ORCID Profile
0000-0001-6251-3483
Current Organisation
CSIRO
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Inorganic Geochemistry | Geochemistry | Geodynamics
Mineral Exploration not elsewhere classified | Copper Ore Exploration | Climate and Climate Change not elsewhere classified |
Publisher: Elsevier BV
Date: 07-2020
Publisher: Elsevier BV
Date: 02-2013
Publisher: Elsevier BV
Date: 11-2019
Publisher: Wiley
Date: 2009
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 04-2016
Publisher: Elsevier BV
Date: 05-2022
Publisher: Elsevier BV
Date: 12-2012
Publisher: Springer Science and Business Media LLC
Date: 23-05-2019
DOI: 10.1038/S41467-019-10006-5
Abstract: Microbial contribution to gold biogeochemical cycling has been proposed. However, studies have focused primarily on the influence of prokaryotes on gold reduction and precipitation through a detoxification-oriented mechanism. Here we show, fungi, a major driver of mineral bioweathering, can initiate gold oxidation under Earth surface conditions, which is of significance for dissolved gold species formation and distribution. Presence of the gold-oxidizing fungus TA_pink1, an isolate of Fusarium oxysporum , suggests fungi have the potential to substantially impact gold biogeochemical cycling. Our data further reveal that indigenous fungal ersity positively correlates with in situ gold concentrations. Hypocreales, the order of the gold-oxidizing fungus, show the highest centrality in the fungal microbiome of the auriferous environment. Therefore, we argue that the redox interaction between fungi and gold is critical and should be considered in gold biogeochemical cycling.
Publisher: Elsevier BV
Date: 06-2010
DOI: 10.1016/J.ACA.2010.04.064
Abstract: A micro near infrared spectroscopy (MicroNIRS) technique based on monolithic column enrichment has been developed to detect low concentration metallic ions in water. Glycidyl methacrylate-ethylene dimethacrylate-iminodiacetic acid (GMA-EDMA-IDA) monolithic material was synthesized to construct an enrichment device, which can enrich metallic ions more efficiently than chelating resin materials such as D401. Cu(2+) solutions passed through the enrichment device and concentrated on the surface of the material, and then diffuse reflection NIR (DRNIR) spectra were measured by touching the NIR probe on the surface. The spectra were pretreated with multiplicative scatter correction (MSC) and the MSC-pretreated spectra showed high linear correlation to the Cu(2+) concentrations in spectral regions of 900-1350 nm, 1420-1480 nm and 1970-2050 nm for all concentration ranges. PLS models built with leave-one-out cross-validation also yielded good features. The mean relative error (MRE) of prediction was 10.0% in the 0.0001-0.0010 microg mL(-1) range. The concentration has low to ppb-level, but the MRE was not more than 10%, which was acceptable for trace analysis. The results revealed that the MicroNIRS technique enhanced the sensitivity of NIRS dramatically and widened the NIRS technique to micro and trace analysis field.
Publisher: Wiley
Date: 12-2014
Publisher: Elsevier BV
Date: 06-2023
Publisher: Elsevier BV
Date: 12-2020
Publisher: Mineralogical Society of America
Date: 2019
DOI: 10.2138/AM-2019-6719
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 11-2019
Publisher: Society of Economic Geologists
Date: 06-2017
Publisher: Elsevier BV
Date: 03-2014
Publisher: Hindawi Limited
Date: 03-03-2020
DOI: 10.1155/2020/7649713
Publisher: American Chemical Society (ACS)
Date: 08-08-2017
Publisher: Elsevier BV
Date: 07-2015
Publisher: Elsevier BV
Date: 04-2018
Publisher: Hindawi Limited
Date: 2018
DOI: 10.1155/2018/4279124
Abstract: We investigated the hydration of the CuCl 0 complex in HCl-bearing water vapor at 350°C and a vapor-like fluid density between 0.02 and 0.09 g/cm 3 using ab initio molecular dynamics (MD) simulations. The simulations reveal that one water molecule is strongly bonded to Cu(I) (first coordination shell), forming a linear [H 2 O-Cu-Cl] 0 moiety. The second hydration shell is highly dynamic in nature, and in idual configurations have short life-spans in such low-density vapors, resulting in large fluctuations in instantaneous hydration numbers over a timescale of picoseconds. The average hydration number in the second shell ( m ) increased from ~0.5 to ~3.5 and the calculated number of hydrogen bonds per water molecule increased from 0.09 to 0.25 when fluid density (which is correlated to water activity) increased from 0.02 to 0.09 g/cm 3 ( f H 2 O 1.72 to 2.05). These changes of hydration number are qualitatively consistent with previous solubility studies under similar conditions, although the absolute hydration numbers from MD were much lower than the values inferred by correlating experimental Cu fugacity with water fugacity. This could be due to the uncertainties in the MD simulations and uncertainty in the estimation of the fugacity coefficients for these highly nonideal “vapors” in the experiments. Our study provides the first theoretical confirmation that beyond-first-shell hydrated metal complexes play an important role in metal transport in low-density hydrothermal fluids, even if it is highly disordered and dynamic in nature.
Publisher: Elsevier BV
Date: 04-2016
Publisher: Elsevier BV
Date: 02-2015
Publisher: Elsevier BV
Date: 04-2014
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 12-2016
Publisher: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 06-2013
Publisher: Elsevier BV
Date: 12-2018
Publisher: Hindawi Limited
Date: 28-08-2018
DOI: 10.1155/2018/6835346
Abstract: Uranium mineralization is commonly accompanied by enrichment of fluorite and other F-bearing minerals, leading to the hypothesis that fluoride may play a key role in the hydrothermal transport of U. In this paper, we review the thermodynamics of U(IV) and U(VI) complexing in chloride- and fluoride-bearing hydrothermal fluids and perform mineral solubility and reactive transport calculations to assess equilibrium controls on the association of F and U. Calculations of uraninite and U 3 O 8 (s) solubility in acidic F-rich (Cl : F = 100 [ppm-based]) hydrothermal fluids at 25–450°C, 600 bar, show that U(IV)-F complexes (reducing conditions) and uranyl-F complexes (oxidizing conditions) predominate at low temperature ( T ~ 200 °C), while above ~250°C, chloride complexes predominate in acidic solutions. In the case of uraninite, solubility is predicted to decrease dramatically as U(IV)Cl 2 2+ becomes the predominant U species at T 260 °C. In contrast, the solubility of U 3 O 8 (s) increases with increasing temperatures. We evaluated the potential of low-temperature fluids to upgrade U and F concentrations in magnetite-chalcopyrite ores. In our model, an oxidized (hematite-rich) granite is the primary source of F and has elevated U concentration. Hydrothermal fluids (15 wt.% NaCl equiv.) equilibrated with this granite at 200°C react with low-grade magnetite-chalcopyrite ores. The results show that extensive alteration by these oxidized fluids is an effective mechanism for forming ore-grade Cu-U mineralization, which is accompanied by the coenrichment of fluorite. Fluorite concentrations are continuously upgraded at the magnetite-hematite transformation boundary and in the hematite ores with increasing fluid : rock (F/R) ratio. Overall, the model indicates that the coenrichment of F and U in IOCG ores reflects mainly the source of the ore-forming fluids, rather than an active role of F in controlling the metal endowment of these deposits. Our calculations also show that the common geochemical features of hematite-dominated IOCG deposits can be related to a two-phase process, whereby a magnetite-hematite-rich orebody (formed via a number of processes/tectonic settings) is enriched in Cu ± U and F during a second stage (low temperature, oxidized) of hydrothermal circulation.
Publisher: Informa UK Limited
Date: 11-11-2019
Publisher: Elsevier BV
Date: 03-2012
Publisher: Public Library of Science (PLoS)
Date: 02-05-2019
Publisher: Elsevier BV
Date: 08-2023
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 08-2022
Start Date: 2019
End Date: 2021
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2019
End Date: 12-2023
Amount: $450,000.00
Funder: Australian Research Council
View Funded Activity