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Title3D reconstruction of base metal zoning in the Flin Flon - Callinan-777 volcanogenic massive sulfide deposits, Manitoba
AuthorByron, J; Schetselaar, E; Gibson, H; Pehrsson, S; Lafrance, B; Devine, C; Ames, D
SourceGeological Survey of Canada, Open File 7508, 2014, 1 sheet,
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is related to the following publications
File formatpdf
NTS63K/12; 63K/13
AreaFlin Flon; Phantom Lake
Lat/Long WENS-102.0000 -101.5000 55.0000 54.5000
Subjectseconomic geology; structural geology; tectonics; stratigraphy; bedrock geology; volcanogenic deposits; sulphides; igneous rocks; volcanic rocks; structural analyses; structural interpretations; mafic volcanic rocks; base metals; base metal deposits; tectonic interpretations; Flin Flon Deposit; Callinan Deposit; 777 Deposit; Trans Hudson Orogen; Flin Flon Formation; Club Member; Blue Lagoon Member; Millrock Member; Hidden Formation; 1920 Member; Reservoir Member; Stockwell Member; Carlisle Lake Member; Louis Formation; Tower Member; Icehouse Member; Precambrian; Proterozoic
Illustrationslocation maps; cross-sections; stratigraphic sections
Natural Resources Canada Library - Ottawa (Earth Sciences)
ProgramTGI-4 Program Coordination, Targeted Geoscience Initiative (TGI-4)
ProgramMethodological Development, Targeted Geoscience Initiative (TGI-4)
Released2014 05 12
AbstractThis document reports the spatial distribution of Cu- versus Zn-rich lenses in the Flin Flon, Callinan and 777 volcanogenic massive sulphide deposits of the Paleoproterozoic Flin Flon Belt, Manitoba. Their relative distribution can be used to locate hydrothermal vent sites in VMS deposits that contain multiple sulphide lenses or deposits. Using historical and modern assay datasets, a 3D Gocad model characterizing the spatial relationships between Cu and Zn concentrations was constructed. The model shows that the Cu-rich zones decrease in size from the base to the top of the Flin Flon and 777 deposits, which is consistent with upward and outward zone-refining of the sulphide lenses. The Cu-rich zones are typically elongate parallel to the topology of the sulphide lenses, which are shaped as flattened ellipsoids that plunge parallel to a pronounced regional stretching lineation. A second, less distinct trend is oriented oblique to the stretching lineation, in both the Flin Flon and 777 deposits. The Flin Flon and 777 deposits have at least three and two distinct Cu-rich zones, respectively, suggesting the presence of separate hight-T hydrothermal vents. The Callinan deposit does not contain a Cu-rich zone, but is slightly more Cu-rich towards its south end. The deposit shows an overall decrease in Cu/Zn ratios from south to north as well as a localized decrease northerly around the interpreted vent. The Callinan ore lenses are interpreted as a clastic sulphide deposit fringing the Zn-rich shell of the 777 deposit possibly derived by mass wasting of sulphide mounds and mass flow transport of sulphide clasts during periods of tectonic instability. A lateral Zn variation is also present and suggests input of additional metals from one or more separate vents located north of the Callinan deposit.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. The manuscript illustrates the variation in three dimensional space of metals in ore bodies of the Flin Flon mining camp. Important preliminary conclusions include 1) that the original orebodies have been faulted as they don't preserve typical intact metal zonation, 2) three main volcanic-related vent sites (black smokers) originally formed and coalesced to create the large Flin Flon main deposit; and 3) The two largest deposits in the camp formed from separate systems that discharged metals at about the same time.