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TitleLaser ablation-inductively coupled plasma-mass spectrometric analysis of fluid inclusions from the Windy Craggy Cu-Co-Au volcanogenic massive sulphide deposit: method development and preliminary results
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorSchmidt, M A; Peter, J MORCID logo; Jackson, S EORCID logo; Yang, Z; Leybourne, M I; Layton-Mathews, D
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 243-252, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2017 report of activities, volume 1
File formatpdf
Subjectseconomic geology; geochemistry; mineral deposits; mineral exploration; mineral potential; copper; cobalt; gold; volcanogenic deposits; sulphide deposits; ore mineral genesis; mineralization; ore controls; analytical methods; mass spectrometer analysis; fluid inclusions; magmatism; salinity; thermal history; temperature; trace element analyses; petrographic analyses; Windy Craggy Deposit; Insular Belt; Alexander Terrane; Methodology; Data processing; Phanerozoic; Paleozoic; Precambrian
Illustrationstables; photomicrographs; histograms; plots
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Volcanic and sedimentary systems
Released2018 01 19
AbstractThere is increasing recognition that there is a variable magmatic component to mineralizing fluids in volcanogenic massive sulphide (VMS) deposit formation. A previous fluid inclusion study conducted on the Windy Craggy Cu-Co-Au deposit in northwestern British Columbia documented primary inclusion fluids salinities that are higher than typical VMS fluids. The previous study concluded that the high salinity indicates a magmatic contribution to the ore-forming system. This makes Windy Craggy an ideal study location to test if there is in fact a magmatic influence on the fluids and to quantify that contribution. Preliminary results of this study show fluids consistent in salinity and temperature with those observed in the previous study. Fluids with salinities between 6.2 and 12.2 weight % NaCl equivalent are documented. Laser ablation ICP-MS analysis of these inclusions detects Na, K, Ca, Cu, Sr, Sn, Sb, Ba and Pb as well as trace elements of potential magmatic origin, including Au, W, Sn, In and Bi. Due to the multiple possible sources of Sn, we will be focusing on other potential magmatic elements such as Au, Bi and In as the study progresses. The small number of samples analyzed to date precludes us from making definitive conclusions. However, the detection of some potential magmatic elements in 17 inclusions is promising.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada¿s major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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