U, FE, AND LI ISOTOPE RATIOS IN THE MINERALIZED AND BARREN AREAS OF THE KOMBOLGIE BASIN

The Paleo- to Meso-Proterozoic Jabiluka unconformity related uranium mine is located within the Alligator River Uranium Field, found in the Northern Territories, Australia. The uranium ore is hosted in the late middle Paleoproterozoic Cahill Formation, which is unconformably overlain by a group of unmetamorphosed conglomerates known as the Kombolgie subgroup. The Kombolgie subgroup provided the source for oxidized basinal brines, carrying U as the mobile form U(VI), which interacted with reducing lithologies in the Cahill formation, thus reducing U(VI) to the solid U(IV), and leading to the precipitation of uraninite (UO2). In order to characterize fluid interaction with the ore body and compare that to areas without mineralization, several isotopic tracers were studied on a series of clay samples from drill core at Jabiluka as well as in barren areas throughout the ARUF. Among the potential tracers, three were selected: U (redox sensitive and recent fluid mobilization), Fe (redox sensitive), and Li (fractionated by hydrothermal fluids and adsorption reactions). δ238U values were found to be closely linked to the mineralogy, with samples with higher K/Al ratios (indicating high illite and low chlorite concentrations) having higher δ238U values. This demonstrates that 235U preferentially absorbs onto the surface of chlorite during hydrothermal circulation. In addition, δ234U values lie far from secular equilibrium (δ234U of 30‰), indicating there was addition or removal of 234U from the surface of the samples from recent (<2.5Ma) interactions of mobile fluids. δ57Fe values were found to be related to lithology and spatially to known uranium deposits. Decreasing δ57Fe values were found with increasing depth to the unconformity in a drill hole directly above the ore zone, but not in drill holes in the barren area. Similarly to δ238U, δ7Li is found to correlate with mineralogy, with higher δ7Li values associated with samples with more chlorite. In addition, higher δ7Li values are found at greater depth throughout the basin, indicating that the direction of the mineralizing fluid circulation was upwards from the Cahill formation to the Kombolgie subgroup.

A Historical Materialist Approach to the Eurozone Crisis: Fictitious Capital, States, and Capital Accumulation

This dissertation examines the ongoing European sovereign debt crises that began with Greece in 2009, in the wake of the US subprime mortgage crisis. Through the application of a historical materialist approach, I attempt to understand the on-going crisis in the European Monetary Union (EMU) by investigating root causes of sovereign debt crises, relations of power, and main beneficiaries of the policy responses. My theoretical framework hinges on three contradictions in capitalism: the tendency towards overaccumulation, the tension between fictitious capital and the productive base, and the contradiction inherent in capitalist states between their role as a national state and as a class state. In contrast to the dominant positions that locate the cause of the crisis within either: debtor states; creditor states; or the framework at the EMU, I argue that these sovereign debt crises are actually a broader crisis of crisis of capitalism within the EMU itself. In order to do so, I trace the evolution of the political economy of the Eurozone in the post-Bretton woods era, with a particularly focus on the credit system. More specifically, I argue that these crises are the result of an interaction between three meso-level contradictions that have developed within the EMU region: 1) Germany’s postwar accumulation regime, which has produced a deep crisis of overaccumulation; 2) the contradictory processes associated with the neoliberal logic of the EMU, by which I mean the rush to lower barriers to credit and finance at the expense of all else; and 3) credit-fueled, consumption-based EMU integration in the periphery; and. These three contradictions came together in the wake of the 2007-2008 US subprime crisis to form an overall crisis of capitalism in the Eurozone, expressed, as I suggest, as a crisis of fictitious capital. This dissertation aims to contribute to the ongoing project among critical political economists to de-naturalize and re-politicize money, while challenging the hegemony of monetarism within neoliberalism. Second, there has yet to be a comprehensive study that examines the EMU, Germany, and the crises in the periphery from a holistic, historical materialist analysis.