File:Jaspilite banded iron formation (BIF) (Vulcan Iron-Formation, Paleoproterozoic, ~1.8 Ga; Iron Mountain, Menominee Iron Range, Upper Peninsula of Michigan, USA) (15059116882).jpg
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[edit]DescriptionJaspilite banded iron formation (BIF) (Vulcan Iron-Formation, Paleoproterozoic, ~1.8 Ga; Iron Mountain, Menominee Iron Range, Upper Peninsula of Michigan, USA) (15059116882).jpg |
Jaspilite from the Precambrian of Michigan, USA. (CMNH 12715, Cleveland Museum of Natural History, Cleveland, Ohio, USA) Banded iron formations, or BIFs, are unusual, dense 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), and do not form today - they're “extinct”! Many specific varieties of iron formation are known, and some are given special rock names. For example, jaspilite is an attractive reddish & silvery gray banded rock consisting of hematite, red chert (“jasper”), and specular hematite or magnetite. Because of their age, most BIFs have been around long enough to have been subjected to one or more orogenic (mountain-building) events. As such, most BIFs are folded and/or metamorphosed to varying degrees. BIFs are known from around the world, but some of the most famous & extensive BIF deposits are found in the vicinity of North America’s Lake Superior Basin. Many BIFs have economic concentrations of iron and are mined. BIFs are the most important variety of iron ore on Earth. Stratigraphy: banded magnetite-jasper facies, Vulcan Iron-Formation, Paleoproterozoic, ~2.1 Ga (or ~1.87 Ga?) Locality: vicinity of the town of Vulcan or West Vulcan or Iron Mountain, Menominee Iron Range, Upper Peninsula of Michigan, USA |
Date | |
Source | Jaspilite banded iron formation (BIF) (Vulcan Iron-Formation, Paleoproterozoic, ~1.8 Ga; Iron Mountain, Menominee Iron Range, Upper Peninsula of Michigan, 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@N05/15059116882 (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. |
10 October 2019
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ISO speed rating | 104 |
Date and time of data generation | 03:36, 17 January 2011 |
Lens focal length | 9.8170011806375 mm |
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Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
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File change date and time | 23:50, 27 August 2014 |
Exif version | 2.2 |
Date and time of digitizing | 03:36, 17 January 2011 |
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Maximum land aperture | 3.625 APEX (f/3.51) |
Metering mode | Pattern |
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Image width | 2,592 px |
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Date metadata was last modified | 19:50, 27 August 2014 |