File:Tholeiitic basalt dike & peperite & basaltic lapillistone (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.719 Ga; just east of the Potter Mine, east of Timmins, Ontario, Canada) 2 (47872088771).jpg
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Tholeiitic basalt dike & peperite 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) and numerous breccia clasts. 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. 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 due-east 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' 54.89" North latitude, 80° 12' 31.33" West longitude) (= locality 2d east of the Potter Mine in Fyon & Green, 1991 - Geology and ore deposits of the Timmins District, Ontario (field trip 6), Geological Survey of Canada Open File 2161, p. 27 (fig. N12).) (= stop 2.2D1 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 | Tholeiitic basalt dike & peperite & basaltic lapillistone (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.719 Ga; just east 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@N05/47872088771. 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 | 06:06, 5 December 2019 | | 4,000 × 3,000 (11.6 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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