File:Auriferous banded quartz-fuchsite hydrothermal vein rock (Abitibi Greenstone Belt, Neoarchean; Placer Dome Mine (Dome Mine), Porcupine Mining District, east of Timmins, Ontario, Canada) 1 (15178961728).jpg
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[edit],_Porcupine_Mining_District,_east_of_Timmins,_Ontario,_Canada)_1_(15178961728).jpg&action=edit§ion=1){kind=link}
| Description |
Auriferous banded quartz-fuchsite hydrothermal vein rock (gold ore) from the Precambrian of Ontario, Canada. (6.3 centimeters across its widest) The bedrock in the Timmins, Ontario area is richly gold-mineralized. Numerous mines exploit gold ores of various lithologies. This is auriferous banded quartz-fuchsite hydrothermal vein rock - also referred to as strained ribbon quartz. The "ribbons" are greenish-colored and principally composed of fuchsite and chlorite, plus native gold (Au). Published research has shown that gold was emplaced during minor drops in pressure during many crack-and-seal events (incremental dilation) that formed the ribbon quartz vein. Crack-and-seal events were initiated by hydraulic fracturing accompanying fluid discharge. Geologic context & age: quartz-fuchsite-chlorite-gold hydrothermal vein hosted in carbonatized komatiite, southern flanks of the Porcupine Syncline, Abitibi Greenstone Belt, Neoarchean; gold-quartz-fuchsite mineralization at 2633 to 2670 Ma Locality: Dome Mine (Placer Dome Mine), Porcupine Mining District, east of the city of Timmins, Ontario, southeastern Canada (48° 27’ 44.55” North, 81° 14’ 27.89” West) Most info. synthesized from: Fryer, B.J., R. Kerrich, R.W. Hutchinson, M.G. Peirce & D.S. Rogers. 1979. Archean precious-metal hydrothermal systems, Dome Mine, Abitibi Greenstone Belt I, patterns of alteration and metal distribution. Canadian Journal of Earth Sciences 16: 421-439. Moritz, R.P. & J.H. Crocket. 1990. Mechanics of formation of the gold-bearing quartz-fuchsite vein at the Dome Mine, Timmins area, Ontario. Canadian Journal of Earth Sciences 27: 1609-1620. York, D., P.W. Layer, N.D. McMaster, C.M. Hall & A. Masliwec. 1991. The dating of Ontario's gold deposits. Ontario Geological Survey Open File Report 5738. 161 pp. |
| Date | |
| Source | Auriferous banded quartz-fuchsite hydrothermal vein rock (Abitibi Greenstone Belt, Neoarchean; Placer Dome Mine (Dome Mine), Porcupine Mining District, east of Timmins, Ontario, Canada) 1 |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15178961728 (archive). It was reviewed on 5 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 05:44, 5 December 2019 | | 5,834 × 3,948 (3.67 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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