As ocorrências estudadas da Sequência da Serra da Boa Vista (SSBV) balizam a borda leste do Quadrilátero Ferrífero nos distritos Santa Rita Durão, Bento Rodrigues e Camargos, da cidade de Mariana até a norte de Catas Altas. Sua geologia e as mineralizações de ouro foram enfocados nessa pesquisa baseada em mapeamento 1:25.000, levantamentos estratigráficos detalhados, estudos mineralógico-petrográficos, litogeoquímicos multielementares e das mineralizações auríferas e de morfologia e microgeoquímica de grãos de ouro e minerais associados via MEV-EDS, visando-se a evolução precambriana e a metalogênese do ouro da SSBV, bem como suas relações com as demais rochas da área, principalmente dos supergrupos Minas e Espinhaço. A área compreende um embasamento arqueano granito-gnáissico TTG em contato milonítico com rochas supracrustais do Greenstone Belt Rio das Velhas (Supergrupo Rio das Velhas) e coberturas paleoproterozóicas dos supergrupos Minas e Espinhaço (anteriormente Série Itacolomi) e da SSBV, com coberturas cenozóicas de canga e alúvio-coluvionares. A SSBV é constituída por quartzitos micáceos com estratificações cruzadas acanaladas de pequeno porte a metaconglomerados, caracteristicamente com fuchsita e sulfetos detríticos, com grânulos a calhaus de metachert e, localmente, de itabiritos. Em menor quantidade e mais restritos ocorrem ainda metaconglomerados polimíticos com seixos de quartzitos, metacherts e itabiritos, magnetita-cloritóide quartzitos com estratificações cruzadas acanaladas de pequeno porte com intercalações de grafita e hematita filitos e turmalinitos, assim como metabrechas intraformacionais itabiríticas. Essas rochas apresentam facies xisto verde predominante, a anfibolito, na parte leste da área. A SSBV desenvolveu-se em uma bacia alongada, de direção geral norte-sul, compartimentada, diretamente sobre o embasamento arqueano, com contribuição quartzosa do complexo gnáissico migmatítico TTG e, possivelmente, dos Metagranitóides Borrachudos (arqueanos), e contribuição detrítica do ouro das rochas do Greenstone Belt Rio das Velhas. A compartimentação da bacia levou à sedimentação de facies distintas - ao menos, no início de sua evolução - reforçada por tectônica sinsedimentar ao longo da deposição; nas facies superiores da SSBV predominam amplamente quartzitos micáceos com lentes de metaconglomerados de grânulos de metachert. O ambiente deposicional remete a uma planície de rios entrelaçados, temporariamente alagada e retrabalhada em ambiente intramaré, com inundação marinha final. O estudo das minas Ouro Fino, Cata Preta e Tesoureiro e do garimpo Fazenda Gualaxo mostrou serem as mineralizações de ouro da SSBV singenéticas, de tipo paleoplacer, com remobilização por veios de quartzo internos ao pacote sedimentar (da SSBV), de origens diagenéticas a metamórficas - de tipo paleoplacer modificado. Os grãos de ouro da SSBV apresentam teores de prata variáveis de até 15%, sem paládio, reforçando a proveniência exclusiva do ouro do Greenstone Belt Rio das Velhas. Os resultados obtidos e as observações nas continuações setentrionais da SSBV, incluindo o garimpo do Morro da Água Quente e as minas históricas de Pitanguí, Quebra Osso até Brumado, apontam para um padrão metalogenético único de mineralizações auríferas singenéticas de tipo paleoplaceres e paleoplaceres modificados, descaracterizados em proporções variáveis por retrabalhamentos tectono-metamórficos policíclicos. O potencial aurífero regional da SSBV é confirmado como elevado e para a sua definição são recomendados estudos específicos prospectivos e de viabilidade econômica. / The Sequência da Serra da Boa Vista (SSBV) stratches in a narrow belt of quartzites and metaconglomerates along the eastern border of the Quadrilátero Ferrífero in the districts of Santa Rita Durão, Bento Rodrigues and Camargos from Mariana, Minas Gerais to north of Catas Altas. The geology and gold mineralizations of the SSBV were studied, based on 1:25.000 mapping, detailed stratigraphical cross sections, mineralogical and petrographical studies, lithogeochemistry, geochemistry of the gold mineralizations and morphology and microgeochemistry of gold grains and associated minerals via SEM-EDS in order to understand better the Precambrian evolution and the metallogenesis of the gold of the SSBV as their as its relationships to other rock units of the region, mainly the Minas and Espinhaço supergroups. The study area comprises an Archean basement of TTG granitic gneisses in mylonitic contact with supracrustal rocks of the Rio das Velhas Greenstone Belt (Rio das Velhas Supergroup) and Paleoproterozoic metasedimentary deposits of the Minas and Espinhaço supergroups (formerly, Itacolomi Series) and the SSBV, with Cenozoic canga and alluvial and colluvial covers. Regionally, greenschist facies metamorphism prevails, grading to amphibolite facies in the eastern part of the area. SSBV consists of micaceous quartzites with small-scale cross-bedding and metaconglomerates with granules and pebbles of metachert and, locally, itabirites, characteristically with fuchsite and detritic sulfides. In smaller amounts and more restricted there occur polymictic metaconglomerates (with quartzite, metachert and itabirite pebbles), magnetite-chloritoid quartzites (with small-scale cross-bedding and intercalations of graphite and hematite phyllites and tourmalinite layers), as well as intraformational itabiritic metabrecchias. SSBV deposits developed directly upon the Archean basement in a narrow, elongate basin oriented and subdivided longitudinally in a north-south direction that received quartzose sediments from the gneissic-migmatitic TTG Complex and possibly from the Archean Borrachudos Metagranitoid; detritic gold came from the Rio das Velhas Greenstone Belt. Initial basin subdivision and ensuing synsedimentary tectonics led to sedimentation of different facies. In the upper part of the SSBV micaceous quartzites with lenses of metachert-granule metaconglomerates predominate. The depositional environment in the basin was a coastal braided river plain with periodic marine incursion accompained by intratidal reworkings and, finally, shallow-marine inundation. The study of the Ouro Fino, Cata Preta and Tesoureiro mines and the Garimpo Fazenda Gualaxo showed the gold mineralizations of the SSBV to be syngenetic, of paleoplacer and modified paleoplacer types with diagenetic to metamorphic remobilization (quartz veins) within the sedimentary sequence. Gold grains of the SSBV show variable silver contents up to 15%, without palladium, demonstrating the exclusive provenance of the gold from the Rio das Velhas Greenstone Belt. Results and observations in the northern SSBV, including the Garimpo do Morro da Água Quente and the Pitanguí and Quebra Osso-Brumado historic mines, indicate a homogeneous metallogenetic pattern of syngenetic gold mineralizations of paleoplacer and modified paleoplacer types, obliterated in varying proportions by tectono-metamorphic polyciclic reworkings. This study confirms the high regional gold potential of the SSBV and recommends specific prospective studies and economic viability analyses for its more complete definition.

Thesis (M.S.)--Massachusetts Institute of Technology, Alfred P. Sloan School of Management, 1981. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND DEWEY. / Bibliography: leaves 336-339. / by Josephine S. Jimenez. / M.S.

Essay 1: To delegate or not to delegate to stock markets: The case of boards with related industry expertise Abstract: I examine the extent to which boards with expertise in related product markets, i.e., downstream (customer) or upstream (supplier) industries, delegate their monitoring and advisory functions to stock markets. Directors from related industries (DRIs) are argued to have greater access to information about the input and output product markets of the firm. This, in turn, is predicted to reduce the reliance on stock-based compensation, a costly mechanism, particularly for firms that depend more on information about product markets and whose stock prices are not very informative about product markets. The evidence documented in this paper is largely consistent with these predictions. A number of additional tests suggest that this evidence is not likely to be explained by the potential conflict of interests between the firm’s stockholders and DRIs. Hence, I conclude that boards with related industry expertise delegate to stock markets to an optimally lesser extent due to their informational advantages. Essay 2: Stock-based CEO compensation following conglomerate acquisitions Abstract: I examine how stock-based incentive compensation for the CEO is designed following corporate acquisitions conditional on the economic nature of the acquisition. Large acquisitions represent significant changes in the economic environment of the firm. Furthermore, these changes are more likely to occur with conglomerate acquisitions. Accordingly, implications of the two mainstream theories of incentive compensation, i.e., efficient contracting theory and agency theory, are tested separately for conglomerate acquisitions. The empirical tests generally show that stock-based compensation is employed more intensely after conglomerate acquisitions than otherwise. Overall, the results documented in this paper seem consistent with the notion that greater economic uncertainties that are likely to follow conglomerate acquisitions induce the board to rely more heavily on stock-based incentives, an external monitoring mechanism.

Thesis (Ph. D.)--University of California, San Diego, 2004. / Vita. Includes bibliographical references (leaves 531-544).

A field guide is always a handy, but rare, little document, especially for a secondary educator. Therefore, the purpose of this project was to research, develop, write and present this document, for the Landels-Hill Big Creek Reserve. The University of California Natural Reserve System oversees thirty-six multi-acre, natural reserves. One part of the overall mission of these reserves is an educational outreach program in which curriculum is made available to the school systems. The curriculum is to be used to educate the students about each specific reserve area, to engage students in learning about their environment and to create an awareness of the need for conservation of wild areas. The final products from this research are a secondary-level geology guidebook, for students, with suggested classroom and in-field lessons, specifically written for the Landels-Hill Big Creek Reserve, Big Sur, California, along with a revised and updated geologic map of the Reserve and a teaching rock collection, for use at the Reserve. / text

This study has sought to probe the origin of Korean chaebols by employing theories that have been developed to account for the rise of American business organizations. By examining the top four chaebols qualitatively through detailed case analyses and 143 business groups quantitatively through statistical analyses, this study tests hypotheses raised by the three theoretical perspectives. The major findings of this study indicate that the political economy has been the dominant factor that contributed to transforming mediocre business groups into large chaebol groups. In particular, an organization's relationship with the state was of utmost significance. This study also indicates that the institutional isomorphism approach can complement politically motivated or efficiency-oriented theories. One of the major findings of this study is that Chandler's theory accounting for the rise of Korean chaebols is weak. However, its weakness does not stem from its main proposition that strategy calls for structural reform, but from its premise that growth strategy and structure presuppose economic and technological development. Williamson's transaction cost economics has a limited capability to account for the rise of the Korean chaebol. It is argued that the relative weakness of this theory may be inherent in its "universal" nature, which makes little provision for societal and cultural differences between the United States and Korea.

published_or_final_version / abstract / toc / Earth Sciences / Master / Master of Philosophy

No description available.

Thesis (Ph.D.)-University of Illinois at Urbana-Champaign, 2003. / Includes bibliographical references (leaves 144-147).

Thesis (M.S.)--Ohio University, August, 2004. / Includes bibliographical references (p. 152-159).