The extrusive and intrusive members of the St. Helena rock suite (SHRS) are formed in an intra-oceanic plate tectonic setting as part of two shield volcanoes. The SHRS vary from picrobasalts to phonofites. The former represent mantle derived melts, whereas the remainder of the suite have undergone differing degrees of crystal fractionation. A stratigraphic framework is developed to illustrate temporal geochemical variations over 2 Ma of subaerial activity. This is accomplished in conjunction with a detailed field study of the SHRS by Baker(1968) which is shown to be largely accurate. It is demonstrated that ascending magma batches are substantially modified by crystal fractionation and subsequent alteration processes. Petrogenetic modelling shows that the genesis of the SHRS is consistent with small degree (1-10%) melting of an olivine - clinopyroxene - orthopyroxene - garnet source containing a residual K-rich phase. Combined Sr-Nd-Pb isotope and fractionation corrected trace element data for fresh rocks enable consideration of changing thermal and chemical fluxes impinging on and interacting with the base of the lithosphere over a period of at least 2 Ma. The existence of two geochemically distinct components in the source region is indicated. A H/MU (high 238U /104Pb)c omponent has extremely radiogenic Pb isotopes (206Pb/104Pb> 20.8) with 143Nd/'44Nd and 87S8r,6 Sr displaced below the mantle array. The complementary depleted component has less radio genic Pb and Sr isotopic compositions and more radio genic Nd compositions. The limited variation of geochemical compositions in the SHRS (caused by mixing of these components) is attributed to the dissimilarity of the components in terms of their trace element abundance and their similarity in terms of ratios of highly incompatible elements. Coupled trace element and isotope variations are evident during the activity of each volcano. During shield development an increase in incompatible trace element enrichment occurs. This is coupled to a decrease in 143Nd/'44Nd, whilst Sr and Pb become progressively more radiogenic. The time dependent variations are thought to be consistent with mixing and melting processes occurring at the base of, or within the lithosphere. A decrease in the signature of the depleted component at the end of activity of the NE volcano and SW volcano is the inferred result of a decreasing thermal flux acting on the base of the lithosphere. With lower heat input less fusion of the depleted component (from the asthenosphere or lithosphere) occurs resulting in an increased H/MU signature in the erupted products through time. Previous explanations for the development of the dominant HIMU component are critically reviewed by considering shared isotope and trace element characteristics for HIMU OIB. U-Th-Pb systematics suggest the HIMU component has remained discrete from other mantle components for approximately 2 Ga. The fractionation event producing the H/MU component is shown to cause an increase in U/Pb and a decrease in Rb/Sr and Th/U.. This is thought to be consistent with a model suggested by Hofmann and White(1980,1982). in which HIMU represents ancient recycled altered oceanic crust. It is demonstrated that other models are less tenable. It is thought that the HIMU characteristics necessitate modification of oceanic crust in subduction zones in addition to the geochemical changes caused by hydrothermal alteration of oceanic crust.

Thesis (Min.D.) -- McCormick Theological Seminary, 2000. / Includes bibliographical references.

Thesis (doctoral)--Albert-Ludwigs-Universität, Freiburg i. Br. / Description based on print version record.

Thesis (M.A.)--Stellenbosch University, 1951. / ENGLISH ABSTRACT: no abstract available / AFRIKAANSE OPSOMMING: geen opsomming

Made available in DSpace on 2014-06-12T18:37:47Z (GMT). No. of bitstreams: 2 arquivo8359_1.pdf: 924216 bytes, checksum: 650c73ff27d3a2bdf709fea38f5b6a98 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2004 / O presente estudo realizou-se a partir da investigação da relação entre a criação literária e a realidade da época de produção do romance Mulher no espelho, obra da escritora baiana, contemporânea, Helena Parente Cunha. O móvel da pesquisa foi olhar a mulher protagonista do discurso ficcional daquele romance, em consonância à mulher do cotidiano real. Neste ponto, pretendemos elucidar os procedimentos teórico-literários que a autora teria empregado para configurar o perfil feminino de sua protagonista, a partir da matéria prima do contexto histórico social real, além de nos prolongar na observação quanto ao compromisso de Helena Parente Cunha com a condição humana em relação às desigualdades de gêneros. O interesse em surpreendermos no texto ficcional a mulher de seu tempo realizou-se mediante a observação da estruturação da obra, visando a alguns aspectos sociais mediatizados na organização interna do romance em foco. Ao determo-nos na relação autor/obra/realidade, sem a ingenuidade de um mero espelhamento do real na obra de arte literária, propusemo-nos à investigação não da correspondência com pessoas vivas, mas como o real serviu de matéria para o complexo narrativo da ficção

This thesis explores the textualizing of the South Atlantic island of St Helena (a British Overseas Territory) through an analysis of the relationship between colonizing practices and the changing representations of the island and its inhabitants in a range of colonial 'texts', including historiography, travel writing, government papers, creative writing, and the fine arts. Part I situates this thesis within a critical engagement with post-colonial theory and colonial discourse analysis primarily, as well as with the recent 'linguistic turn' in anthropology and history. In place of post-colonialism's rather monolithic approach to colonial experiences, I argue for a localised approach to colonisation, which takes greater account of colonial praxis and of the continuous re-negotiation and re-constitution of particular colonial situations. Part II focuses on a number of literary issues by reviewing St Helena's historiography and literature, and by investigating the range of narrative tropes employed (largely by travellers) in the textualizing of St Helena, in particular with respect to recurrent imaginings of the island in terms of an earthly Eden. Part III examines the nature of colonial 'possession' by tracing the island's gradual appropriation by the Portuguese, Dutch and English in the sixteenth and early seventeenth century and the settlement policies pursued by the English East India Company in the late seventeenth and early eighteenth century. Part IV provides an account of the changing perceptions, by visitors and colonial officials alike, of the character of the island's inhabitants (from the late eighteenth to the early twentieth century) and assesses the influence that these perceptions have had on the administration of the island and the political status of its inhabitants (in the mid- to late twentieth century). Part V, the conclusion, reviews the principal arguments of my thesis by addressing the political implications of post-colonial theory and of my own research, while also indicating avenues for further research. A localised and detailed exploration of colonial discourse over a period of nearly five hundred years, and a close analysis of a consequently wide range of colonial 'texts', has confirmed that although colonising practices and representations are far from monolithic, in the case of St Helena their continuities are of as much significance as their discontinuities.

Based on the assumption that the work of contemporary Swedish poet Helena Eriksson, in various ways elaborates the inseparable relation between body and language, this study aims to investigate how this view of language comes to expression in her poetry. Stepping from a theoretical background of feminist perspectives on the body, as well as recent theories on poetic materiality, the analysis points out how the concepts of aesthetic and/or linguistic materiality, social and technological materiality, and what can be described as the ethical dimension of materiality, all as termed by Jesper Olsson and Fredrik Hertzberg, take on feminist implications in Eriksson’s poetry. Through the theory of feminist anthropologist Vicki Kirby and her account of Derrida’s general view of writing, the study makes use of a deconstructive approach to the later work of Eriksson. It is shown in the analysis how this poetry can be effectively mirrored against Kirby’s concept of corporeography, in order to make visible the elision of the breach between meaning and materiality. In this respect, Kirby’s theoretical device ”The body as the scene of writing” in particular, is vastly adapted. Arriving at its conclusion, the study suggests that by engaging the body in the writing of poetry, allowing it to re-inscribe the scripture already made upon it by culture, the poet as woman can preserve her subjectivity and her sense of corporeality.

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção. / Made available in DSpace on 2012-10-22T00:27:08Z (GMT). No. of bitstreams: 0

St Helena Island in the South Atlantic Ocean has been changing for over a decade. The way the people on the Island respond to the change affects the way in which the Gospel is communicated, and this has missiological implications. This raises the question; what influence does change have on the way the Gospel is communicated? If people are resistant to social change, will they be open to change required by the Gospel? How will good intercultural skills help? To fully address the Island's response to change, one needs to look at the interplay of change, culture and communication. It also important to consider how these three elements can be monitored and managed by both the Saints and the clergy alike. This will become the basis for my proposal of focusing the intercultural communication of the Gospel on the ever-changing world of the youth. / Christian Spirit, Church History, Missiology / M.Th. (Missiology)

St Helena Island in the South Atlantic Ocean has been changing for over a decade. The way the people on the Island respond to the change affects the way in which the Gospel is communicated, and this has missiological implications. This raises the question; what influence does change have on the way the Gospel is communicated? If people are resistant to social change, will they be open to change required by the Gospel? How will good intercultural skills help? To fully address the Island's response to change, one needs to look at the interplay of change, culture and communication. It also important to consider how these three elements can be monitored and managed by both the Saints and the clergy alike. This will become the basis for my proposal of focusing the intercultural communication of the Gospel on the ever-changing world of the youth. / Christian Spirit, Church History, Missiology / M.Th. (Missiology)