Rates of metamorphic processes - correlating U-Pb ages with the pressure-temperature conditions of mineral growth. To determine the speed of metamorphic processes, the age obtained from accessory uranium-bearing minerals will be correlated to pressure and temperature obtained from major rock forming minerals. I will develop a new and innovative technique that uses trace element geochemistry to provide this link. The trace element partitioning between datable minerals (zircon, monazite and titani ....Rates of metamorphic processes - correlating U-Pb ages with the pressure-temperature conditions of mineral growth. To determine the speed of metamorphic processes, the age obtained from accessory uranium-bearing minerals will be correlated to pressure and temperature obtained from major rock forming minerals. I will develop a new and innovative technique that uses trace element geochemistry to provide this link. The trace element partitioning between datable minerals (zircon, monazite and titanite) and key metamorphic minerals will be investigated in natural samples and in piston cylinder experiments. I will apply this technique to the study of processes such as the exhumation of eclogites in subduction zones and the duration of granulite-facies metamorphism in lower crustal rocks.Read moreRead less
Proterozoic crustal evolution of the Northern Australian Craton revealed from hafnium-oxygen isotope systematics of granite-hosted and detrital zircons. This project will provide an detailed view of continental crust formation during a key period of Earth's history. Through an innovative approach and the use of sophisticated micro-analytical techniques, it will enhance the profile and global competitiveness of Australian research. The project is an integral part of a national collaboration on Pr ....Proterozoic crustal evolution of the Northern Australian Craton revealed from hafnium-oxygen isotope systematics of granite-hosted and detrital zircons. This project will provide an detailed view of continental crust formation during a key period of Earth's history. Through an innovative approach and the use of sophisticated micro-analytical techniques, it will enhance the profile and global competitiveness of Australian research. The project is an integral part of a national collaboration on Proterozoic terranes involving universities, Geoscience Australia and state geological surveys, and datasets generated by this study can potentially lead to refined mineral exploration strategies. The project is linked to the development of a major new analytical facility at James Cook University that will support local and international research and research training.Read moreRead less
Early Archaean Ecology - Exploring the Evidence and Habitats for Early (3.6-3.85 billion year old) Life. The prime scientific quest of the 21st century will be the origin of life. The earliest evidence for life is at 3.85 Ga (billion-years) in the world's oldest-known sediments from Akilia, Greenland. These rocks were contorted and heated during later crustal upheavals, and the evidence for life at 3.85 Ga is controversial. Such life would be highly significant, because then first, primitive li ....Early Archaean Ecology - Exploring the Evidence and Habitats for Early (3.6-3.85 billion year old) Life. The prime scientific quest of the 21st century will be the origin of life. The earliest evidence for life is at 3.85 Ga (billion-years) in the world's oldest-known sediments from Akilia, Greenland. These rocks were contorted and heated during later crustal upheavals, and the evidence for life at 3.85 Ga is controversial. Such life would be highly significant, because then first, primitive life arose before the known stratigraphic record. The project will extend the methods used to detect earliest life, and use Greenland rocks to explore other possible early habitats (submarine volcanic rocks and hot springs) and understand its environment.Read moreRead less
Storage of Volatiles in the Mantle Lithosphere: Time-scales, sources and processes. Fragments of the Earth's mantle (xenoliths), transported to surface by deep-seated volcanics, record the injection of fluids through formation of volatile-bearing minerals (mantle metasomatism). This project will 1) test the hypothesis that timescales of mantle volatile storage can be determined using noble gas (laser probe) dating techniques, and 2) determine the sources and processes involved in volatile stor ....Storage of Volatiles in the Mantle Lithosphere: Time-scales, sources and processes. Fragments of the Earth's mantle (xenoliths), transported to surface by deep-seated volcanics, record the injection of fluids through formation of volatile-bearing minerals (mantle metasomatism). This project will 1) test the hypothesis that timescales of mantle volatile storage can be determined using noble gas (laser probe) dating techniques, and 2) determine the sources and processes involved in volatile storage, using halogen and noble gas geochemistry. A successful outcome will establish unique methods for dating mantle metasomatic events and determine the relationship between mantle and crust melting episodes, thus providing critical constraints on mantle evolution and Earth degassing models. Read moreRead less
In search of the sources of southeastern Australian granites: a Hf, O and U-Pb isotopic study of single zircons. Some researchers suggest that the composition of granites can be used to map their source regions 15-35 km below the Earth's surface; others disagree. Our research is designed to resolve the matter, providing a firmer basis for using granite compositions to infer crustal structure and assist in mineral exploration. The research will require the development of new analytical techniques ....In search of the sources of southeastern Australian granites: a Hf, O and U-Pb isotopic study of single zircons. Some researchers suggest that the composition of granites can be used to map their source regions 15-35 km below the Earth's surface; others disagree. Our research is designed to resolve the matter, providing a firmer basis for using granite compositions to infer crustal structure and assist in mineral exploration. The research will require the development of new analytical techniques which will greatly enhance the capacity of SHRIMP, a uniquely Australian frontier technology, in a variety of new fields, e.g. biology, environmental studies and ore genesis, each of which ultimately contributes to the social and economic well-being of the Australian community.Read moreRead less
The Role of Water in Precambrian Ultramafic Magmatism: Insights from an In-Situ Microbeam and Nanobeam Assessment of Hydromagmatic Amphibole. Hydromagmatic amphibole in some Precambrian (>600 million years old) komatiites and other ultramafic rocks in Australia, Canada and Russia indicates >3% water in the parental magmas. This magmatic water could be crustal or mantle in origin. Constraints on the water source would profoundly impact concepts of Precambrian crustal evolution and water recycling ....The Role of Water in Precambrian Ultramafic Magmatism: Insights from an In-Situ Microbeam and Nanobeam Assessment of Hydromagmatic Amphibole. Hydromagmatic amphibole in some Precambrian (>600 million years old) komatiites and other ultramafic rocks in Australia, Canada and Russia indicates >3% water in the parental magmas. This magmatic water could be crustal or mantle in origin. Constraints on the water source would profoundly impact concepts of Precambrian crustal evolution and water recycling. The ultimate goal of this project is to provide constraints on the role of water in early Earth magmatism, through in situ microbeam and nanobeam analysis of the amphibole to produce an integrated trace element and isotopic dataset for geologically and chemically diverse types of Precambrian ultramafic rocks.Read moreRead less
Tracking mass transport during metamorphism using in situ micro-analysis of minerals. The continental masses we inhabit developed in response to the colossal forces of plate tectonics. Through compression and heating, rocks of the crust can experience fluid loss or melting. Movement of these fluids or magmas can, among other things, impact on the heat budget of Earth, the carbon and water cycles and the formation of ores in the crust. This project will utilize state-of-the-art scientific instrum ....Tracking mass transport during metamorphism using in situ micro-analysis of minerals. The continental masses we inhabit developed in response to the colossal forces of plate tectonics. Through compression and heating, rocks of the crust can experience fluid loss or melting. Movement of these fluids or magmas can, among other things, impact on the heat budget of Earth, the carbon and water cycles and the formation of ores in the crust. This project will utilize state-of-the-art scientific instruments and methods to greatly improve our understanding of these issues, which, in turn, will enhance our knowledge of how the Earth's crust develops. Research training and development will be provided through two PhD projects supported through this project.Read moreRead less
Toward the use of metal stable isotopes in geosciences. Metal stable isotopes (MSI: Mg, Fe, Cu, Zn, Ga) have enormous potential applications (basic and applied) in Geosciences and beyond. However the use of these elements as geochemical tracers and petrogenetic tools requires: (1) the definition of their isotopic composition in Earth key reservoirs and in reference materials such as the chondritic meteorites; (2) Understanding and quantification of the causes of MSI fractionations during geolog ....Toward the use of metal stable isotopes in geosciences. Metal stable isotopes (MSI: Mg, Fe, Cu, Zn, Ga) have enormous potential applications (basic and applied) in Geosciences and beyond. However the use of these elements as geochemical tracers and petrogenetic tools requires: (1) the definition of their isotopic composition in Earth key reservoirs and in reference materials such as the chondritic meteorites; (2) Understanding and quantification of the causes of MSI fractionations during geological processes. By a unique combination of in-situ and solution geochemical analytical techniques avaliable now through frontier technology and method development we aim to establish a conceptual and theoretical framework for the use of MSI in Geosciences.Read moreRead less
Diamond genesis: cracking the code for deep-Earth processes. The project will provide new insights into the processes by which diamond crystallises in the Earth's mantle, and will deliver information directly relevant to interpreting the diamond prospectivity of the Australian continent. The development of a new diamond mine in Australia, or by Australian companies abroad, would be a major addition to the economy and Australian-based industry. Another outcome of this research will be further de ....Diamond genesis: cracking the code for deep-Earth processes. The project will provide new insights into the processes by which diamond crystallises in the Earth's mantle, and will deliver information directly relevant to interpreting the diamond prospectivity of the Australian continent. The development of a new diamond mine in Australia, or by Australian companies abroad, would be a major addition to the economy and Australian-based industry. Another outcome of this research will be further development of methodologies for identification of sources of individual diamonds, relevant to the international Kimberley Process for reducing theft and illegal diamond trade. The project will be a highly visible Australian contribution to this global social and economic problem.Read moreRead less
Application of very short-lived Uranium-series isotopes to constraining Earth system processes. This proposal is directly concerned with the continuing aim of building a sustainable Australia through knowledge of deep earth resources. Uranium series isotopes are relevant to the very recent history of the planet (< 350 000 years) - time scales which are often over-looked. The more we know about the rates of processes the better we will be able to inform models for volcanic hazard mitigation, soil ....Application of very short-lived Uranium-series isotopes to constraining Earth system processes. This proposal is directly concerned with the continuing aim of building a sustainable Australia through knowledge of deep earth resources. Uranium series isotopes are relevant to the very recent history of the planet (< 350 000 years) - time scales which are often over-looked. The more we know about the rates of processes the better we will be able to inform models for volcanic hazard mitigation, soil sustainability and resource exploration and safeguarding. It is to these techniques we must look if we are to understand the immediate past as a clue to the immediate future of our planet.Read moreRead less