Academic literature on the topic 'Roi de Dacie'

AbstractAlthough moissanite has been found in various rocks, reliable primary moissanite has been reported only from kimberlites and meteorites. The Dabie Mountain moissanite reported in this paper is the first occurrence of primary moissanite hosted by serpentinite. It differs from synthetic silicon carbide in optical properties, inclusions and infrared spectrum. The biaxiality of the Dabie Mountain moissanite is thought to be the result of intracrystal deformation. In reference to the ultrahigh pressure (7—8 GPa) signature of exsolution of rod-like apatite, clinopyroxene and rutile in garnets, and magnetite lamellae in olivine reported in the Dabieshan, we inferred that the moissanite from the Dabie Mountains was probably generated at a depth of 180 km; and then subducted to a depth of 210—250 km, where the moissanite became biaxial before its exhumation.

The Paraná-Etendeka Continental Flood Basalt province hosts world-class agate and amethyst geode deposits in Rio Grande do Sul (Brazil; Serra Geral Fm.). Salto do Jacuí Mining District (Rio Grande do Sul, Brasil) has different types of agate geode hosted in vesicular basalt. A series of structural features has recently been investigated in the Salto do Jacuí Mining District, and indicates at least two volcanic episodes: i) normal tholeiitic basalt and dacite eruption, and ii) vesicular basalt and dacite intrusions as sills and dikes. These structural features include: basalt and aeolian sandstone xenoliths in vesicular basalts, vesicular basalt apophyses in massive basalts, sandstone and basalt breccias, sandstone dikes cutting across vesicular lavas and connected to mixed sandstone-agate geodes, sandstone assimilation by vesicular lava, and mixed sandstone and agate geodes. These features show that agate geodes were formed by melting of Botucatu sandstone xenoliths. High density contrast between vesicular basalt and Botucatu sandstone melts makes them immiscible during flow. Botucatu sandstone xenoliths melting is favored by degasing of intrusive volatile-rich basalts. The high-silica globs crystallize dynamically in a closed-system environment, giving rise to agate banding and fibrosity.

Alberto Moravia chega ao Brasil no verão de 1960 para presidir o congresso do PEN Club. Havia recém-concluído La noia, seu décimo primeiro romance, aquele que mais diretamente se liga à inspiração originária da obra de estreia, Gli indifferenti (1929), e que assinala uma decisiva virada em seu percurso artístico, intelectual e humano. O ensaio reconstrói aquele momento da vida e da obra do escritor de cinquenta anos, no qual se resume e se conclui uma pesquisa decenal e se abre uma nova fase. Repercorrendo os artigos escritos para Il Corriere della Sera e a resenha a Quarto de despejo de Carolina de Jesus, são focalizadas a origem e a aguda reflexão de Moravia sobre o Brasil daqueles anos (Brasília, Bahia, Rio), entre passado e futuro. A experiência do Brasil, para o escritor, que naqueles anos seguintes tentará novas estradas no campo intelectual e literário, e novas metas nas suas viagens, sempre mais orientados, na companhia de Dacia Maraini e de Pier Paolo Pasolini, em direção ao Terceiro Mundo e à África.

O presente estudo teve como objetivo avaliar a adequação da Bolsa Permanência concedida pela Universidade Federal do Estado do Rio de Janeiro (UNIRIO) aos estudantes oriundos de segmentos socioeconômicos menos favorecidos, considerando as especificidades da Universidade e dos estudantes contemplados com a referida bolsa. Foi desenvolvido numa abordagem responsiva uma vez que o aprofundamento do conhecimento dos elementos da cultura institucional é essencial para a compreensão da ação avaliada e pretendeu refletir os valores e perspectivas dos estudantes e profissionais envolvidos com a Bolsa Permanência. A coleta de dados foi realizada com a utilização de um questionário e um roteiro de entrevistas. Foram obtidos dados de 71 estudantes bolsistas matriculados em 19 diferentes cursos de Graduação e realizadas duas entrevistas com o Departamento de Assuntos Comunitários e Estudantis (DACE). A análise dos dados foi realizada por meio de estatística descritiva. Foi realizado exame de coerência dos resultados identificando convergências e possíveis divergências entre a visão dos estudantes bolsistas e a visão proposta pela administração da universidade. Os resultados encontrados sinalizam para a possibilidade de a Bolsa Permanência atingir os propósitos para os quais foi criada.

Abstract Radial and linear dike swarms in the eroded roots of volcanoes and along rift zones are sensitive structural indicators of conduit and eruption geometry that can record regional paleostress orientations. Compositionally diverse dikes and larger intrusions that radiate westward from the polycyclic Platoro caldera complex in the Southern Rocky Mountain volcanic field (southwestern United States) merge in structural trend, composition, and age with the enormous but little-studied Dulce swarm of trachybasaltic dikes that continue southwest and south for ∼125 km along the eastern margin of the Colorado Plateau from southern Colorado into northern New Mexico. Some Dulce dikes, though only 1–2 m thick, are traceable for 20 km. More than 200 dikes of the Platoro-Dulce swarm are depicted on regional maps, but only a few compositions and ages have been published previously, and relations to Platoro caldera have not been evaluated. Despite complications from deuteric alteration, bulk compositions of Platoro-Dulce dikes (105 new X-ray fluorescence and inductively coupled plasma mass spectrometry analyses) become more mafic and alkalic with distance from the caldera. Fifty-eight (58) new 40Ar/39Ar ages provide insight into the timing of dike emplacement in relation to evolution of Platoro caldera (source of six regional ignimbrites between 30.3 and 28.8 Ma). The majority of Dulce dikes were emplaced during a brief period (26.5–25.0 Ma) of postcaldera magmatism. Some northeast-trending dikes yield ages as old as 27.5 Ma, and the northernmost north-trending dikes have younger ages (20.1–18.6 Ma). In contrast to high-K lamprophyres farther west on the Colorado Plateau, the Dulce dikes are trachybasalts that contain only anhydrous phenocrysts (clinopyroxene, olivine). Dikes radial to Platoro caldera range from pyroxene- and hornblende-bearing andesite to sanidine dacite, mostly more silicic than trachybasalts of the Dulce swarm. Some distal andesite dikes have ages (31.2–30.4 Ma) similar to those of late precaldera lavas; ages of other proximal dikes (29.2–27.5 Ma) are akin to those of caldera-filling lavas and the oldest Dulce dikes. The largest radial dikes are dacites that have yet younger sanidine 40Ar/39Ar ages (26.5–26.4 Ma), similar to those of the main Dulce swarm. The older andesitic dikes and precaldera lavas record the inception of a long-lived upper-crustal magmatic locus at Platoro. This system peaked in magmatic output during ignimbrite eruptions but remained intermittently active for at least an additional 9 m.y. Platoro magmatism began to decline at ca. 26 Ma, concurrent with initial basaltic volcanism and regional extension along the Rio Grande rift, but no basalt is known to have erupted proximal to Platoro caldera prior to ca. 20 Ma, just as silicic activity terminated at this magmatic locus. The large numbers and lengths of the radial andesitic-dacitic dikes, in comparison to the absence of similar features at other calderas of the San Juan volcanic locus, may reflect location of the Platoro system peripheral to the main upper-crustal San Juan batholith recorded by gravity data, as well as its proximity to the axis of early rifting. Spatial, temporal, and genetic links between Platoro radial dikes and the linear Dulce swarm suggest that they represent an interconnected regional-scale magmatic suite related to prolonged assembly and solidification of an arc-related subcaldera batholith concurrently with a transition to regional extension. Emplacement of such widespread dikes during the late evolution of a subcaldera batholith could generate earthquakes and trigger dispersed small eruptions. Such events would constitute little-appreciated magmato-tectonic hazards near dormant calderas such as Valles, Long Valley, or Yellowstone (western USA).

This thesis will focus on the work of eight British poets established in the 1950s or ‘60s as part of either the ‘Movement’ or the ‘British Poetry Revival’. The research will proceed from the prominent role played by these two groupings in understandings of British poetry, as expressed in existing criticism and in a number of poetry anthologies. As will be demonstrated, the opposition of these groups frequently stands in place of a more fundamental binary view of twentieth-century British poetry, which might be expressed in terms of mainstream versus margins or traditionalism versus experimentalism. At the core of this thesis, the eight poets under discussion will be placed in a series of comparisons that deliberately invokes such a binary split. Reading their poetry with a focus on landscape and ‘located identity’, I will suggest that the opposition between Movement and Revival poetry may be re-examined with a geographical or spatial emphasis. After introducing the critical terrain, I will demonstrate how poetry anthologies have helped frame the two groups of poets with potentially incompatible models of literary history. These models will be shown to engage with questions of cultural identity and the relationship of literary texts to national space. This will lay the foundations for my central chapters, which will each begin with a literary method of distinguishing Movement and Revival practice, but will then reveal the discourses of identity, locality, and territory that are also involved. Thus, the thesis will engage with matters of realism, syntax, lyricism, and poetic structure, for instance, but will also intimately connect such considerations to its central concern with located identity. By enacting this re-phrasing of an existing binary, I aim not only to fruitfully illuminate and interlink the two bodies of poetry, but also to suggest an altered method of mapping British poetry.