The redistribution of copper during low-grade metamorphism of the Karmutsen Volcanics, Vancouver Island, British Columbia

Lincoln, Timothy N.

doi:10.2113/gsecongeo.76.8.2147

Cited by 15 publications

(4 citation statements)

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“…Recent suggestions for the origin of the large native Cu deposits in the approximately 1200-Ma Keweenawan basalts (northern Michigan and adjacent Ontario) include opposing mechanisms: mobilization of Cu during prehnite-pumpellyite grade metamorphism (White, 1968;Jolly, 1974;Livnat et al, 1983) and high-temperature processes associated with a hidden intrusion Spooner, 1985, 1986). Redistribution of Cu at low metamorphic grades seems to be the most popular current model for the concentration of native Cu in ancient tholeiites (e.g., Lincoln, 1981;Sood et al, 1986). This paper is a preliminary report on native Cu mineralization found in foundered, subaerially erupted tholeiites of the early Tertiary volcanic province of the North Atlantic region (Fig.…”

Section: Introductionmentioning

confidence: 87%

Native Copper in ODP Site 642 Theoleiites

LeHuray¹

1989

Proceedings of the Ocean Drilling Program

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Section: Introductionmentioning

confidence: 87%

Native Copper in ODP Site 642 Theoleiites

LeHuray¹

1989

Proceedings of the Ocean Drilling Program

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“…Humphris & Thompson 1978;Condie et al 1977), and metamorphic processes have been attributed to the formation of native copper deposits in metabasalts (e.g. Jolly 1974;Lincoln 1981), and to copper vein deposits in the Old Red Sandstone in Ireland, but within a very different stratigraphic setting (Wen et aL 1999). Epidosite, a rock type consisting of epidote + quartz, may arise during the metasomatic alteration of basalt, and large copper depletions may be found in epidosite and in epidotized greenstones (Kish & Stein 1989).…”

Section: Sa~svatn Cu-mo Mineralization and Metamorphic Evolution Of Smentioning

confidence: 99%

1.05–1.01 Ga Sveconorwegian metamorphism and deformation of the supracrustal sequence at Sæsvatn, South Norway: Re-Os dating of Cu-Mo mineral occurrences

Stein

Bingen

2002

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Re-Os dating of a suite of nine molybdenite samples from two small Cu-Mo mineral occurrences in the epidote-amphibolite facies Sa~svatn supracrustal sequence provides a temporal record of Sveconorwegian metamorphism and deformation. The sequence is situated in the western allochthonous lithotectonic domain of the Sveconorwegian orogen, the Rogaland-Hardangervidda terrane of south Norway. Onset of metamorphism occurred at about 1047 + 2 Ma, as recorded in small gash veinlets, followed by a deforrnational peak at about 1032 + 2 Ma, as recorded in mineralized breccia and mineralized metagabbro comprising a ductile shear zone constituting the Langvatn deposit. Deformation waned significantly by about 1017 i 2 Ma, based on mineralization hosted in a brittle fault zone within stratigraphically higher metabasalts exposed at the Kobbernuten deposit. The origin of the mineralization at both deposits is most probably metamorphic with ore constituents provided by metasomatism of hosting basalt and gabbro. A metamorphic origin is supported by an array of Re-Os ages that can be related to structural features and the stratigraphic sequence, the absence of plutons related in time and space, the confinement of ore occurrences to mafic sequences in a bimodal supracrustal package that includes rhyolites and clastic units, and clear evidence for Cu mobility in mafic units. The 'main' Sveconorwegian orogenic event, probably a continentcontinent collision involving imbrication, stacking, and burial of terranes took place at about 1.05 Ga and thereafter. Peak deformation in the Sa~svatn supracrustal sequence in the western part of the Sveconorwegian orogen (South Norway) may correlate with thermal metamorphism in the Idet]orden terrane in the eastern part of the orogen (SW Sweden), with a timing of about 1.03 Ga for both regions. The results of this study indicate that comparatively low grade domains in the orogen (greenschist to epidote-amphibolite facies), corresponding to upper crust, were deformed in a ductile fashion at about 1.03 Ga and were affected by brittle deformation as early as 1.025-1.015 Ga. In the high-grade domains (amphibolite to granulite facies), corresponding to middle and lower crust, ductile deformation is younger, beginning at about 1.025 Ga and persisting until 0.97 Ga.

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“…These veins are similar in mineralogy and geologic setting to deposits within and stratigraphically above the Nikolai Greenstone and equivalents in southcentral Alaska and western British Columbia (for example, Lincoln, 1981). Regional mapping (Burns and others, 1983) shows that Sheep Mountain is the only outcrop area of basaltic-andesitic tuff of the Talkeetna Formation known in the northcentral Chugach Mountains, which implies that the occurrence of such copper-rich veinlets is not very widespread.…”

Section: Copper-rich Veinsmentioning

confidence: 80%

Mineral resources of the northcentral Chugach Mountains, Alaska

Newberry¹

1986

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According to Alaska Statute 41, the Alaska Division of Geological and Geophysical Surveys is charged witti conducting 'geological and geophysical surveys to determine the potential of Alaskan land for production of metals, minerals, fuels, and geothermal resources; the locations and supplies of ground water and construction materials; the potential geologic hazards to buildings, roads, bridges, and other installations and structures; and shall conduct such other surveys and investigations as will advance knowledge of the geology of Alaska.'In addition, the Division of Geological and Geophysical Surveys shall collect, record, evaluate, and distribute data on the quantity, quality, and location of underground, surface, and coastal water of the state; publish or have published data on the water oE the state and require that the results and findings of surveys of water quality, quantity, and location be filed; require that water-well contractors file basic water and aquifer data, including but not limited to well location, estimated elevation, welldriller's logs, pumping tests, flow measurements, and water-quality determinations; accept and spend funds for the purposes of this section, AS 41.08.017 and 41.08.035, and enter into agreements with individuals, public or private agencies, communities, private industry, and state and federal agencies; collect, record, evaluate, archive, and distribute data on seismic events and engineering geology of the state; and identify and inform public officials and industry about: potential seismic hazards that might affect development in the state. DGGS offices are located at:.794 University Ave. .3601 C St. (8th fl.) (Bas emen t )

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The redistribution of copper during low-grade metamorphism of the Karmutsen Volcanics, Vancouver Island, British Columbia

Cited by 15 publications

References 0 publications

Native Copper in ODP Site 642 Theoleiites

Native Copper in ODP Site 642 Theoleiites

1.05–1.01 Ga Sveconorwegian metamorphism and deformation of the supracrustal sequence at Sæsvatn, South Norway: Re-Os dating of Cu-Mo mineral occurrences

Mineral resources of the northcentral Chugach Mountains, Alaska

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