<p> The northwestern Melville Peninsula in the area of 69°34'N/84°50'W consists of Precambrian Shield rocks that have suffered multiple metamorphic events, including a high grade metamorphic event in the late Archean, ranging from upper amphibolite to granulite grade locally. The oldest unit present is a tonalite-granodiorite-granite suite showing both foliation and lineation and a somewhat migmatic texture. This biotite-hornblende orthogneiss has produced a Rb-Sr whole rock age date of 2.55 +/- 0.2 Ga. Field relationships indicate that this is a metamorphically induced age rather than an emplacement age. A coarse grained granitic pegmatite associated with the orthogneiss has produced a Rb-Sr isochron indicating an age of 1.83 +/- 0.06 Ga. Petrographic and field evidence indicate that this represents the emplacement age of the pegmatite. </p> / Thesis / Bachelor of Science (BSc)

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No description available.

The low ambient air temperatures, together with the low annual rainfall and complete lack of vegetation in the Canadian High Arctic, results in a breakdown of the carbonate rock material by mechanical means. The importance of chemical decomposition, soil formation and transport of ionic material in solution is negligible, when compared with the role played by these same processes in more temperate climates. The purpose of this thesis is to investigate certain aspects of the alkali, alkaline earth and heavy metal geochemistry of selected components of the weathering cycle. The discussion will deal with concentration levels of these parameters in stream waters and, to a lesser extent, soils and stream sediments. Analytical results show that element distributions in the streams resemble those of more temperate carbonate terrains. However, the solute levels are, in general, lower, indicating that a greater proportion of the metals is travelling in colloidal form and/or adsorbed to siltsized material carried by the streams. These findings confirm the belief that chemical weathering and transport in solution are of little importance in the area studied. / Thesis / Master of Science (MSc)

Organoarsenic compounds and trace elements are added to poultry feed for disease control and improved productivity. These elements are excreted into poultry litter, which is land applied as fertilizer. This study utilized field and laboratory experiments to address the mobility of arsenic (As) and other litter-derived elements within the Broadkill River watershed, DE, a region of intense poultry production. For the first project, a litter application experiment was conducted at an instrumented field site in Sussex Co., DE. After establishing baseline geochemistry of soil water, ground water, and surface water at the site, poultry litter was then applied, followed by post litter application monitoring. Results showed low concentrations of As and other litter-derived elements in soil water; little impact was measured on ground or surface water. Mass balance calculations suggest that the majority of mass of leached elements was accounted for by uptake in underlying soils. The second project examined the impact of long-term litter application on chemical signatures of As, copper (Cu), zinc (Zn) and phosphorous (P) in stream sediments within the Broadkill River watershed. Sediment samples were collected from both upgradient and downgradient reaches within the watershed. Using GIS to overlay hydrology and land use, statistical relationships between As, Cu, Zn and P enrichment factors and land use were examined. Results did not show a relationship between these elements and agricultural land use, but did show a correlation between some of the elements and residential land use. The third project examined the influence of dissolved organic carbon (DOC) on the mobility of As, Cu, Zn and P using laboratory column experiments with soil from the field site. Two influent solutions were used: poultry litter leachate and a simulated solution of similar element concentrations, pH, and ionic strength but without DOC. Results showed that DOC enhanced the mobility of all four elements, but that even with DOC, 60-70% of the Zn, As and P mass was retained within the soil. Cu was fully mobilized by DOC. Patterns of breakthrough curves (BTCs) and mass calculations suggest that the behavior of these litter-derived elements in the column is controlled by both adsorption (including competitive) to soils and complexation with DOC. / Ph. D.

Thesis (MA) -- Stellenbosch University, 1966. / ENGLISH ABSTRACT: no abstract available / AFRIKAANSE OPSOMMING: geen opsomming

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No description available.

Eskimo peoples residing along the Bering Strait region of western Alaska and Soviet Chukotka were forcibly separated by the closing of the US-USSR border in 1948. As a result, all communications between these peoples ceased for a period of 40 years. Eskimos on each side were divided into separate streams of Soviet and American jurisdiction, and with the further development of both regions following the second world War, these people became the recipients of new broadcast services. These services, conceptualized and developed from completely differing philosophies concerning the nature, function, and operation of the press, brought Eskimos into the information and societal orbit of the respective nations, though with little opportunity to control the systems implemented on their behalf. / Broadcasting in Chukotka developed in blue print fashion according to central planning directives of the Communist Party, based on an authoritarian, Marxist/Leninist-based model which held a complete monopoly on the means of mass information, in effect, stifling the free exchange of ideas in its attempt to convince Eskimos to accomplish objectives formulated by the Party. Broadcasting in Alaska developed in an opposite fashion, from a combination of state-supported and private initiative based on libertarian/social responsibility models of the press. Alaskan broadcasting was formulated more from the perspective of providing information and entertainment, while radio in Chukotka was more serious in nature, concentrating primarily on political and socio-economic issues facing the region and nation. / As the Cold War between the US and USSR intensified from the 1950s through the early 1980s, communication across the Bering Strait was forceably restricted, yet Eskimos could receive radio services from the other side. While Alaskan stations sought accurate information about the conditions of Eskimos in the USSR, Soviet broadcasting sought to issue a slanted, propagandistic account of the lives of Alaskan Eskimos, despite their lack of accurate reporting resources, in order to convince Soviet Eskimos of the superiority of their lives in contrast to the Alaskans. / This investigation will provide an overview of the development of broadcast media in both regions, as well as a comparative analysis on the role and operation of broadcasting along the Bering Strait, and the participation by Eskimos with such media. / With the development of Soviet glasnost and perestroika in 1985, new opportunities arose for the reunification of the Eskimo people, and broadcasting from both sides played a role in the overall decision-making process between the Soviet and American governments to reopen the border. This study provides a historical synopsis of the border closing and reopening, and the role of broadcast media in these events. Further, developments in the changing nature of mass communications and the reorganization of broadcast media in the Russian Republic will be explored. / The study concludes with an assessment on the possibilities for Eskimo control of broadcasting in the overall effort to strengthen the process of societal reintegration and national development of these people living along the Bering Strait.

No description available.