Thesis (M.Sc.)--York University, 2005. Graduate Programme in Geography. / Typescript. Includes bibliographical references (leaves 128-133). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url%5Fver=Z39.88-2004&res%5Fdat=xri:pqdiss &rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR11877

The St. Lawrence Platform (SLP) and Humber Zone (HZ) of the southern Quebec Appalachians has historically been explored as a potential hydrocarbon reservoir. Extensive vitrinite reflectance studies on the basin resolved the degree of thermal maturation yet the timing of the thermal maximum is not well undertood. Determining the timing of such low temperature events can allow for a better understanding of the shallow crustal processes that may have allowed for the generation and entrapment of oil and gas. We have employed apatite (AHe) and zircon (ZHe) (U-Th)/He thermochronmetry across a network of late Cambrian to late Ordovician siliciclastic and Grenvillian basement samples in order to resolve the history within the ~210-35°C window. Single crustal dates from individual samples show age dispersion by as much as 300 m.y. with a strong positive to negative correlation with increasing eU concentration. A similar positive correlation can be observed when significant intra-sample grain size variation is present. AHe and ZHe data in the southwestern portion of the basin, near Montreal, allow for thermal maxima of up to 200°C to occur either during the late Ordovician, as a result of the Taconic orogeny, or from the continued sedimentation into the Devonian as a result of the Acadian orogeny. Regional burial trends deduced from these thermal maxima along with local paleo-geothermal gradients indicate that if sedimentation continued after the late Ordovician there was no significant increase in burial in southwestern portion of the SLP as previously suggested. Maximum heating is followed by a protracted cooling through the ZHe partial retention zone (PRZ) into the late Jurassic and early Cretaceous where the cooling rate increases by an order of magnitude through the AHe PRZ until ca. 100 Ma. The timing of this accelerated cooling is coeval with the passage of the Great Meteor Hot Spot across the area; the cooling may be a result of increased erosion from thermal uplift. Within the HZ, both the external and internal sections experienced rapid cooling through the Silurian after the Taconic thermal maximum. The timing of relatively rapid cooling coincides with documented normal faulting and back-thrusting in the orogen, which is the likely cause of exhumation. The HZ witnessed protracted cooling through the late Jurassic, when there is a one order of magnitude increase in cooling rate until surface conditions are attained. Increased recognition of these low temperature events has augmented our understanding of the evolution of accretionary orogens and consequently reduces the risks associated with oil and gas exploration.

Le complexe de Bay of Islands (BOI), situé sur la côte ouest de Terre-Neuve au Canada, est l'un des systèmes de subduction fossiles les mieux préservés de la planète. Le complexe de BOI est constitué de matériel allochtone mis en place sur le continent Laurentia lors de la phase Taconienne de l'orogénèse Appalachienne. Il se compose d'une ophiolite reposant sur une semelle métamorphique. La semelle métamorphique de BOI comprend, du sommet vers la base, des granulites à grenat et clinopyroxène, des amphibolites à grenat et clinopyroxène, des amphibolites communes et des roches métasédimentaires. Deux types de protolithes peuvent être distingués parmi la portion mafique de la semelle : des protolithes cumulatifs gabbroïques avec des Mg# élevés et des compositions appauvris en éléments traces ainsi que des protolithes basaltiques avec des contenus en éléments traces similaires à des N-MORB. La datation de titanite provenant de deux amphibolites communes permet de fixer un âge minimum pour le métamorphisme à 485 ± 4 Ma. Les données détritiques U-Pb sur zircon de la partie métasédimentaire de la semelle de BOI forment un spectre d'âges allant de l'Archéen à l'Ordovicien dominé par la population la plus jeune dont le pic se situe à c. 490 Ma. Ce pic est interprété comme l'âge maximal de déposition des sédiments. L'origine de ces jeunes détritus peut être attribuée au magmatisme associé à l'orogénie Taconienne. Les données obtenues indiquent que 1) l'initiation de la subduction responsable de la formation du complexe de BOI s'est produite dans le domaine océanique possiblement à une faille de détachement avant c. 485 Ma et 2) les sédiments constituant la partie métasédimentaire de la semelle proviennent de la plaque supérieure et se sont déposés sur la plaque inférieure lorsque la subduction était déjà en cours.

Thesis (Ph. D.)--University of Toronto, 2005.

Neoproterozoic-Early Cambrian continental rifting related to the breakup of the supercontinent Rodinia framed the continental margin of eastern Laurentia and the departing cratons around the opening Iapetus Ocean. The result of continental extension was the production of a zig-zag set of promontories and embayments on the eastern Laurentian margin defined by northeast-trending rift segments offset by northwesttrending transform faults. The St. Lawrence promontory defines the Laurentian margin in western Newfoundland. There, Neoproterozoic-Carboniferous clastic, volcanic, and carbonate successions record protracted continental rifting and passive-margin thermal subsidence followed by destruction of the margin during the early, middle, and late Paleozoic Appalachian orogenic cycles. Palinspastic restoration of deformed Paleozoic strata by a set of balanced cross sections resolves the structure, stratigraphy, and timing of Paleozoic tectonic events on the St. Lawrence promontory. Synrift and post-rift subsidence profiles, as well as abrupt along-strike variations in the age, thickness, facies, and the palinspastically restored extent of synrift and post-rift stratigraphy, indicate the St. Lawrence promontory was founded upon a low-angle detachment rift system. Upperplate margins, lower-plate margins, and transform faults that bound zones of oppositely dipping low-angle detachments are recognized along specific segments of the promontory. A detailed U-Pb and Lu-Hf isotopic detrital zircon study elucidates the identity of specific cratons conjugate to the St. Lawrence promontory in the pre-rift configuration of Rodinia. Approximately 510 zircons from 9 samples collected from basement and overlying Early Cambrian synrift rocks in Newfoundland were analyzed by LA-ICP-MS for U-Pb ages and Hf isotopic ratios. Synrift samples yielded ages ranging from 3605 Ma to 544 Ma with maximum age frequencies of 1000-1200 Ma (Grenville), 1350-1450 Ma (Pinware), and 2650-2800 Ma (Superior), while two basement samples yielded U-Pb ages of 1044 Ma and 1495 Ma. 177Hf/176Hf isotopic ratios of ca.1000 Ma, 1200 Ma, and 1400- 1600 Ma zircons from Newfoundland basement and synrift rocks are a close match to reported 177Hf/176Hf ratios for Baltican zircons of the same vintage, suggesting that Baltica was conjugate to the St. Lawrence promontory.

In an attempt to discern the prevalence of British place-names with a Scandinavian origin this paper is a small linguistic study on place-names in Herefordshire, Cumbria and the areas along rivers Trent and Ouse. Based on modern maps place-names were included in the study. Older forms of the place-names were retrieved, and these old forms were analysed in order to understand the modern versions of the place-names. Place-name elements were grouped and their frequencies calculated in an attempt to understand the distribution of elements in each area. 1300 place-names were categorised based on their presumed origin, though some lacked the necessary information. Several place-names were given new possible derivations based on their categorisation and the elements they contained. Modern place-name elements/features hinting at a possibly Scandinavian place-name in the past were identified and described. Possible geographical patterns of Scandinavian place-names were found in central Herefordshire, in south-eastern Cumbria and in north-western Yorkshire. Possible implications of the place-names and their geographical concentrations were considered, yielding a hint on an area that might have been pivotal in the evolution of Old English. / I ett försök att urskilja utbredningen av brittiska ortnamn med ett skandinaviskt ursprung är denna uppsats en liten språkvetenskaplig studie av ortnamn i Herefordshire, Cumbria och längs floderna Trent och Ouse. Utifrån moderna kartor i en viss upplösning inkluderades alla synliga ortnamn i områdena. Äldre versioner av ortnamnen samlades in, och dessa gamla former analyserades i syfte att undersöka bakgrunden till de moderna ortnamnsvarianterna. Ortnamnens delar grupperades och deras frekvenser beräknades i syfte att förstå hur dessa fördelades i de olika områdena. 1300 ortnamn kategoriserades utifrån deras förmodade ursprung, men några ortnamn saknade den nödvändiga information undersökningen krävde. Flera ortnamn fick nya tänkbara betydelser baserat på den kategori de tilldelats och de ortnamnsdelar de innehöll. Moderna ortnamnsdelar som skulle kunna indikera en forntida nordisk ortnamnsvariant identifierades och beskrevs. Tänkbara geografiska nordiska ortnamnsmönster upptäcktes i centrala Herefordshire, i sydöstra Cumbria och i nordvästra Yorkshire. Tänkbara implikationer av ortnamnen och deras geografiska koncentrationer betraktades, vilket resulterade i upptäckten av ett område som kan ha påverkat fornengelskans utveckling i väldigt hög utsträckning.

In this dissertation I examine arguments for teaching post-secondary violin students to be versatile musicians rather than specialists in one genre or area of music. In order to do this, I assess the professional and educational opportunities in Toronto based on interviews with nine professional violinists as well as teachers and administrators at four institutions that offer post-secondary instruction in violin performance. To supplement information gathered through interviews, violinists and violists performing with the National Ballet of Canada and the Esprit Orchestra were asked to respond to a questionnaire regarding their training and work experiences. Data collected through fieldwork is contextualized by an analysis of scholarly writing, periodicals and websites on the topic of current post-secondary music curriculum and pedagogy methods. Throughout the dissertation, I build the case that, despite strong opinions and many years of pedagogy that emphasize the contrary, versatility provides many advantages to professional violinists when compared to specialization. In order to maximize the benefits of versatility in a professional career, I draw on Benjamin Brinner’s notion of core competences (Brinner 1995) to posit the skills necessary for professional musicians to pursue successful, enduring careers in Toronto. Applying these core competences to an analysis of violinists’ training, I explore the violin curriculum of post-secondary music schools in Toronto: The University of Toronto, the Glenn Gould School, Humber College, and York University to examine how students are being trained. In particular, I query how students are being prepared to be profession violinists with a focus on whetherthey are being prepared to be versatile musicians or specialists in one style. I conclude by offering recommendations as to how to better teach versatility based on the findings of the previous chapters. I explain that versatility can be nurtured in the school environment through teacher training and curricular changes that emphasize informal learning approaches, shifts in conventionally held assumptions about musical value and career success, and by encouraging exploration and improvisation as a basis of developing creativity.

In this dissertation I examine arguments for teaching post-secondary violin students to be versatile musicians rather than specialists in one genre or area of music. In order to do this, I assess the professional and educational opportunities in Toronto based on interviews with nine professional violinists as well as teachers and administrators at four institutions that offer post-secondary instruction in violin performance. To supplement information gathered through interviews, violinists and violists performing with the National Ballet of Canada and the Esprit Orchestra were asked to respond to a questionnaire regarding their training and work experiences. Data collected through fieldwork is contextualized by an analysis of scholarly writing, periodicals and websites on the topic of current post-secondary music curriculum and pedagogy methods. Throughout the dissertation, I build the case that, despite strong opinions and many years of pedagogy that emphasize the contrary, versatility provides many advantages to professional violinists when compared to specialization. In order to maximize the benefits of versatility in a professional career, I draw on Benjamin Brinner’s notion of core competences (Brinner 1995) to posit the skills necessary for professional musicians to pursue successful, enduring careers in Toronto. Applying these core competences to an analysis of violinists’ training, I explore the violin curriculum of post-secondary music schools in Toronto: The University of Toronto, the Glenn Gould School, Humber College, and York University to examine how students are being trained. In particular, I query how students are being prepared to be profession violinists with a focus on whetherthey are being prepared to be versatile musicians or specialists in one style. I conclude by offering recommendations as to how to better teach versatility based on the findings of the previous chapters. I explain that versatility can be nurtured in the school environment through teacher training and curricular changes that emphasize informal learning approaches, shifts in conventionally held assumptions about musical value and career success, and by encouraging exploration and improvisation as a basis of developing creativity.