File:Dike & peperite & basaltic lapillistone (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.719 Ga; just southwest of the Potter Mine, east of Timmins, Ontario, Canada) 2 (40920205053).jpg
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[edit]DescriptionDike & peperite & basaltic lapillistone (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.719 Ga; just southwest of the Potter Mine, east of Timmins, Ontario, Canada) 2 (40920205053).jpg |
Dike & peperite & basaltic lapillistone in the Precambrian of Ontario, Canada. These unusual-looking 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 an igneous dike (= gray mass at upper left), breccia clasts, and relatively fine-grained volcaniclastic material (= hyaloclastite/basaltic lapillistone) (= bottom half of photo). The dike intruded wet sediments and brecciated itself, forming peperite. According to the British Geological Survey, peprite is a "lithified, fluidized mix of hyaloclastite and sediments formed by the disruption & rapid chilling of magma when intruded into, or flows over, wet sediments." (see Gillespie & Styles, 1999). It's very rare to get well-preserved peperite in the Archean. 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.) Additional reference cited: Gillespie & Styles (1999) - BGS rock classification scheme, volume 1, classification of igneous rocks. British Geological Survey Research Report 99-06. 52 pp. |
Date | |
Source | Dike & peperite & basaltic lapillistone (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.719 Ga; just southwest of the Potter Mine, east of Timmins, Ontario, Canada) 2 |
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@N05/40920205053 (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. |
5 December 2019
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File change date and time | 22:20, 19 May 2019 |
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Date and time of digitizing | 09:33, 14 July 2012 |
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Date metadata was last modified | 18:20, 19 May 2019 |
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