Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Gold transport in hydrothermal fluids: Competition among the Cl-, Br-, HS- and NH3(aq) ligands

    Access Status
    Fulltext not available
    Authors
    Liu, W.
    Etschmann, B.
    Testemale, D.
    Hazemann, J.
    Rempel, Kirsten
    Müller, H.
    Brugger, J.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Liu, W. and Etschmann, B. and Testemale, D. and Hazemann, J. and Rempel, K. and Müller, H. and Brugger, J. 2014. Gold transport in hydrothermal fluids: Competition among the Cl-, Br-, HS- and NH3(aq) ligands. Chemical Geology. 376: pp. 11-19.
    Source Title
    Chemical Geology
    DOI
    10.1016/j.chemgeo.2014.03.012
    ISSN
    0009-2541
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/10611
    Collection
    • Curtin Research Publications
    Abstract

    Since the Au(I) and Au(III) ions are not stable in water, gold transport and deposition in hydrothermal ore fluids are dependent on the identity and stability of the predominant aqueous gold complexes. Gold(I) bisulfide (e.g., Au(HS)2 -) and in some instances Au(I) chloride complexes are widely acknowledged to account for gold transport in hydrothermal ore fluids. This study investigates the potential of the unconventional ligands Br- and NH3(aq) to increase gold mobility. This was achieved by determining the predominant gold species in hydrothermal fluids with binary mixed ligands (Br-–Cl-, Br-–HS-, HS-–NH3), and measuring their structural properties using in situ synchrotron X-ray absorption spectroscopy (XAS). The capacity of XAS to follow the progress of ligand exchange reactions was demonstrated using Au(III) at room temperature: the Au(III)Br4 - complex was found to predominate in mixed Br-–Cl- solutions (Br-/Cl- = 0.2–1), with average ligand numbers derived from XAS data in good agreement with the UV–vis study of Usher et al. (Geochim. Cosmochim. Acta 73, 3359–3380, 2009). At elevated temperatures up to 400 °C at 600 bar, the XA measurements show that Au(I)–HS- complexes are the only stable gold species in mixed HS-–Br- and HS-–NH3 fluids (HS-/Br-=0.1;HS-/NH3 = 0.2), suggesting that hydrosulfide is the most important ligand for gold transport in the hydrothermalfluid under our experimental conditions, i.e., hydrosulfide complexes outcompete bromide, chloride and ammine complexes in S-bearing fluids.

    Related items

    Showing items related by title, author, creator and subject.

    • Crude oils as ore fluids: An experimental in-situ XAS study of gold partitioning between brine and organic fluid from 25 to 250°C
      Crede, L.; Liu, W.; Evans, Katy; Rempel, Kirsten; Testemale, D.; Brugger, J. (2019)
      Organic matter can be associated with mineralization in hydrothermal ore deposits. One hypothesis is that this organic matter represents remnants of organic fluids (crude oils) that were competing with aqueous fluids for ...
    • Ore-forming processes of the daqiao epizonal orogenic gold deposit, west qinling orogen, China: Constraints from textures, trace elements, and sulfur isotopes of pyrite and marcasite, and raman spectroscopy of carbonaceous material
      Wu, Y.; Li, J.; Evans, Katy; Koenig, A.; Li, Z.; O Brien, H.; Lahaye, Y.; Rempel, Kirsten; Hu, S.; Zhang, Z.; Yu, J. (2018)
      The Daqiao gold deposit is hosted in organic-rich Triassic pumpellyite-actinolite facies metamorphosed turbidites in the West Qinling orogen, central China. Gold mineralization is characterized by high-grade hydraulic ...
    • Gold partitioning between 1-dodecanethiol and brine at elevated temperatures: Implications of Au transport in hydrocarbons for oil-brine ore systems
      Crede, L.; Evans, Katy; Rempel, Kirsten; Grice, Kliti; Sugiyama, I. (2019)
      Gold is can be associated with hydrocarbons in hydrothermal gold deposits, but the near-absence of experimental data on gold-hydrocarbon interactions at hydrothermal conditions prevents a quantitative interpretation of ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.