A5025135647- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- earthquake and tectonic studies
- Metal Extraction and Bioleaching
- Minerals Flotation and Separation Techniques
- Mine drainage and remediation techniques
- Mineral Processing and Grinding
- Mineralogy and Gemology Studies
- Hydrocarbon exploration and reservoir analysis
- Heavy metals in environment
- Geophysical and Geoelectrical Methods
- Construction Engineering and Safety
- Geological and Geophysical Studies
- Geomagnetism and Paleomagnetism Studies
- High-pressure geophysics and materials
- Planetary Science and Exploration
- Geological and Geophysical Studies Worldwide
- Extraction and Separation Processes
- Geology and Paleoclimatology Research
- Mining Techniques and Economics
- Astro and Planetary Science
- Clay minerals and soil interactions
- Marine and environmental studies
University of Tasmania
2015-2024
Australian Research Council
2019
Iowa State University
2010-2015
Faced with ongoing depletion of near-surface ore deposits, geologists are increasingly required to explore for deep deposits or those lying beneath surface cover. The result is increased drilling costs and a need maximize the value drill hole samples collected. Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analysis pyrite one tool that showing promise in exploration. Since trace element content approximates composition fluid from which it precipitated...
The Kapai Slate is a continuous, pyrite-rich carbonaceous shale horizon within the St. Ives Au district that spatially related to high-grade mineralization. In situ laser ablation-inductively coupled mass spectrometry (LA-ICPMS) trace element analyses, in sensitive high resolution ion microprobe, stable isotope (SHRIMP-SI) S and optical microscopy pyrite texture analyses were used examine different types deposits. These data also confirm signature of sedimentary can be preserved rocks...
Trace element concentrations in marine pyrite, measured by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), have the potential to open a new window into deep-time ocean chemistry, atmosphere oxygenation, and genesis of basin-hosted ore deposits. Only early-formed syngenetic early diagenetic pyrite preserves trace chemistry past oceans, as late metamorphic recrystallization changes budget. A database over 5,000 analyses LA-ICP-MS has enabled development proxies for...
Abstract The origins of magnetite-apatite deposits are controversial, and the crux debate is what types fluids form these rocks. We present evidence from 20 worldwide showing ubiquitous involvement molten salts. studied distributed globally, various tectonic settings, Precambrian to Quaternary in age. In every case, water-poor polycrystalline melt inclusions ore-stage minerals dominated by sulfate, chloride, carbonate components plus variable proportions calc-silicates, phosphates, iron ±...
Research Article| August 01, 2015 Synsedimentary to Early Diagenetic Gold in Black Shale-Hosted Pyrite Nodules at the Golden Mile Deposit, Kalgoorlie, Western Australia Jeffrey A. Steadman; Steadman † 1CODES (ARC Centre of Excellence Ore Deposits), School Physical Sciences, University Tasmania, Private Bag 79, Hobart, Tasmania 7001 †Corresponding author: e-mail, jeff.steadman@utas.edu.au Search for other works by this author on: GSW Google Scholar Ross R. Large; Large Sebastien Meffre;...
The Paleoproterozoic Homestake deposit, northern Black Hills, South Dakota, is the largest banded iron-formation (BIF)-hosted gold deposit in world and one of single deposits globally (~1,300 t Au mined at an average grade 8.4 g/t). origin has remained dispute from its discovery, with views broadly falling into two groups: (1) associated elements were externally sourced deposited a suitable structural and/or chemical trap (e.g., iron formation), (2) was indigenous to host formation, which it...
Hydrothermal magnetite from the Starra iron oxide‑copper gold (IOCG) deposit in northwest Queensland, Australia, records a gradual decrease V, Ni, Cr, and Mn that correlates with transition early, amphibole-biotite-magnetite dominant alteration to late, chlorite-quartz-hematite-dominated assemblages. The observed systematic change multivariate elements is interpreted indicate an increase fO2 during main Cu(Au) mineralization. We suggest variations Cr contents of at either primary magmatic...
The great oxygenation event (GOE), the first of two major rises in atmospheric oxygen Earth history, was initially placed near Archean-Proterozoic boundary (∼2500 Ma). More recently, position GOE has been moved to between 2500 and 2300 Ma so as coincide with loss MIF sulfur isotope signal due creation Earth's ozone layer at that time. Here we present a revised interpretation history Archean Proterozoic, based on multi-geochemical proxy approach. Integration large database analyses redox...
On the basis of geochemical and mineralogical features, Ballouard et al. (2016) argue that magmatic fractionation alone cannot explain the formation leucogranites with low Nb/Ta ratios. Instead, they propose ratios are better explained by post-magmatic interaction F-bearing fluids. Although fluids may certainly play an important role in rare metal leucogranites, the model proposed Ballouard et lacks key details. We contend that the principal features they attribute to...
Sulfur is an essential element of life that assimilated by Earth’s biosphere through the chemical breakdown pyrite. On early Earth, pyrite weathering atmospheric oxygen was severely limited, and low marine sulfate concentrations persisted for much Archean eon. Here, we show anoxic photochemical mechanism could have provided substantial amounts to oceans as continents formed in late Archean. Pyrite grains suspended ferrous iron solutions produced millimolar when irradiated with ultraviolet...
Four economic porphyry Cu–Au deposits and several prospects have been investigated in the Northparkes district, part of Ordovician to early Silurian Junee–Narromine Belt Macquarie Arc, New whole-rock geochemical data from NSW, indicate that mineralising intrusive complexes exhibit distinct arc signatures are transitional high-K calc-alkaline silica-saturated alkalic. Based on ratios Sr/Y vs Y (e.g. > ∼20 < ∼17 ppm) intrusions interpreted crystallised fractionated hydrous melts indicating...