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• W71302445 abstract "The Nain Province (NP) of northern Labrador is a >600 km long by ≤100 km wide Archean craton that has undergone relatively little mineral exploration until economically significant concentrations of orthomagmatic nickel sulphide were discovered by Diamond Fields Resources (DFR) at Voisey's Bay. Due to the great time span between crust formation and final intrusive activity (ca. 3.9 Ga to 1.27 Ga), there were, however, numerous metallogenic events within the NP. The NP was intruded by the ca. 1.3 Ga to 1.2 Ga Nain Plutonic Suite (NPS) composite anorthosite-granite complex. The NPS divides the NP into the southern Hopedale Block (90 km by 150 km) and the northern Saglek Block (375 km long by ≤50 km wide). These two blocks appear to represent two distinct Archean cratonic nuclei, each with its own distinct metallogenic history. The NPS is a coalesced assemblage of composite intrusions which include anorthosite, troctolite, norite, gabbro and granite. The Hopedale Block contains the Hunt River and Florence Lake greenstone belts, and the Weekes Amphibolite which represents remnants of the older Hunt River greenstone belt. Geologically, these belts have some potential to host komatiitic Kambalda-style nickel, volcanogenic massive sulphide (VMS) and mesothermal lode gold mineralization. The unconformity between Paleoproterozoic cover sequences and the trondhjemite-tonalite-granodiorite (TTG) suite which engulfed the greenstones was the locus for lead-zinc-bearing quartz-carbonate veins. Minor fracture-hosted uraninite showings are also present in the TTG. The Saglek Block is a high-grade gneiss terrane with deformed Archean supracrustal sequences but no greenstone belts. Within the gneiss are variably-sized enclaves that range in composition from anorthositic to ultramafic; some of these latter xenoliths contain abundant fuchsite. There are also three small anorthositic to ultramafic meta-igneous complexes present in the gneiss near Okak Bay. Some Archean metasedimentary and mafic gneiss supracrustal sequences contain iron-oxide and sulphide members. The sulphide-bearing Tasiuyak paragneiss defines the cratonic suture between the NP and Churchill (Rae) Province. Along the cratonic suture between the NP and Churchill Province from Ramah Bay north are remnants of the Archean (or Paleoproterozoic) Hutton Anorthosite Suite. Ultramafic layers within the suite contain chromite and elevated Ni values. Three ca. 2.0 Ga supracrustal sequences were deposited in small fault-bounded basins within the NP. The Snyder Group contains pyrrhotitiferous massive sulphide horizons. The Mugford Group contains SEDEX-like massive sulphide blocks in a debris flow and ultramafic sills with unusual PGE concentrations; alaskitic granite cutting basement gneiss to the group contains stockwork-like pyritiferous quartz veins. The Ramah Group contains numerous MVT-style zinc-lead sulphide occurrences. The Reid Brook Intrusion of the NPS contains enormous and high-grade nickel-copper-cobalt massive sulphide bodies at the Voisey's Bay deposit. Exploration in the northern portions of the NPS in 1995 has indicated the presence of other potentially economic nickel sulphide horizons." @default.
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• W71302445 date "1996-01-01" @default.
• W71302445 modified "2023-09-26" @default.
• W71302445 title "Metallogenic overview of the Nain Province, northern Labrador" @default.
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