File:Paleo-seafloor black smoker rocks in siderite iron-formation (Helen Iron-Formation, Neoarchean, 2696-2749 Ma; Sir James Pit, Eleanor Iron Range, Ontario, Canada) 2 (48069841516).jpg
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| Description |
Black smoker rocks & iron-formation in the Archean of Ontario, Canada. This is the Sir James Mine, also known as the Sir James Pit. It is an inactive iron mine near Wawa, Ontario, Canada. The black structure in the high wall is an ancient black smoker structure. Black smokers are seafloor hydrothermal vents at mid-ocean ridges. Hot water rich in dissolved minerals is spewed from the seafloor. They appear as if black smoke is emerging from the seabed, but it's not smoke. The surrounding cold water causes dissolved minerals in the hydrothermal fluids to precipitate. This process builds chimney-like structures. (See: <a href="http://1.bp.blogspot.com/_4vn24YA-Rc4/SR18Ctg32DI/AAAAAAAAAV4/SyK9OBjMLqI/s400/A+black+smoker.jpg" rel="noreferrer nofollow">1.bp.blogspot.com/_4vn24YA-Rc4/SR18Ctg32DI/AAAAAAAAAV4/Sy...</a>) Samples of black smoker rocks are scattered about at the mine site. They are black-colored, moderately friable, and partly coated with whitish powder (probably melanterite - hydrous iron sulfate). The rocks are appear to be pyritic wad (= manganese oxide rock). The reddish and brownish rocks around the black smoker structure in the photo consist of iron-formation, interbedded with quartzite. The iron-formation includes siderite-rich and hematite-rich varieties. Stratigraphy: Helen Iron-Formation, Michipicoten Group, Neoarchean, 2.696 to 2.749 Ga Locality: Sir James Pit (Sir James Mine) - abandoned iron mine between Lena Lake (to the north) and the eastern end of Wawa Lake (to the south), north of Route 101, northeast of the town of Wawa, Eleanor Iron Range portion of the Michipicoten Iron Range, Michipicoten Greenstone Belt, Ontario, southeastern Canada (48° 02.376’ North latitude, 84° 40.876’ West longitude) |
| Date | |
| Source | Paleo-seafloor black smoker rocks in siderite iron-formation (Helen Iron-Formation, Neoarchean, 2696-2749 Ma; Sir James Pit, Eleanor Iron Range, 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@N05/48069841516 (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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 06:14, 5 December 2019 | | 4,288 × 2,610 (9.85 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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