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TitleGold mineralization during greenhouse gas fixation: a booklet summary of research on Au-bearing listwanite in the Atlin area, northwestern British Columbia
AuthorHansen, L D; Dipple, G M; Anderson, R G
SourceGeological Survey of Canada, Open File 5074, 2006, 7 pages, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia
AreaAtlin; Atlin Lake
Lat/Long WENS-134.0000 -133.5000 59.7500 59.5000
Subjectseconomic geology; igneous and metamorphic petrology; geochemistry; geochronology; surficial geology/geomorphology; Nature and Environment; gold; mineralization; serpentinites; carbon dioxide; alteration; carbonate; igneous rocks; intrusive rocks; volcanic rocks; ultramafic rocks; petrography; geochemical analyses; magnetism; mineral deposits; mineral deposits genesis; chemical processing; chemical processes; magnesite; serpentine; talc; quartz; radiometric dating; stable isotope studies; carbon isotopes; source areas; permeability; magnetic susceptibility; modelling; temperature; basalts; breccias; accretion; metabasalts; dunites; harzburgites; intrusions; dacites; diabases; porphyries; Holocene; drift deposits; hydromagnesite; faults; fractures; decollement; obduction; chromite; muscovite; fluid flow; olivine; oxides; mineral exploration; exploration methods; argon argon dating; Atlin Ophiolitic Assemblage; Fourth of July Batholith; listwanite; mineral carbonation; mineral transformation; carbon dioxide sequestration; anthropogenic pollutants; storage; accretion wedges; Phanerozoic; Cenozoic; Quaternary; Mesozoic; Triassic
Illustrationsdrawings; sketch maps; photographs; flow charts; photomicrographs; block diagrams; stereonets; geophysical maps; ternary diagrams; graphs; Box-and-whisker diagrams
ProgramReducing Canada's Vulnerability to Climate Change
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
ProgramEnvironment Canada, Environmental Aspects of Oil, Gas and Energy Branch, Funding Program
ProgramClimate Change Action Fund (CCAF)
Released2006 03 01; 2008 10 29
AbstractListwanite (carbonate-altered serpentinite) is commonly spatially associated with gold mineralization; it also represents a natural analogue to mineral carbonation, a type of carbon dioxide sequestration. Our studies have resulted in a better understanding of listwanite associated lode-gold deposits and will aid in the design of industrial processes aimed at permanently and safely storing anthropogenic carbon dioxide. Mapping and sampling at Atlin, BC shows that listwanite-alteration is localized along a penetrative fracture system within the ultramafic body and extends up to tens of metres into intact wallrock. Petrography and geochemistry indicate carbonate-alteration proceeded via a three-stage reaction sequence. Serpentinite was converted to magnesite + serpentine which was then converted to magnesite + talc and finally to magnesite + quartz. The overall mineral transformation is the same as proposed industrial carbonation reactions and was accomplished without the alteration of non-volatile chemical species. Geochronology and stable isotopes have helped define the source of carbon dioxide and the constrained the timing and duration of the alteration. Volume changes associated with alteration may play a role in the generation of permeability in advance of carbonation reaction fronts. ln addition, we have modeled magnetic susceptibility as a proxy for listwanite-alteration that has aided in the mapping out of the permeability structure of these systems.