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Titre3D geologic modeling in the Flin Flon Mining District, Trans-Hudson Orogen, Canada: evidence for polyphase imbrication of the Flin Flon - 777- Callinan olcanogenic massive sulfide ore system
AuteurSchetselaar, E; Pehrsson, S; Lafrance, B; Devine, C; White, D; Malinowski, M
SourcePaleoproterozoic tectonics and ore deposits of the western Trans-Hudson orogen; Economic geology and the bulletin of the Society of Economic Geologists vol. 111, 2016 p. 877-901,
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100462
ÉditeurSociety of Economic Geologists
Documentpublication en série
Mediapapier; en ligne; numérique
ProvinceManitoba; Saskatchewan
SNRC63F; 63K
Lat/Long OENS-101.9167 -101.8167 54.8000 54.7000
Sujetsétablissement de modèles; Orogène de Trans-hudson ; géologie structurale
Illustrationslocation maps; 3-D models; diagrams; tables; stereograms; photographs
ProgrammeÉtude des gîtes de sulfures massifs volcaniques, Initiative géoscientifique ciblée (IGC-4)
ProgrammeDeveloppements methodologie, Initiative géoscientifique ciblée (IGC-4)
Résumé(disponible en anglais seulement)
Three-dimensional geologic modeling by integrated analysis and interpretation of drill core, 2-D and 3-D seismic, mine survey, and geologic map data provides new insights into the structural setting of the 85.5 million tonne (Mt) Flin Flon-Callinan-777 volcanogenic massive sulfide (VMS) ore system hosted in the Paleoproterozoic Flin Flon belt of Manitoba and Saskatchewan, Canada. The resultant camp-scale 3-D geologic model was, in addition to the densely drill intersected VMS-hosting mine horizon, constrained by lithostratigraphic reference drill holes intersecting the footwall and hanging-wall rock successions of the ore system, which were established by relogging 52 drill holes and systematically reconciling the lithofacies classes in their log descriptions with the lithofacies units of the 1:10,000-scale Flin Flon mining district geologic map. The lateral persistence and large stratigraphic range of these drill hole markers supported seismic interpretation and allowed tracing lithostratigraphic horizons and structures in areas with low drill hole density, expanding 3-D subsurface insight from the local to the more regional structural setting of the ore system.
The overall 3-D modeled geometry and topological relationships between lithostratigraphic surfaces and multiple generations of thrust faults suggest that the Flin Flon mining district is underlain by an E-dipping stack of W-vergent thrust imbricates that formed during precollisional and collisional stages of the 1.9 to 1.8 Ga Trans-Hudson orogeny. The imbricate stack was subsequently deformed by E-trending ductile thrust faults that internally imbricated the Flin Flon arc assemblage and the molasse cover rocks of the Missi Group and brought up rocks of the former over the latter in a northerly direction. The VMS-hosting Millrock Member has been stacked on at least four structural levels, enhancing the VMS potential in the footwall and hanging wall of the known ore deposits where both thrust systems intersect.