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TitleMetallogeny of the Pine Point Mississippi Valley-type zinc-lead district, Southern Northwest Territories
AuthorHannigan, PORCID logo
SourceMineral deposits of Canada: a synthesis of major deposit-types, district metallogeny, the evolution of geological provinces, and exploration methods; by Goodfellow, W D (ed.); Geological Association of Canada, Mineral Deposits Division, Special Publication no. 5, 2007 p. 609-632
Alt SeriesEarth Sciences Sector, Contribution Series 20070208
PublisherGeological Association of Canada, Mineral Deposits Division (St. John's, NL, Canada)
Mediapaper; DVD
RelatedThis publication is contained in Mineral deposits of Canada: a synthesis of major deposit-types, district metallogeny, the evolution of geological provinces, and exploration methods
File formatpdf
ProvinceNorthwest Territories
NTS84O/15; 85B/01; 85B/02
AreaGreat Slave Lake; Pine Point
Lat/Long WENS-115.0000 -114.0000 60.2500 59.8333
Subjectseconomic geology; metallic minerals; stratigraphy; mineral occurrences; mineral deposits; mineralization; metallogeny; base metals; zinc; lead; sulphides; Mississippi Valley deposits; sedimentary rocks; carbonates; carbonate rocks; paleoenvironment; epigenetic deposits; alteration; dolomitization; tectonic setting; paragenesis; Western Canada Sedimentary Basin; Devonian; Paleozoic
Illustrationssketch maps; photographs; graphs
ProgramConsolidating Canada's Geoscience Knowledge
ProgramTargeted Geoscience Initiative (TGI-3), 2005-2010
AbstractThe Pine Point Mississippi Valley-type lead-zinc deposit constitutes one of Canada's principal base-metal mining districts with initial geological resources representing near 9% of the Pb and 6% of the Zn endowment in Canada. The deposit is located on the eastern flank of the Western Canada Sedimentary Basin in southern Northwest Territories near the southern shore of Great Slave Lake. It occurs in a mid-Devonian carbonate barrier complex called the Presqu'ile barrier.

Subtle tectonic adjustments along three northeast-trending hinge lines contributed to the evolution of numerous paleo-environmental facies within and adjacent to the barrier complex. The hinge lines are approximate projections of the underlying Precambrian McDonald-Great Slave Lake fault system. They also are lines of weakness in the bedrock where preferential karstification, coarse-crystalline dolomitization (replacement and cement), and sulphide mineralization are concentrated.

At Pine Point, all Mississippi Valley-type deposits are hosted in middle Devonian carbonate strata within or adjacent to a dolomitized barrier complex. The mineralization is pervasive in interconnected paleokarst networks that are directly related to distinct lithofacies. The ore deposits are strongly controlled by individual stratal horizons, although some orebodies are discordant.

Epigenetic sulphide mineralization occurs as open-space cavity fills and local replacement of internal sediments in carbonate strata. The main ore mineralization stage at Pine Point encompassed a complex overlap and repetition of diagenetic phases or processes including deposition of sulphides, hydrothermal dissolution, fracturing and collapse of host rocks, internal clastic sedimentation, saddle dolomite cementation, and thermal alteration of host rock and associated bitumen.

Mineral potential in the Pine Point district was evaluated by applying critical genetic attributes controlling the location of Mississippi Valley-type deposits to empirical evidence of sphalerite and/or galena occurrences.

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