Regional metallogeny of the northern Cordillera: tungsten and base metal-bearing skarns in southeastern Yukon and southwestern Mackenzie

Dawson, K M; Dick, L. A.

doi:10.4095/103903

Cited by 7 publications

(6 citation statements)

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“…Aitken (1960), Gabrielse (1969), Mulligan (1963), and Poole et al (1960). ++++++++,+++ ++++ ++++ A final point is that Logtung is on the side of the Tintina strike-slip fault opposite the better known tungsten deposits such as Cantung, Mactung, Clea, and Lened (e.g., Dawson and Dick, 1978). Approximately 450 km of dextral movement occurred on the Tintina fault in Late Cretaceous and/or early Tertiary time, i.e., after formation of the tungsten deposits (Roddick, 1967;Tempelman-Kluit, 1980).…”

Section: Regional Geologic Relationshipsmentioning

confidence: 99%

The Logtung large tonnage, low-grade W (scheelite)-Mo porphyry deposit, south-central Yukon Territory

Noble¹,

Spooner²,

Harris³

1984

Economic Geology

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The Logtung deposit, discovered in 1976, is an example of large tonnage (162 million metric tons), low-grade (0.13% WO3 and 0.052% MoS2) W(scheelite)-Mo mineralization related to multiple felsic intrusions. Since mineralization is contained in fractures ()95%) rather than being disseminated Logtung is not a skarn deposit. The principal reason is that the quartz-diopside-garnet calc-silicate, biotite-quartzite, and wollastonite-vesuvianite calcsilicate reaction skarn host rocks to mineralization, which were derived from calcareous shales interbedded with graphitic quartzites, are carbonate poor and competent. Hence, permeable mineralization formed in permeability created by hydraulic fracturing, and not by replacement. Logtung shows a scheme of several phases (4) of mineralization related to multiple intrusions (>•2) which is similar to that which is so important in, for example, the evolution of the Climax and Urad-Henderson Mo systems. The earliest quartz-molybdoscheelite vein system, which consists of a typical porphyry-style crackle breccia of thin (•--0.5-4.0 mm), red-brown quartzgarnet-diopside-molybdoscheelite veins, is related to a highSiO2 ('• 76%), seriate-porphyritic monzogranite stock (•--2.0 X 0.5-1.0 km) of Cretaceous age (118 +_ 2 m.y. (2tr); (Stewart, 1983). Later quartz-pyrite-scheelite (fiuorite-K-Na-feldspars-molybdenite) veins, with prominent green, hornblende-bearing alteration selvages, and quartz-molybdenite (-pyritefluorite-scheelite) veins are related to a quartz-feldspar-spessartine-rich garnet porphyritic felsic dike complex •'-500 m across. Both the intrusive phases have anomalously high W and Mo concentrations of •--100 ppm and •'-50 ppm, respectively, which are thought to reflect a primary enrichment (Stewart, 1983). The final stage of mineralization consists of a prominent •'-4.5 X •'-1.0 km zone of polymetallic sheeted veins •--1 cm to •--1 m wide centered on the felsic dike complex. The system is zoned from quartz-scheelite-molybdenite-pyrite-blue-green beryl-fiuorite-bismuthinite veins in the core to Pb-Zn-Ag veins with abundant arsenopyrite and minor Sn (•--0.1%) in the northeast. The focus of recurrent intrusive and hydrothermal activity was located above a flank, or nose, of the monzogranite stock. The final distribution of WO3 and MoS• grades within the '--750 m (across) X '--300 m (evaluation depth) ore zone is a result of the variable superimposition of the four separate vein systems which had different W/Mo ratios. Hence, well-defined W and Mo ore shells, such as those at Climax, Henderson, and Mt. Emmons, did not develop at Logtung. The upper surface of mineralization, as shown by the 0.03 percent MoS• contour, defines an elongate dome with an apical region approximately coincident with the felsic dike complex. Hydrothermal alteration occurs as well-defined vein selvages and not as pervasive zones. The Logtung deposit shows many similarities to porphyry Mo deposits in the western Cordillera and may be classed as a porphyry W(scheelite)-Mo deposit, with a W/Mo ratio of 3.3:...

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Section: Regional Geologic Relationshipsmentioning

confidence: 99%

The Logtung large tonnage, low-grade W (scheelite)-Mo porphyry deposit, south-central Yukon Territory

Noble¹,

Spooner²,

Harris³

1984

Economic Geology

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“…13; Dawson and Dick 1978;Dick and Hodgson 1982;Dawson 1996;Hart et al 2004a). Two exemplary examples are: 1) The pastproducing Cantung Mine; and 2) Mactung, North America's second largest tungsten deposit; Sisson Brook, New Brunswick, is recognized as Canada's largest tungsten deposit and its development will surpass Cantung as the largest tungsten producer in North America.…”

Section: Intrusion-related Skarn Depositsmentioning

confidence: 99%

Metallogenic Evolution of the Mackenzie and Eastern Selwyn Mountains of Canada’s Northern Cordillera, Northwest Territories: A Compilation and Review

Ootes

Gleeson

Turner

et al. 2013

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The Mackenzie and eastern Selwyn Mountains, Northwest Territories, Canada, are the northeast expression of the Cordilleran orogen and have a geologic history that spans the last one billion years. The region has undergone a diverse tectonic evolution, which is reflected in an equally diverse collection of mineral deposits and prospects. More than 300 of these deposits and prospects have been documented in this area of the Northwest Territories and here they are categorized into mineral deposit types and their mode of formation evaluated and highlighted. Stratiform/stratabound Cu-Ag occurrences are hosted in the Neoproterozoic Coates Lake Group, generally preserved in the hanging wall of the Cretaceous Plateau fault, and define a belt through the central part of the Mackenzie Mountains. Low-grade phosphatic stratiform iron (47.5% Fe) occurs as iron formation in the Neoproterozoic Rapitan Group in the very northwest of the Mackenzie Mountains. Sedimentary exhalative Zn-Pb (± Ba) deposits are preserved in Cambrian through Devonian strata of the Selwyn Basin in the eastern Selwyn Mountains. Numerous carbonate-hosted Zn-Pb (± base-metals) occurrences are located in the Paleozoic strata of the Mackenzie Platform in the Mackenzie Mountains. Cretaceous felsic-intermediate plutons, which occur throughout the eastern Selwyn Mountains, are associated with tungsten skarn (proximal to intrusions), base-metal skarn (distal from intrusions), rare metals, semi-precious tourmaline related to pegmatites, and vein-hosted emeralds. Other resources of potential interest include coal deposits, placer gold, and possible Carlin-type gold deposits that have recently been identified farther west in the Yukon.SOMMAIRELes monts Mackenzie et ceux de la chaîne orientale de Selwyn, dans les Territoires du Nord-Ouest, au Canada, sont l'expression au nord-est de l'orogène de la Cordillère, et leur histoire géologique s’étale sur le dernier milliard d’années. La région a été l’hôte d’une évolution tectonique diversifiée, et cela se reflète par une suite tout aussi diversifiée de gisements minéraux et d’indices prometteurs. Plus de 300 de ces dépôts et indices prometteurs ont été documentées dans cette région des Territoires du Nord-Ouest, et le présent article ils sont classés en types de gîtes minéraux, et l’attention est portée sur leur mode de formation. Les gisements de Cu-Ag stratiformes ou stratoïdes sont encaissés dans le Groupe néoprotérozoïque de Coates Lake, et ils sont généralement préservés dans l'éponte supérieure de la faille du plateau crétacé, et ils forment une bande qui traverse la partie centrale des monts Mackenzie. Le fer se retrouve dans des gisements phosphatées stratiformes à faible teneur (47,5% Fe) qui provient de formations de fer dans le Groupe néoprotérozoïque de Rapitan situé dans la pointe nord-ouest des monts Mackenzie. Des gisements sédimentaires exhalatifs de Zn-Pb (± Ba) sont préservés dans des strates cambriennes à dévoniennes du bassin de Selwyn dans la portion est des monts Selwyn. De nombreux indices de Zn-Pb (± métaux communs) dans des roches carbonatées des strates paléozoïques de la plate-forme de Mackenzie, des monts Mackenzie. Des plutons felsiques intermédiaires crétacés, qui pointent tout au long de la chaîne est de Selwyn, sont associées à des skarns de tungstène (proximaux), à des skarns de métaux communs (distaux), à des concentrations de métaux rares, de tourmaline semi-précieuses liés aux pegmatites, et à des émeraudes filoniennes. Parmi d’autres ressources d'intérêt, on retrouve des gisements de charbon, d'or alluvionnaire, et d’éventuels gisements d'or de type Carlin qui ont été découverts récemment plus à l'ouest au Yukon.

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“…Zinc-bearing skarns have been described in many countries. Including Japan (Shimazaki, 1975), U.S.S.R. (Zharikov, 1970), Korea (Yun, 1979), Norway (Goldschmidt, 1911), Italy (Schaller, 1938), Peru ( Burt, 1972), Mexico (Alien and Fahey, 1957), Canada (Dawson and Dick, 1978), and in the United States (Alien and Fahey, 1957;Burt, 1972;Meinert, 1980). The environment of formation of zinc-bearing skarns is not as well understood as that of other skarn types but the general features are summarized In Table 4.…”

Section: Zinc-bearing Skarnsmentioning

confidence: 99%

“…Some zincbearing skarns are associated with intermediate size granodiorite stocks, whereas others seem to be related to structural pathways, such as major faults, where the existence of a causative pluton can only be inferred. Many zincbearing skarns occur in districts which contain major ore deposits mined for metals other than zinc (Central mining district, Hernon and Jones, 1968; Crescent Lake, Dawson and Dick, 1978;Railroad district, Gillerman, in preparation). Although in many ways zinc-bearing skarns appear to be intermediate between or associated with other skarn types, they are invariably characterized by a distinctive manganese-and Iron-rich calc-silicate mineralogy (see general reviews by Zharikov, 1970;Burt, 1972; which suggests that the metasomatic fluid which forms zinc-bearing skarns differs from that which forms other skarn types.…”

Section: Zinc-bearing Skarnsmentioning

confidence: 99%

Proceedings of the Symposium on Mineral Deposits of the Pacific Northwest: Geological Society of America, Cordilleran Section meeting at Corvallis, Oregon, March 20-21, 1980

Field¹,

Berry²

1981

Open-File Report

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Regional metallogeny of the northern Cordillera: tungsten and base metal-bearing skarns in southeastern Yukon and southwestern Mackenzie

Cited by 7 publications

References 0 publications

The Logtung large tonnage, low-grade W (scheelite)-Mo porphyry deposit, south-central Yukon Territory

The Logtung large tonnage, low-grade W (scheelite)-Mo porphyry deposit, south-central Yukon Territory

Metallogenic Evolution of the Mackenzie and Eastern Selwyn Mountains of Canada’s Northern Cordillera, Northwest Territories: A Compilation and Review

Proceedings of the Symposium on Mineral Deposits of the Pacific Northwest: Geological Society of America, Cordilleran Section meeting at Corvallis, Oregon, March 20-21, 1980

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