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

    Experimental study of the carbonation of partially serpentinized and weathered peridotites

    Access Status
    Fulltext not available
    Authors
    Hövelmann, J.
    Austrheim, H.
    Beinlich, Andreas
    Anne Munz, I.
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Hövelmann, J. and Austrheim, H. and Beinlich, A. and Anne Munz, I. 2011. Experimental study of the carbonation of partially serpentinized and weathered peridotites. Geochimica et Cosmochimica Acta. 75 (22): pp. 6760-6779.
    Source Title
    Geochimica et Cosmochimica Acta
    DOI
    10.1016/j.gca.2011.08.032
    ISSN
    0016-7037
    School
    The Institute for Geoscience Research (TIGeR)
    URI
    http://hdl.handle.net/20.500.11937/12908
    Collection
    • Curtin Research Publications
    Abstract

    Carbonation of partially serpentinized and weathered peridotites was studied experimentally under hydrothermal conditions (T: 200°C, PCO2: 130-180bars). Experiments were performed in a closed system using whole rock drill core samples (height: 1cm, diameter: 1cm) as starting material. The initial samples were composed mainly of meshwork serpentine, relicts of primary olivine and an olivine weathering product (deweylite assemblage). Two types of solutions, each with a total salt content corresponding to that of average seawater (35g/L dissolved salts), were used: (1) a Na-Ca-Cl solution (12.5g/L CaCl2+22.5g/L NaCl) and (2) a NaCl solution (35g/L NaCl). After 15-25days of experimental treatment, the samples were partly covered with carbonates. In addition, noticeable carbonation reactions had occurred below the sample surfaces within zones with thicknesses up to 250µm. In the Na-Ca-Cl solution, both the olivine relicts and the deweylite assemblage were partly replaced by calcite along the surrounding serpentine veins. However, the extent of calcitization was found to be considerably larger for the deweylite assemblage than for the olivine. Bulk fluid analyses show an increase in the Mg and Si concentrations with reaction time. In the NaCl solution, the deweylite assemblage was partly dissolved resulting in large voids within the reaction zone. In contrast, the olivine was replaced by magnesite. Under the conditions of our experiments, the meshwork serpentine was not reactive, but aided fluid infiltration into the rock samples. The experimentally produced microtextures closely resemble those found in natural examples. Our study elucidates the mechanisms by which carbonates form in ultramafic rocks under relatively high PCO2-T conditions and particularly in the presence of Ca-bearing aqueous solutions. The existence of a serpentine meshtexture and the presence of weathering products formed from primary Mg-silicates may have significant beneficial effects on in situ CO2 mineral sequestration in ultramafic rocks. © 2011 Elsevier Ltd.

    Related items

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

    • The process of serpentinization in dunite from New Caledonia
      Frost, B.; Evans, Katy; Swapp, S.; Beard, J.; Mothersole, Fiona (2013)
      Dunite from New Caledonia displays three types of serpentine-dominated veins. The earliest, type 1 veins are narrow (50–100 μm wide) and rarely extend across more than a single olivine grain. They are lizardite, contain ...
    • Surface specific measurements of olivine dissolution by phase-shift interferometry
      King, H.E.; Satoh, H.; Tsukamoto, K.; Putnis, Andrew (2014)
      Natural olivine dissolution and replacement often occurs preferentially along specific crystallographic planes. Thus, olivine reactivity at specific surfaces was examined in situ using phase-shift interferometry, which ...
    • Subarctic physicochemical weathering of serpentinized peridotite
      Ulven, O.; Beinlich, Andreas; Hövelmann, J.; Austrheim, H.; Jamtveit, B. (2017)
      Frost weathering is effective in arctic and subarctic climate zones where chemical reactions are limited by the reduced availability of liquid water and the prevailing low temperature. However, small scale mineral dissolution ...
    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.