Pelletisation of seawater-neutralised bauxite refinery residues (Bauxsol?) for construction of permeable reactive barriers to treat flowing acid mine waters. Acid mine drainage (AMD) occurs where sulphides (mostly pyrite, but also sulphides of other metals) are exposed to oxygen and water; the estimated global liability from AMD is over US$300 billion. There is currently no cost-effective way to prevent the release of acid and heavy metals from exposed sulphide minerals especially at abandoned m ....Pelletisation of seawater-neutralised bauxite refinery residues (Bauxsol?) for construction of permeable reactive barriers to treat flowing acid mine waters. Acid mine drainage (AMD) occurs where sulphides (mostly pyrite, but also sulphides of other metals) are exposed to oxygen and water; the estimated global liability from AMD is over US$300 billion. There is currently no cost-effective way to prevent the release of acid and heavy metals from exposed sulphide minerals especially at abandoned mine sites. This study investigates the pelletisation and use of neutralised bauxite refinery residues (Bauxsol?) to treat flowing metal-rich acid mine drainage waters using reactive-barriers that will neutralise acid and remove heavy metals without impeding flow.Read moreRead less
Factors influencing the bioavailability of iron in marine waters. Strong evidence now exists that iron availability controls the productivity and species composition of planktonic organisms in open oceans and coastal and estuarine environments. The mechanisms by which iron is rendered available and induces growth remain unclear but appear to involve, in many instances, light and both generic and specific organic complexants of iron. In this study, we investigate the effect of selected naturally ....Factors influencing the bioavailability of iron in marine waters. Strong evidence now exists that iron availability controls the productivity and species composition of planktonic organisms in open oceans and coastal and estuarine environments. The mechanisms by which iron is rendered available and induces growth remain unclear but appear to involve, in many instances, light and both generic and specific organic complexants of iron. In this study, we investigate the effect of selected naturally occurring complexants on redox transformations of iron with particular emphasis given to the potential ability of organics and light to increase the bioavailability of iron.Read moreRead less
A palaeoenvironmental reconstruction of Holocene coastal valley evolution in NSW: A magnetic, geochemical, sedimentological and microfossil investigation. Coastal environments are a critical interface between land and ocean. They are sensitive to sea level change and they can influence climate because they trap a large fraction of the carbon buried annually in the oceans. We propose an inter-disciplinary investigation to determine how NSW coastal environments responded to past climate change. Th ....A palaeoenvironmental reconstruction of Holocene coastal valley evolution in NSW: A magnetic, geochemical, sedimentological and microfossil investigation. Coastal environments are a critical interface between land and ocean. They are sensitive to sea level change and they can influence climate because they trap a large fraction of the carbon buried annually in the oceans. We propose an inter-disciplinary investigation to determine how NSW coastal environments responded to past climate change. This will help to understand factors such as flood chronologies and acid sulphate soil potential and to predict the response to these environments to future climate change. Coastal environments support an increasing global population that will benefit from a better understanding of processes and responses within this critical zone.Read moreRead less
Chemistry of the Archaean Ocean and its Impact on Earth's Early Atmosphere and Ecosystems. The Pilbara Craton (WA) contains some of the oldest and best preserved Archaean rocks and microfossils in the world. These rocks, which were recently drilled as part of a collaborative effort between France and Australia, present an unprecedented opportunity to study the composition of the Earth's early atmosphere, ocean and life. The research will strengthen Australia's strategic links with international ....Chemistry of the Archaean Ocean and its Impact on Earth's Early Atmosphere and Ecosystems. The Pilbara Craton (WA) contains some of the oldest and best preserved Archaean rocks and microfossils in the world. These rocks, which were recently drilled as part of a collaborative effort between France and Australia, present an unprecedented opportunity to study the composition of the Earth's early atmosphere, ocean and life. The research will strengthen Australia's strategic links with international experts and will provide access to the state-of-the-art synchrotron facility in France. The project links fundamental processes that shaped the Earth and thus fits into National Research Priority 1: An Environmentally Sustainable Australia.Read moreRead less
The Impact of Trawling on Nitrogen Removal through Sediment Denitrification in Western Moreton Bay. Nutrient enrichment of coastal waters is a national problem requiring urgent action. Sediment denitrification is one of the few natural processes capable of counteracting the process of eutrophication. Although trawling is undertaken in coastal water bodies around Australia the impact on sediment denitrification and the nitrogen budgets of coastal systems has never been considered. Many hundred's ....The Impact of Trawling on Nitrogen Removal through Sediment Denitrification in Western Moreton Bay. Nutrient enrichment of coastal waters is a national problem requiring urgent action. Sediment denitrification is one of the few natural processes capable of counteracting the process of eutrophication. Although trawling is undertaken in coastal water bodies around Australia the impact on sediment denitrification and the nitrogen budgets of coastal systems has never been considered. Many hundred's of millions of dollars are likely to be spent over the next ten years on the management of nitrogen enrichment of Australia's coastal waters. This study will quantify the impact of trawling on sediment denitrification; information which is critical for the efficient allocation of management resources.Read moreRead less
BauxsolTM based grouts and shotcretes for the control of acid rock drainage. Acid rock drainage (ARD) occurs where sulphides (mostly pyrite, but also sulphides of other metals) are exposed to oxygen and water; the estimated global liability from ARD is over US$300 billion. There is currently no cost-effective way to prevent the release of acid and heavy metals from exposed sulphide minerals especially at abandoned mine sites. This study investigates the use of BASECONTM transformed bauxite refin ....BauxsolTM based grouts and shotcretes for the control of acid rock drainage. Acid rock drainage (ARD) occurs where sulphides (mostly pyrite, but also sulphides of other metals) are exposed to oxygen and water; the estimated global liability from ARD is over US$300 billion. There is currently no cost-effective way to prevent the release of acid and heavy metals from exposed sulphide minerals especially at abandoned mine sites. This study investigates the use of BASECONTM transformed bauxite refinery residues (BauxsolTM) to grout waste rock dumps and tailings dams and to develop concretes that can be sprayed on open cut walls and floor to prevent and treat the ARD as it is formed.Read moreRead less
Rich Cousin, Poor Cousin - What Controls the Formation and Size of Orogenic Gold Deposits? What are the geological and geochemical factors that control the formation and size of gold deposits in Phanerozoic mountain belts (?orogens?)? The answer to this question lies in a combination of methods we will use to establish the importance of source, absolute timing of mineralisation, genetic links to magmas, and geochemical processes that result in the transport, and deposition of gold in three separ ....Rich Cousin, Poor Cousin - What Controls the Formation and Size of Orogenic Gold Deposits? What are the geological and geochemical factors that control the formation and size of gold deposits in Phanerozoic mountain belts (?orogens?)? The answer to this question lies in a combination of methods we will use to establish the importance of source, absolute timing of mineralisation, genetic links to magmas, and geochemical processes that result in the transport, and deposition of gold in three separate, geologically young orogens. The wider implications of this research include a greatly improved understanding of lesser known Phanerozoic orogenic gold provinces, ore genesis at convergent plate margins, and the formation of gold deposits in older terrains.Read moreRead less
The behaviour of geochemical tracers during differentiation of the Earth. This project is aimed at providing fundamental data which Earth Scientists will use to understand the processes by which the Earth separated into its chemically-distinct layers (core, mantle, crust, atmosphere, oceans) and to determine the nature of the continuing interactions between the surface environment in which we live and the deep interior. It will provide training in modern high temperature-high pressure materials- ....The behaviour of geochemical tracers during differentiation of the Earth. This project is aimed at providing fundamental data which Earth Scientists will use to understand the processes by which the Earth separated into its chemically-distinct layers (core, mantle, crust, atmosphere, oceans) and to determine the nature of the continuing interactions between the surface environment in which we live and the deep interior. It will provide training in modern high temperature-high pressure materials-science techniques for Ph.D. students and postdoctoral researchers. This will provide Australia with Earth Scientists who have both traditional skills and the ability to work with Materials Scientists on the synthesis of novel materials under extreme conditions.Read moreRead less
Resolving Critical Knowledge Gaps Relating to Light and Free-Radical Mediated Transformations of Iron and Copper in Oxic Natural Waters. Understanding the transformation kinetics of iron and copper species is critical to maintaining Australia's water resources since i) iron transformations are key to generation and transport of acid in Australia's coastal environment; ii) growth of toxic algae are stimulated by dissolution of iron-rich sediments with subsequent release of nutrients phosphorus an ....Resolving Critical Knowledge Gaps Relating to Light and Free-Radical Mediated Transformations of Iron and Copper in Oxic Natural Waters. Understanding the transformation kinetics of iron and copper species is critical to maintaining Australia's water resources since i) iron transformations are key to generation and transport of acid in Australia's coastal environment; ii) growth of toxic algae are stimulated by dissolution of iron-rich sediments with subsequent release of nutrients phosphorus and iron, and iii) algal toxicity is related to iron and copper nutrition and interplay of these metals with oxygen. Additionally, global cycles of carbon, phosphorus and nitrogen are influenced by iron and copper interactions with light and oxygen. Improved understanding of these processes should lead to an awareness of how to prevent these problems and, if they occur, approaches to their mitigation.Read moreRead less
Origin and Evolution of the Earth's Chemical Reservoirs. The scientific aims of this project are to understand the processes by which the Earth separated into its chemically-distinct layers (core, mantle, crust, atmosphere, oceans) and to determine the nature of the continuing interactions between the surface environment in which we live and the deep interior. Experimental study of these processes will involve establishment of a world-class facility for materials synthesis at high pressures and ....Origin and Evolution of the Earth's Chemical Reservoirs. The scientific aims of this project are to understand the processes by which the Earth separated into its chemically-distinct layers (core, mantle, crust, atmosphere, oceans) and to determine the nature of the continuing interactions between the surface environment in which we live and the deep interior. Experimental study of these processes will involve establishment of a world-class facility for materials synthesis at high pressures and temperatures. This facility will provide the means to simulate the processes occurring within the Earth and will enable synthesis of new high density materials of technological interest.Read moreRead less