Thesis (Ph.D.) - University of Queensland, 2005. / Includes bibliography.

Thesis (M.Psych.Sport.& Ex.(Qual.)) - University of Queensland, 2005. / Includes bibliography.

Thesis (Ph.D.) - University of Queensland, 2006. / Includes bibliography.

Thesis (Ph.D.) - University of Queensland, 2005. / Includes bibliography.

Gold-bearing volcanic breccia complexes are the major sources of gold in the Tasman Fold Belt System in north Queensland. The Tasman Fold Belt System represents the site of continental accretion as a series of island-arcs and intra-arc basins with accompanying thick sedimentation, volcanism, plutonism, tectonism and mineralisation. In north Queensland, the fold belt system comprises the Hodgkinson-Broken River Fold Belt, Thomson Fold Belt, New England Fold Belt and the Georgetown Inlier. The most numerous ore deposits are associated with calc-alkaline volcanics and granitoid intrusivesof the transitional tectonic stage of the fold belt system. The formation and subsequent gold mineralisation of volcanic breccia complexes are related to Permo-Carboniferous magmatism within the Thomson Fold Belt and Georgetown Inlier. The two most important producing areas are at Mount Leyshon and Kidston mines, which are high tonnage, low-grade gold deposits. The Mount Leyshon breccia complex was emplaced along the contact between CambroOrdovician metasedimentary and metavolcanic rocks, and Ordovician-Devonian I-type granitoids of the Lolworth-Ravenswood Block. The Kidston breccia complex is located on a major lithological contact between the Early to Middle Proterozoic . Einasleigh Metamorphics and the Silurian-Devonian Oak River Granodiorite. The principal hosts to the gold mineralisation at the Mount Leyshon and Kidston deposits, are breccia pipes associated with several episodes of porphyry intrusives. The goldbearing magmatic-hydrothermal and phreatomagmatic breccias post-date the development of a porphyry-type protore. The magmatic-hydrothermal breccias were initially emplaced without the involvement of meteoric-hydrothermal fluids, within a closed system. Later magma impulses reached higher levels in the cooled upper magma chamber, where meteoric water invaded the fracture system. This produced an explosive emplacement of phreatomagmatic breccias, as seen at Mount Leyshon. Widespread sericitisation and pyrite mineralisation are common, with cavity fill, disseminated and fracturelveincontrolled gold and base metal sulphides. The Kidston and Mount Leyshon breccia complexes have hydrothermal alteration and mineralisation characteristics of the 'Lowell-Guilbert Model'. However, the argillic zone is generally not well defined. The gold travelled as chloride complexes with the hydrothermal fluids before being deposited into cavities and fractures of the breccias. Later stage epithermal deposits formed at the top of the breccia complexes that were dominantly quartz-adularia-sericite-type. The erosion, collapse and further intrusion of later porphyry phases allowed the upper parts of the breccia complexes to mix with the lower hydrothermal systems. Exploration for gold-related volcanic breccia complexes is directed at identifying hydrothermal alteration. This is followed by detailed ground studies including geological, mineralogical, petrological and geochemical work, with the idea of constructing a 'model' that can be tested with subsequent subsurface work (e.g. drilling). Geomorphology, remote sensing, geochemistry, geophysics, petrology, isotopes and fluid inclusions are recommended exploration techniques for the search of gold-bearing volcanic breccia complexes. Spectral remote sensing has especially become an important tool for the detection of hydrothermal alteration. Clay and iron minerals of the altered rock, within the breccia complexes, have distinctive spectral characteristics that can be recognisable in multispectral images from the Landsat thematic mapper. The best combination of bands, when using TM remote sensing for hydrothermally altered rock, are 3/5/7 or 4/5/7. The breccia complexes have exploration signatures represented as topographic highs, emplaced within major structural weaknesses, associated I-type granitic batholiths, early potassic alteration with overprint of sericitic alteration, and an associated radiometric high and magnetic low. The exploration for gold-bearing volcanic breccia complex deposits cannot be disregarded, because of the numerous occurrences that are now the major gold producers in north Queensland.

The palaeoecology of selected fossil sites from the Riversleigh World Heritage Area, northwestern Queensland, Australia, was studied with the aim of describing the palaeohabitats of the sites through the use of characteristics of mammalian community structure. Taphonomic analyses were carried out to determine whether the study sites represent allochthonous or autochthonous assemblages. Subsequently, ecological attributes of the mammalian fossil assemblages were inferred from functional morphology. Trophic and locomotor behaviours were used to describe the adaptive structure of communities and a method was established for inferring the locomotor behaviour of fossil taxa from morphometrics of their calcanea. Such ecological attributes of the assemblages can be used in reconstructing habitats. This is possible because modern mammalian community structure (as represented by ecological diversity/attribute characteristics) has been found to correlate with habitat structure and thus has predictive value, directly applicable in palaeoecology. Modern mammalian faunas from a variety of habitats around the world were used as possible analogues for the Riversleigh fossil faunas. Multivariate statistical techniques were explored for identifying potential similarities between the community structure of the fossil faunas and that of the modern faunas. Annual rainfall was then estimated for the fossil sites through regression analysis allowing climatic inference from the faunal palaeocommunities. On the basis of similarities in community structure, general habitat or vegetation structure was proposed for the fossil assemblages. The results of the analyses undertaken indicate that Riversleigh early-middle Miocene habitats were densely forested. The late Oligocene Quantum Leap Site local fauna and the late Miocene Encore Site local fauna suggest mixed vegetation, or more open environments. The trend of decreasing annual rainfall through the Miocene and the palaeohabitats of the Miocene sites proposed here fit the general pattern of vegetation and climate change during this period for the Australian continent as a whole.

This research study explores the issue of teacher leadership in South-East Queensland Anglican schools. An initial exploration of the context of Anglican education in South-East Queensland confirmed that both nationally and within the Anglican system, hierarchical understandings of school leadership were being challenged amidst a growing expectation of teacher leadership. However, despite this expectation of teacher leadership, there was little in respect to formal policy and resource support for teacher leadership within South-East Queensland Anglican schools. This research study seeks to gain a more informed and sophisticated understanding of teacher leadership, with particular focus on the perspective of classroom teachers. A comprehensive analysis of key literature in educational change, professionalism in education and educational leadership, revealed a number of key insights that informed this study. Significant socio-economic change in recent decades has brought about corresponding educational change. This has resulted in a call for greater professionalism in education and a new paradigm of educational leadership. Within this context, there is new interest in distributing leadership beyond the formal role of the principal and into the hands of teacher leaders. However, a further review of the literature highlighted the lack of a clear conceptualisation of teacher leadership. While teacher leadership is predominantly considered in the literature as the domain of those in formal, positional roles, less is known about informal, in-class teacher leadership. Based on these insights, the researcher identified one major research question: How do teachers, who are recognised as teacher leaders in South-East Queensland Anglican schools, conceptualise teacher leadership? To answer this research question, four research sub-questions were posed: Behaviour of teacher leaders - What do they do? Purpose of teacher leadership - Why do teachers strive for this? Feelings of teacher leaders - How do they feel about what they do? Support for teacher leaders - What do they need? This research study is situated within the theoretical framework of symbolic interactionism. As both a perspective and a method, symbolic interactionism is situated within a pragmatic constructivist research paradigm. This research study explored a restricted group of 16 teachers within three South-East Queensland Anglican schools, and employed qualitative research methods including Experience Sampling Method and focus group interviews. The findings of this research study suggest that teacher leaders in South-East Queensland Anglican schools have a confused conceptualisation of teacher leadership, with little common symbolic language to delineate the phenomenon. This study made the following conclusions in relation to teacher leadership in South-East Queensland Anglican schools: The broad understanding of teacher leadership is unrecognised in the field of education. Teacher leadership is a complex phenomenon. Teacher leadership is principled action in support of learning. There is untapped potential for teacher leaders to act as change agents in school revitalisation. Collegial relationships, the provision of time, relevant professional development and administrative support enable teacher leadership There is a need for a role-making policy to support teacher leadership. The development of teacher leadership in South-East Queensland Anglican schools requires support from the Anglican Schools Commission, school principals and the teachers themselves, through deliberate action in developing appropriate policy and practice.

Thesis (B.A. (Hons)) - University of Queensland, 2006. / Includes bibliography.

Thesis (B.Psy.Sc.(Hons.)) - University of Queensland, 2006. / Includes bibliography.

Thesis (M.Phil.) - University of Queensland, 2006. / Includes bibliography.