File:Jaspilite banded iron formation (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Glen Mine, Chisholm, Minnesota, USA) (22928324493).jpg
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Jaspilite from the Precambrian of the Mesabi Iron Range in Minnesota, USA. (public display, Minnesota Discovery Center, Chisholm, Minnesota, USA) Banded iron formations, or BIFs, are unusual, dense, marine sedimentary rocks consisting of alternating layers of iron-rich oxides and iron-rich silicates. Most BIFs are Proterozoic in age, although some are Late Archean. They do not form in today's oceans - they're an example of an “extinct” rock type. Many specific varieties of iron formation are known. The most attractive type is jaspilite, which is a reddish & silvery gray banded rock consisting of hematite, red chert (“jasper”), and specular hematite or magnetite. Most BIFs have been subjected to one or more orogenic (mountain-building) events, resulting in folding and/or metamorphism. BIFs are known from around the world, but some of the most famous & extensive deposits are found in the vicinity of North America’s Lake Superior Basin. Many BIFs have economic concentrations of iron and are mined as iron ores. Stratigraphy: Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga Locality: Glen Mine, southern side of the town of Chisholm, Mesabi Iron Range, western St. Louis County, northeastern Minnesota, USA (47° 28' 30.31" North latitude, 92° 53' 42.80" West longitude) |
| Date | |
| Source | Jaspilite banded iron formation (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Glen Mine, Chisholm, Minnesota, USA) |
| 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@N05/22928324493 (archive). It was reviewed on 10 October 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 | 00:37, 10 October 2019 | | 2,853 × 2,499 (3.38 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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