Thesis (doctoral)--Université de Paris III, 1977. / Includes indexes. Includes bibliographical references (v. 2, p. 895-995).

Thesis (Ph. D.)--University of Missouri-Columbia, 2007. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on October 17, 2007) Vita. Includes bibliographical references.

The Beattie syenite is composed of a series of lenticular bodies of syenitic rocks, situated immediately north of the Porcupine-Destor fault zone in the town of Duparquet, approximately 32 km north of Rouyn-Noranda in the Abitibi Subprovince. The principal body is 3.3 km long and 470 m in width and is flanked by a series of smaller lenses to the south and northeast. The intrusion has been zircon dated at 2682±1Ma and 2682.9±1.1 Ma and hosted the major part of the Au-mineralization of the now defunct Beattie mine, which was an important producer of gold in the area from 1933 to 1956 (9.66 Mt at 4.88 g/t Au). A total of 5 petrographic units are defined here, on the basis of field relationships, macroscopic textures, petrology and mineralogy: 1- The porphyritic Beattie syenite unit is composed of 2% to 10% of tabular sub- to anhedral feldspar phenocrysts about 2 mm to 10 mm in size, set in a red feldspathic and aphanitic matrix. This unit can be strongly cataclastic with abundant hydrothermal minerals. 2- The equigranular magnetite-bearing syenite unit includes few feldspar phenocrysts, about 2 mm to 10 mm in a fine-grained matrix. It is characterized by unaltered titanite, epidote, hornblende porphyroblasts and is the only unit with actinolite replacing clinopyroxene. 3- The porphyritic Central Duparquet syenite unit contains between 2% - 25% of coarse equant euhedral feldspar phenocrysts, about 5 mm to 16 mm in size, in a red or sometimes grey aphanitic matrix. 4- The megaporphyritic syenite unit is composed of very coarse alkali feldspar phenocrysts, typically 1 cm to 6 cm across, in a red aphanitic matrix. The phenocrysts often form a glomeroporphyritic texture. 5- The lath syenite unit occurs as numerous ~m-width thin dykes, which cross-cut all other petrographic units. These dykes display a characteristic trachytic texture, as defined by the preferential alignment of alkali feldspar laths, which are typically 1 cm to 3 cm in a grey or red aphanitic matrix. Petrology and geochemistry investigations revealed that the syenite intruded into the older 2720-2718 Ma volcanic Deguisier Formation and the <2687±2 Ma sediments of the Porcupine Group. Detailed geochemical analysis revealed that the Deguisier Formation is composed of three units, forming a complete tholeiitic suite. The Deguisier Formation is proposed here to have been produced in a volcanic arc setting. Detailed petrological, mineralogical and geochemical studies indicate that, the syenite is part of the alkaline series and is metaluminous to peraluminous. The syenite intruded at shallow depths through a sequence of injections, yielding the five comagmatic units. The syenite and country rocks were then subjected to a series of hydrothermal alterations and brittle deformation events, combined with metamorphism to the greenschist facies. The Au-mineralization in this region is attributed to the hydrothermal alteration with brittle deformation.

The Beattie syenite is composed of a series of lenticular bodies of syenitic rocks, situated immediately north of the Porcupine-Destor fault zone in the town of Duparquet, approximately 32 km north of Rouyn-Noranda in the Abitibi Subprovince. The principal body is 3.3 km long and 470 m in width and is flanked by a series of smaller lenses to the south and northeast. The intrusion has been zircon dated at 2682±1Ma and 2682.9±1.1 Ma and hosted the major part of the Au-mineralization of the now defunct Beattie mine, which was an important producer of gold in the area from 1933 to 1956 (9.66 Mt at 4.88 g/t Au). A total of 5 petrographic units are defined here, on the basis of field relationships, macroscopic textures, petrology and mineralogy: 1- The porphyritic Beattie syenite unit is composed of 2% to 10% of tabular sub- to anhedral feldspar phenocrysts about 2 mm to 10 mm in size, set in a red feldspathic and aphanitic matrix. This unit can be strongly cataclastic with abundant hydrothermal minerals. 2- The equigranular magnetite-bearing syenite unit includes few feldspar phenocrysts, about 2 mm to 10 mm in a fine-grained matrix. It is characterized by unaltered titanite, epidote, hornblende porphyroblasts and is the only unit with actinolite replacing clinopyroxene. 3- The porphyritic Central Duparquet syenite unit contains between 2% - 25% of coarse equant euhedral feldspar phenocrysts, about 5 mm to 16 mm in size, in a red or sometimes grey aphanitic matrix. 4- The megaporphyritic syenite unit is composed of very coarse alkali feldspar phenocrysts, typically 1 cm to 6 cm across, in a red aphanitic matrix. The phenocrysts often form a glomeroporphyritic texture. 5- The lath syenite unit occurs as numerous ~m-width thin dykes, which cross-cut all other petrographic units. These dykes display a characteristic trachytic texture, as defined by the preferential alignment of alkali feldspar laths, which are typically 1 cm to 3 cm in a grey or red aphanitic matrix. Petrology and geochemistry investigations revealed that the syenite intruded into the older 2720-2718 Ma volcanic Deguisier Formation and the <2687±2 Ma sediments of the Porcupine Group. Detailed geochemical analysis revealed that the Deguisier Formation is composed of three units, forming a complete tholeiitic suite. The Deguisier Formation is proposed here to have been produced in a volcanic arc setting. Detailed petrological, mineralogical and geochemical studies indicate that, the syenite is part of the alkaline series and is metaluminous to peraluminous. The syenite intruded at shallow depths through a sequence of injections, yielding the five comagmatic units. The syenite and country rocks were then subjected to a series of hydrothermal alterations and brittle deformation events, combined with metamorphism to the greenschist facies. The Au-mineralization in this region is attributed to the hydrothermal alteration with brittle deformation.

Le gisement de Beattie est situé dans la ceinture de roches vertes de l'Abitibi, à proximité de la faille Porcupine-Destor, et est associé à une syénite porphyrique. Les corps minéralisés ont une ressource totale inférée de 2,77Moz contenu dans 56,2Mt de minerai à 1,53g/t d'or. Dans le gisement de Beattie, deux styles de minéralisation sont présents, à contrôle lithologique et à contrôle structural. La minéralisation à contrôle lithologique est limitée exclusivement à la syénite altérée en carbonates de fer. Cette minéralisation représente du minerai à basse teneur mais fort tonnage, dans lequel l'or est porté par la pyrite arsénifère et l'arsénopyrite. L'or est « invisible »; il se présente sous la forme de solution-solide dans le cœur poreux et riche en arsenic des pyrites. La minéralisation à contrôle structural est présente uniquement dans des zones de cisaillement adjacentes et incluses dans la syénite. Le minerai est à haute teneur dans des zones de brèches silicifiées à caractère hydraulique et tectonique, dans des veines de quartz cherteux, dans des veines polymétalliques intensément silicifiées, et dans des dykes de syénite trachytique très altérée. L'or y est visible sous forme d'éléctrum dans les microfractures des pyrites bréchifiées. Les deux styles de minéralisation et les altérations font partie d'une évolution paragénetique commune dans un environnement magmatique-hydrothermal. Des phases initiales oxydantes ont évolué en conditions réduites à la faveur de fluides magmatiques et externes riches en CO2. Ce changement d'état d'oxydation a entraîné la précipitation des sulfures et la cristallisation de l'or « invisible » dans la pyrite arsénifère et l'arsénopyrite. Une phase d'altération ultérieure, dominée par des fluides hydrothermaux riches en silice, a pour résultat la bréchification des sulfures et leur redistribution dans des corridors siliceux, ainsi que la remobilisation de l'or dans les microfractures des pyrites bréchifiées. Les compositions calculées de δ18O et δD sur les veines de quartz associées à cet évènement tardif sont respectivement 7.67%o et -66%o, indiquant une dominance des fluides magmatiques avec une probable composante métamorphique. Cet évènement syn-métamorphique (transition D2-D3) est associé à un fort enrichissement en Hg, Te, Mo, Ag, Sb, As, et Se. Le style de cristallisation de l'or dans le gisement de Beattie est une conséquence de la dominance des régimes en systèmes ouverts, tant au niveau de l'incorporation dans le magma de l'arsenic qui contrôle la précipitation de l'or « invisible », que de la circulation tardive de fluides hydrothermaux riches en silice qui sont à l'origine de la remobilisation de l'or. Le gisement de Beattie partage des affinités avec des gisements associés aux intrusions (Intrusion Related Gold Deposit), des gisements épithermaux à tendance neutre à intermédiaire, et des gisements de type mésothermaux. ______________________________________________________________________________ MOTS-CLÉS DE L’AUTEUR : Gisement d'or, porphyre Archéen, or invisible, remobilisation de l'or

No description available.

This thesis has two aims. Firstly, in order to answer the question, ‘In what sense do people see Mary as a type of the Church?’, this thesis will set up original typological models of the relationship between Mary and the Church (chapter 1). It will then demonstrate how and why an eschatological element came to be present in these models (chapter 2).It will be a contention of this thesis that looking at the Mario-ecclesial discussions set out in chapters 3 and 4 through these typological models will allow a greater depth of analysis. The models allow one to discern differences between and nuances in various views of the relationship between Mary and the Church that would be impossible to discern if one were using just the language of ‘type’. Secondly the thesis will show how each Mario-ecclesial discussion has been affected by the socio-political context of the time. Specifically, the thesis will analyse the Mario-ecclesial discussions of the patristic, medieval and modern periods in the light of the typological models. In chapter 1, the patristic Mario-ecclesiologies of Irenaeus and Ambrose will be considered. In chapter 2, Bernard of Clairvaux will be used to analyse the eschatological nature of the Mario-ecclesiology in the medieval period. In chapter 3, the contrasting Mario-ecclesiologies of the Second Vatican Council and Hans Urs von Balthasar will be compared. In chapter 4, it will be suggested that John Paul’s model of the Mario-ecclesial relationship was based on his eschatological vision for the Church and the role that Mary plays in that future which is both imminent and already realised. This thesis will demonstrate that by using the typological models in these periods a greater depth of analysis can be achieved. This will be particularly true of the complex and nuanced discussions on Mary in the Roman Catholic Church in the twentieth century. This analysis will culminate in the particular Mariology of John Paul II.