Geochemistry of ore metals at very high temperatures. The world’s largest copper and gold mines occur in extinct volcanoes around the Pacific Rim. Understanding how these essential metals are mobilised from magmas in the roots of volcanoes to become ore deposits and how to recognize where this has occurred is crucial in exploration for new deposits.
Hydrothermal remobilisation of base metals and platinum group elements in magmatic nickel deposits. Magmatic nickel sulphide deposits are highly valuable but extremely challenging exploration targets, thought to lack the distinctive geochemical haloes that allow small targets to be identified from sparse drilling. The project will test the potential of hydrothermal remobilisation of nickel, cobalt and platinum group elements to create broad alteration haloes.
Hydrogen generation by subsurface iron mineral transformations. Aim
The aim of this project is to elucidate key factors responsible for natural hydrogen generation in Australian subsurface environments.
Significance
Large amounts of this valuable resource are produced naturally with estimates of production rates of this “gold” hydrogen at least 100 times the annual demand for this critical resource.
Expected Outcomes
Based on improved understanding of the source of natural hydrogen, predictive ....Hydrogen generation by subsurface iron mineral transformations. Aim
The aim of this project is to elucidate key factors responsible for natural hydrogen generation in Australian subsurface environments.
Significance
Large amounts of this valuable resource are produced naturally with estimates of production rates of this “gold” hydrogen at least 100 times the annual demand for this critical resource.
Expected Outcomes
Based on improved understanding of the source of natural hydrogen, predictive tools will be developed that will assist in assessing the viability in Australia of hydrogen exploration and engineered retrieval.
Benefits
Ready access to naturally produced hydrogen could enable Australia to replace hydrogen that is currently generated via the use of unabated hydrocarbons.Read moreRead less
The geochemistry of trace elements with variable oxidation states. The understanding of many earth processes is based upon an interpretation of differences in the relative abundance and/or distribution of elements which occur in more than one oxidation state. However, the redox states that control the geochemical behaviour of an element in a melt are not necessarily retained on cooling. This work aims to determine the oxidation states of geologically important elements, in situ under magmatic ....The geochemistry of trace elements with variable oxidation states. The understanding of many earth processes is based upon an interpretation of differences in the relative abundance and/or distribution of elements which occur in more than one oxidation state. However, the redox states that control the geochemical behaviour of an element in a melt are not necessarily retained on cooling. This work aims to determine the oxidation states of geologically important elements, in situ under magmatic conditions, using XANES spectroscopy. The results will allow geological signatures to be correctly interpreted and allow models for topics ranging from ancient mantle temperatures to rates of melt migration to be better constrained.Read moreRead less
The composition and transport of Australian air-borne dust: critical to continental and marine environments. This project will determine the composition of Australian airborne dust and effects on the environment and in particular soils, rainforests and the marine realm, including reefs. 'Fingerprinting' the chemical and microbiological content of aeolian dust is of particular relevance to determining its impact on the health of the Australian people and environment. Atmospheric conditions propit ....The composition and transport of Australian air-borne dust: critical to continental and marine environments. This project will determine the composition of Australian airborne dust and effects on the environment and in particular soils, rainforests and the marine realm, including reefs. 'Fingerprinting' the chemical and microbiological content of aeolian dust is of particular relevance to determining its impact on the health of the Australian people and environment. Atmospheric conditions propitious for dust entrainment and transport will be determined, and in particular atmospheric exchanges between Indonesia, southern Africa and Australia will be established. The relevance of aeolian dust to climate, ecosystems and biosecurity in our region will be established through the study of marine and lacustrine cores.Read moreRead less
The hydrothermal solubility of molybdenum: A LA-ICPMS study of synthetic and natural fluid inclusions. The solubility of molybdenum under magmatic-hydrothermal conditions is essentially unknown. This study will, for the first time, identify the fundamental controls on molybdenum solubility in porphyry systems. This information will provide geologists with basic information on the transport and deposition of this important ore metal. In an allied study, the ore metals; copper, gold and molybdenum ....The hydrothermal solubility of molybdenum: A LA-ICPMS study of synthetic and natural fluid inclusions. The solubility of molybdenum under magmatic-hydrothermal conditions is essentially unknown. This study will, for the first time, identify the fundamental controls on molybdenum solubility in porphyry systems. This information will provide geologists with basic information on the transport and deposition of this important ore metal. In an allied study, the ore metals; copper, gold and molybdenum, will be traced through the Kidston porphyry system, Queensland. This will clarify the processes that lead to ore deposition, which will ultimately allow geologists to more effectively explore for porphyry-type deposits, a major target for Australian mining companies in the Pacific region.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
Magnetite and metal-rich sulphides in arc magmas. Ascending magmas cool and crystallise a variety of minerals. Triggering sulfide deposition which hosts base and precious metals is a critical point in magma evolution. This research will explore the role of magnetite as this trigger and its potential as a tracer of this process.
Aqueous fluids in the deep earth. This project aims to improve our understanding of the role of fluids in controlling exchanges between the deep Earth, shallow rocks, and atmosphere. The project expects to investigate some of the key weaknesses in the thermodynamic models that are used to predict the behaviour of sulphur, carbon and metals in fluids at high pressure and temperature by using recent advances in computational and experimental (geo)chemistry. Integrated in large-scale geodynamic mod ....Aqueous fluids in the deep earth. This project aims to improve our understanding of the role of fluids in controlling exchanges between the deep Earth, shallow rocks, and atmosphere. The project expects to investigate some of the key weaknesses in the thermodynamic models that are used to predict the behaviour of sulphur, carbon and metals in fluids at high pressure and temperature by using recent advances in computational and experimental (geo)chemistry. Integrated in large-scale geodynamic models, the more reliable predictions will provide a more realistic assessment of the role of sulphur in controlling metal endowment and atmospheric chemistry through geological times. This should provide a useful guide for mineral exploration and planetary science.Read moreRead less