File:Multiple generations of dikes (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.719 Ga; just southwest of the Potter Mine, east of Timmins, Ontario, Canada) 1 (47834637192).jpg
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Summary
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Multiple generations of dikes in the Precambrian of Ontario, Canada. These rocks are part of the Late Archean-aged Kidd-Munro Assemblage, which consists of ultramafic and mafic volcanic rocks intruded by mafic to ultramafic dikes and sill-like bodies. Minor felsic volcanic rocks are also present. Volcanogenic massive sulfide deposits occur in the Kidd-Munro Assemblage - they have been mined at the Texas Gulf Mine and the Potter Mine. This outcrop consists of multiple generations of igneous dikes in a matrix of relatively fine-grained volcaniclastic material (= hyaloclastite/basaltic lapillistone) (= upper left & upper right parts of the photo). The dikes intruded wet sediments and brecciated itself, forming peperite (see elsewhere in this photo album). Description from Houlé et al. (2010) (the dikes are referred to as sills): [B]asaltic and komatiitic sills [that] are emplaced into the volcaniclastic succession are interpreted by Gibson and Gamble (2000) as high-level synvolcanic intrusions. Evidence for this interpretation includes: 1) their fractured and autobrecciated upper and lower contacts with massive volcaniclastic material, massive sulfide and/or argillite injected along fractures that penetrated the massive sill interior; 2) locally chilled and sharp upper and lower contacts; 3) the development of hyaloclastite along chilled and perlitic-textured sill contacts and the mixing of this hyaloclastite with enclosing argillaceous mudstones and sulfide to form peperite; and 4) a basaltic composition that is identical to the volcaniclastic rocks. Stratigraphy: Middle Tholeiitic Unit, Kidd-Munro Assemblage, Abitibi Greenstone Belt, lower Neoarchean, 2.711-2.719 Ga Locality: outcrop next to a little dirt road that is just southwest of the Potter Mine, north of Route 101, east-northeast of Matheson & south of the western end of Lake Abitibi & ~83 kilometers east of the city of Timmins, Munro Township, southern Cochrane District, eastern Ontario, southeastern Canada (vicinity of 48° 35' 53.18" North latitude, 80° 12' 46.05" West longitude) (= stop 2.2D2 of Houlé et al., 2010 - Stratigraphy and physical volcanology of komatiites and associated Ni-Cu-(PGE) mineralization in the western Abitibi Greenstone Belt, Timmins area, Ontario: a field trip for the 11th International Platinum Symposium. Ontario Geological Survey Open File Report 6255, p. 34 (figure 16) & p. 39.) |
| Date | |
| Source | Multiple generations of dikes (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.719 Ga; just southwest of the Potter Mine, 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@N05/47834637192 (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 | 06:09, 5 December 2019 | | 4,000 × 3,000 (11.64 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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