[Truncated abstract] Banded iron formations of the ~27702405 Ma Hamersley Province of Western Australia were locally upgraded to high-grade hematite ore during the Early Palaeoproterozoic by a combination of hypogene and supergene processes after the initial rise of atmospheric oxygen. Ore genesis was associated with the stratigraphic break between Lower and Upper Wyloo Groups of the Ashburton Province, and has been variously linked to the Ophthalmian orogeny, late-orogenic extensional collapse, and anorogenic continental extension. Small spot PbPb dating of in situ baddeleyite by SHRIMP (sensitive highresolution ion-microprobe) has resolved the ages of two key suites of mafic intrusions constraining for the first time the tectonic evolution of the Ashburton Province and the age and setting of iron-ore formation. Mafic sills dated at 2208 ± 10 Ma were folded during the Ophthalmian orogeny and then cut by the unconformity at the base of the Lower Wyloo Group. A mafic dyke swarm that intrudes the Lower Wyloo Group and has close genetic relationship to iron ore is 2008 ± 16 Ma, slightly younger than a new syneruptive 2031 ± 6 Ma zircon age for the Lower Wyloo Group. These new ages constrain the Ophthalmian orogeny to the period <2210 to >2030 Ma, before Lower Wyloo Group extension, sedimentation, and flood-basalt volcanism. The ~2010 Ma dykes present a new maximum age for iron-ore genesis and deposition of the Upper Wyloo Group, thereby linking ore genesis to a ~21002000 Ma period of continental extension similarly recorded by Palaeoproterozoic terrains worldwide well after the initial oxidation of the atmosphere at ~2320 Ma. The Lower Wyloo Group contains, in ascending order, the fluvial to shallow-marine Beasley River Quartzite, the predominantly subaqueously emplaced Cheela Springs flood basalt and the Wooly Dolomite, a shelf-ramp carbonate succession. Field observations point to high subsidence of the sequence, rather than the mainly subaerial to shallow marine depositional environment-interpretation described by earlier workers. Abundant hydro-volcanic breccias, including hyaloclastite, peperite and fluidal-clast breccia all indicate quench-fragmentation processes caused by interaction of lava with water, and support the mainly subaqueous emplacement of the flood basalt which is also indicated by interlayered BIF-like chert/mudstones and below-wave-base turbiditic mass-flows.

The New Zealand Government�s repatriation measures to assist Great War veterans have largely been considered a failure. This thesis examines repatriation through the experiences of Dunedin and Ashburton veterans, demonstrating that within the context of the 1920s pre-welfare state these provisions proved to be both generous and far more successful than is often suggested. The Government�s repatriation response to returning veterans reflected contemporary attitudes towards dependency and need. Belief in self-reliance underpinned repatriation policy, with a stated aim of restoring veterans to the civil position they held prior to enlistment rather than providing assistance to move up the occupational ladder. Fear of the morally corrosive effect of dependency, as well as economic concerns, meant the repatriation provisions were principally concerned with ensuring veterans regained financial independence through employment. To that end war pensions compensated for lost earning power, rather than providing a full living income, and repatriation provisions largely consisted of assistance in finding jobs or obtaining farms and businesses. The Government�s repatriation provisions also reflected contemporary medical knowledge. The repatriation legislation restricted war pensions and free medical care to veterans with disabilities directly attributable to military service. However the link between military service and disability remained unclear in many cases. Slightly more than half of those discharged unfit suffered from sickness rather than wounds, many from conditions common among the civilian population. Contemporary aetiological knowledge often did not support the war pension applications lodged by returned soldiers disabled as a result of non-contagious disease, and an absence of clinical evidence undermined claims of latent illness. In addition the medical profession�s failure to adopt psychological theory and practice meant that by the early 1920s shell shock sufferers were treated according to psychiatric medicine�s understanding of mental illness. Within the context of 1920s New Zealand the repatriation provisions were generous: the Repatriation Department�s work had no precedent; the war disabled were one of the few groups to receive state pensions and received more than other state pensioners; and the provisions of the soldier settlement scheme were available to all veterans, regardless of health, capital or farming experience. Despite the limited aims of the Government�s repatriation provisions many veterans did successfully re-establish themselves in civilian society. By the 1930s Ashburton soldier settlements had proved more successful than others in Canterbury, and compared well with other crown settlements in Ashburton County. More generally war service produced no dramatic change in the occupational structure of veterans: veterans generally retained their occupational status during the post-war decade, volunteers faring slightly better than conscripts but neither as well as their civilian counterparts. Although some veterans certainly did experience need and indigence after the war the majority of urban and rural men in the sample groups were financially stable, particularly after the boom and bust of the immediate post-war years. The men in the Dunedin and Ashburton sample groups represent the most successful of the returned soldier population nevertheless they show that a significant proportion of Great War veterans were successfully repatriated by the end of the post-war decade.

Water is a valuable and crucial resource, the protection of which poses environmental, social and economic challenges. Fundamental to the sustainable use of water is effective management. In the Canterbury region of New Zealand, nitrate contamination has become a resource management issue due to changes in land use and intensification, which have placed pressure on the region’s groundwater and surface water systems. The purpose of this study was to assess and track nitrate concentrations on the Central Canterbury Plains with specific emphasis on a local point source of nitrate, the Ashburton Meat Processors plant. To make this assessment review of historical data was followed by the collection of 131 groundwater and 25 surface water samples to analyse the geochemical properties of the water and the stable isotopic composition of nitrate in the water. It was hypothesised that nitrate concentrations at a regional scale have increased since regular records began and that the stable isotopic composition of different nitrate sources are not discernable. Nitrate concentrations across the Canterbury region were found to have increased, prompting concerns about water quality. Concentrations are elevated above natural background levels across much of the Canterbury Plains and extreme concentrations are associated with local point sources of nitrate. Nitrate concentrations down gradient of the Ashburton Meat Processing plant are shown to have declined approximately 5% per year for the past ten years, which is in contrast to the rest of the region, where average concentrations have nearly doubled in 20 years. The reduction of contamination from the point source is most likely the result of the implementation of better wastewater management practices in the early 21st century. The δ18O and δ15N values of nitrate were found to be relatively homogenous over the Canterbury Plains. Therefore, it is suggested by this study that the dual-isotope approach alone, is not a viable tool for nitrate source identification in the region. The uniform nitrate stable isotopic composition in Canterbury could be attributed to a single, principle source of nitrate, such as clover, that overprints other isotopic compositions of nitrate source, or may also be the result of soil processes and the farming techniques used in the region. This research presents important findings for the future of identifying and managing nitrate sources in the Canterbury region. Better management practices are required for the diffuse source(s) of nitrate contributing to the widespread contamination. Critical thinking and the willingness of stakeholders to engage in the identifying, documenting and solving problems is necessary to ensure the effective management and sustainability of this precious resource.

The New Zealand Government�s repatriation measures to assist Great War veterans have largely been considered a failure. This thesis examines repatriation through the experiences of Dunedin and Ashburton veterans, demonstrating that within the context of the 1920s pre-welfare state these provisions proved to be both generous and far more successful than is often suggested. The Government�s repatriation response to returning veterans reflected contemporary attitudes towards dependency and need. Belief in self-reliance underpinned repatriation policy, with a stated aim of restoring veterans to the civil position they held prior to enlistment rather than providing assistance to move up the occupational ladder. Fear of the morally corrosive effect of dependency, as well as economic concerns, meant the repatriation provisions were principally concerned with ensuring veterans regained financial independence through employment. To that end war pensions compensated for lost earning power, rather than providing a full living income, and repatriation provisions largely consisted of assistance in finding jobs or obtaining farms and businesses. The Government�s repatriation provisions also reflected contemporary medical knowledge. The repatriation legislation restricted war pensions and free medical care to veterans with disabilities directly attributable to military service. However the link between military service and disability remained unclear in many cases. Slightly more than half of those discharged unfit suffered from sickness rather than wounds, many from conditions common among the civilian population. Contemporary aetiological knowledge often did not support the war pension applications lodged by returned soldiers disabled as a result of non-contagious disease, and an absence of clinical evidence undermined claims of latent illness. In addition the medical profession�s failure to adopt psychological theory and practice meant that by the early 1920s shell shock sufferers were treated according to psychiatric medicine�s understanding of mental illness. Within the context of 1920s New Zealand the repatriation provisions were generous: the Repatriation Department�s work had no precedent; the war disabled were one of the few groups to receive state pensions and received more than other state pensioners; and the provisions of the soldier settlement scheme were available to all veterans, regardless of health, capital or farming experience. Despite the limited aims of the Government�s repatriation provisions many veterans did successfully re-establish themselves in civilian society. By the 1930s Ashburton soldier settlements had proved more successful than others in Canterbury, and compared well with other crown settlements in Ashburton County. More generally war service produced no dramatic change in the occupational structure of veterans: veterans generally retained their occupational status during the post-war decade, volunteers faring slightly better than conscripts but neither as well as their civilian counterparts. Although some veterans certainly did experience need and indigence after the war the majority of urban and rural men in the sample groups were financially stable, particularly after the boom and bust of the immediate post-war years. The men in the Dunedin and Ashburton sample groups represent the most successful of the returned soldier population nevertheless they show that a significant proportion of Great War veterans were successfully repatriated by the end of the post-war decade.