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TitleGeological setting of listwanite (carbonated serpentinite) at Atlin, British Columbia: implications for CO2 sequestration and lode-gold mineralization
AuthorHansen, L D; Anderson, R G; Dipple, G M; Nakano, K
SourceGeological Survey of Canada, Current Research (Online) no. 2004-A5, 2004, 12 pages, (Open Access)
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in Geological Survey of Canada; (2005). Current Research 2004, January-December 2004, Geological Survey of Canada, Current Research no. 2004, ed. version 2
File formatpdf
ProvinceBritish Columbia
Lat/Long WENS-134.0000 -133.5000 59.7500 59.5000
Subjectseconomic geology; igneous and metamorphic petrology; geochemistry; mineralogy; Nature and Environment; gold; mineralization; serpentinites; carbon dioxide; alteration; igneous rocks; ultramafic rocks; petrography; geochemical analyses; magnetism; Atlin Ophiolitic Assemblage; listwanite; carbonation
Illustrationssketch maps; photographs; stereonets; magnetic maps; photomicrographs; tables
Released2004 12 01
AbstractCarbonate-altered serpentinite (listwanite) is commonly associated with gold mineralization, but also binds large quantities of the greenhouse gas carbon dioxide. At Atlin, listwanite alteration progressed through three carbonation reactions that resulted in the same overall mineral transformations as proposed for the industrial sequestration of anthropogenic CO2 by the process of mineral carbonation.
Therefore, alteration of serpentinite to listwanite serves as a natural analogue to CO2 sequestration. Listwanite alteration is concentrated along faults and two orthogonal fracture sets, and extends tens of metres into the wall rock. One fracture orientation is preferentially mineralized. The carbonation reactions most distal to the fracture system consume olivine and brucite, and record grain-scale percolation of CO2-bearing fluids into serpentinite hundreds of metres from visible carbonate alteration. These previously unrecognized reactions may be relevant for in situ CO2 sequestration. Extensive carbonation in the carbonate alteration systems generated fracture permeability that promoted further infiltration and may have accelerated carbonation and gold mineralization.