the late MBA Cyclades. In addition, this methodology allows a better understanding of the choices the communities in the Cyclades were making in the lead up to ‘Minoanisation’ so we can approach these material phenomena from a more localised, site-based perspective rather than a traditional Creto-centric viewpoint.

This study digs beneath the cultural façade of pottery, delving deeper into the individual consciousness and choices behind the selection of the clays used to make them. The social significance of clay and its sourcing practices is rarely considered in ceramic studies, and is generally restricted to an assessment of technical properties. This subject is thus poorly theorised, ignoring the potential of that first choice and act in the social process of ceramic production. This thesis sets out a theoretical approach – raw-material spatialisation – and utilises a ceramic petrographic methodology designed to investigate social change through the changing composition of ceramic fabrics. The study focuses on the continuous pottery sequence spanning the 4th-11th century AD in Cornwall, a period of immense social, religious and political change, viewed in its regional and national context. The first synthesis of ceramic traditions in the South West for 50 years, this study highlights previously overlooked similarities in the phases of ceramic innovation and production between Cornwall and western Wessex and the role of Devon as an aceramic buffer zone. Previous studies have highlighted the selection and preference of gabbroic clays, unique to the Lizard Peninsula, used in the production of pottery in Cornwall since the start of Neolithic and which became a tradition that lasted roughly 5000 years. Interpretation has rarely moved beyond David Peacock’s original assumption of the technical superiority of this material. This study challenges and overturns that assumption, establishing that social choice was the motivating factor in its procurement. The repeated use of gabbroic clay created and maintained a shared social reality within the socialised landscape occupied by the past peoples of Cornwall. Gabbroic clay had a totemic meaning within society: its source became a node in the socialised landscape; and its repeated extraction and distribution maintained not only society but regional kinship networks and their identities. The shift away from the exploitation of this totemic material towards clays sourced locally to settlements around the 7th-8th century coincides with the growing influence of Christianity in Cornwall. One of the early monastic foundations was strategically placed at its socially significant gabbro source eventually eroding its totemic meaning. The end of the gabbroic tradition and the region’s resilient decentralised system of pottery production came with the Norman Conquest, when the creation of a new market centres, networks and systems of landownership forcibly integrated Cornwall into the wider national framework once more. This study conclusively demonstrates that the selection of a clay source should be interpreted as an indicator of social, and not merely technical or economic, choice. It also establishes that the use of a rigorous and systematic programme of scientific inquiry, combined with an informed theoretical perspective, can identify the evidence for social change behind the façade of the otherwise largely static pottery traditions of the 5th-11th centuries AD in most parts of the British Isles.