| Title | Metallogeny of the Pine Point Mississippi Valley-type zinc-lead district, Southern Northwest Territories |
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| Author | Hannigan, P |
| Source | Mineral 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 |
| Image |  |
| Year | 2007 |
| Alt Series | Earth Sciences Sector, Contribution Series 20070208 |
| Publisher | Geological Association of Canada, Mineral Deposits Division (St. John's, NL, Canada) |
| Document | serial |
| Lang. | English |
| Media | paper; DVD |
| Related | This 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 format | pdf |
| Province | Northwest Territories |
| NTS | 84O/15; 85B/01; 85B/02 |
| Area | Great Slave Lake; Pine Point |
| Lat/Long WENS | -115.0000 -114.0000 60.2500 59.8333 |
| Subjects | economic 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 |
| Illustrations | sketch maps; photographs; graphs |
| Program | Consolidating Canada's Geoscience Knowledge |
| Program | Targeted Geoscience Initiative (TGI-3), 2005-2010 |
| Abstract | The 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. |
| GEOSCAN ID | 224197 |
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