Thesis -- Memorial University of Newfoundland. / Includes reprints of three articles from Canadian journal of earth sciences. Bibliography : leaves 273-290. Also available online.

Thesis (M. Sc.)--University of Hong Kong, 2004. / Also available in print.

Thesis (Ph. D.)--Illinois State University, 1989. / Title from title page screen, viewed October 18, 2005. Dissertation Committee: Walker D. Wyman, Jr. (chair), Lawrence McBride, John Freed, Paul Holsinger, Don Davis, Dorothy Lee. Includes bibliographical references (leaves 265-272) and abstract. Also available in print.

Thesis (M.S.)--University of Missouri-Columbia, 2004. / 1 folded map in pocket. Typescript. Includes bibliographical references (leaves 134-145). Also available on the Internet.

Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2005. / Includes bibliographical references (leaves 188-198). Also available in electronic version.

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.

No description available.

From Introduction: The object of the investigation was to examine the variations in the granite and the relation between the granite and the surrounding metamorphosed sedimentary rocks of the Shamvaian System (Primitive). Although this object may not have been fully achieved, it has been possible to show that a wide variety of rocks is present in the area, and a few suggestions as to their origin have been made.

Abstract The gold mineralization event within Archaean granite-greenstone terranes occurred during the late Archaean, and followed the intrusion of syn- to late-tectonic granitic plutons into previously deformed greenstone belts. An Archaean granite/gneiss-hosted gold deposit, in terms of this project, is classified as having a gold-assay cutoff of 1g/metric ton over widths of at least several metres, or higher grades over narrower widths and/or verbal descriptions that indicate such values. Fluid inclusion studies and isotopic data identify two possible origins for the auriferous fluids; namely magmatic and metamorphic. The exploration target according to the magmatic model, is a late-Archaean, hydrothermally altered, mineralized and fractured granitic intrusion preferably with a granodioritic or quartz-dioritic composition. The exploration target according to the metamorphic replacement model is a granitic stock that has intruded a zone of crustal weakness such as a shear zone, active during the late Archaean. Alternatively, the granitic intrusion should be affected by regionally extensive late-Archaean shearing. It should be hydrothermally altered, deformed and mineralized. Five areas within the Pietersburg granite-greenstone terrane were selected for the 'Regional Area Selection' phase of exploration for Archaean granite/gneiss-hosted gold deposits; namely Roodepoort, Waterval, Ramagoep, Moletsie and Matlala. Roodepoort contains a known granodiorite-hosted gold deposit; the Knight's Pluton, and served as an orientation survey for this project. The use and interpretation of LANDSAT images formed an integral part of exploration techniques; to assess their usefulness in the exploration of Archaean granite/gneiss-hosted gold deposits. Area selection criteria for granite/gneiss-hosted gold mineralization at Roodepoort are the major ENE-trending shear zone, the NNW-trending lineament and hydrothermal alteration, shearing, quartz-stockworks and sulphide mineralization within the Knight's Pluton. The origin of the gold within the Knight's Pluton is uncertain; both magmatic and metamorphic models are possibilities. Ongoing exploration is in progress at Roodepoort. The only area selection criterion for granite/gneiss-hosted gold mineralization at Waterval is the sericitized, subcropping granites located within trenches. Gold mineralization is insignificant. No area selection criteria for Archaean granite/gneiss-hosted gold mineralization were located at Ramagoep, Matlala and Moletsie. No further exploration is recommended for all these areas. The MES image interpretations were successful in identifying lineaments, granitic outcrops, greenstones, vegetation and soil cover. The Clay-iron images adequately differentiated betweeen iron-rich and clay-bearing areas. However, not all clay-bearing areas were associated with hydrothermal alteratian; field checks were necessary to discriminate between weathered granites and hydrothermally altered granites. The Wallis images served to locally enhance the contrasts of the MES and Clay-iron images.

This thesis investigated the shock compression and fragmentation of ge- ological materials with application to blast mining. Two geological materi- als were investigated; Lake Quarry Granite and Gosford Sandstone. Lake Quarry Granite was fully dense, while Gosford Sandstone was porous. The composition and microstructure of the materials were quanti ed and this information was later used in the analysis of their mechanical properties. The elastic sound speeds were measured for each material, from which their elastic moduli were derived. Gosford Sandstone had a reduced sound speed compared to its component minerals, which was analysed using geometric grain models and Hertzian contact theory. The shock Hugoniot of each ma- terial was measured though a series of plate impact experiments using a light gas gun. The experiments focused on the stress region of interest for blast mining, 0 to 12 GPa. The, fully dense, Lake Quarry Granite was found to have a constant shock speed, which agreed with the elastic longitudinal sound speed measured previously. As the material remained elastic, its Hugoniot was shown to be predictable using composite theory and the chemical com- position. The, porous, Gosford Sandstone underwent shock compaction and resulted in large variations in shock speed. The Hugoniot of Gosford Sand- stone was found to remain partially porous, even to high stresses, and was analysed using a P-a shock compaction model. Explosively-driven expanding ring fragmentation experiments were performed on Lake Quarry Granite to observed its fracture response under loading similar to those in blast mining. The experiments established that the fragment size reduced with loading strain rate until it reached the grain size. After this point the fragment size remained constant with increasing strain rate, a phenomenon not previously observed. The rock was found to be dominated by intergranular fracture, so the minimum achievable fragment size was the size of the grains with this failure mechanism.