File:Quartz-mineralized fault zone in slate (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Thunderbird Mine, Mesabi Iron Range, Minnesota, USA) 1 (30824329723).jpg
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[edit]DescriptionQuartz-mineralized fault zone in slate (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Thunderbird Mine, Mesabi Iron Range, Minnesota, USA) 1 (30824329723).jpg |
Fault zone in slate from the Precambrian of Minnesota, USA. This rock is from a Minnesota iron mine that is targeting banded iron formations, or BIFs, which 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. The whitish-gray & dull grayish-brown areas are a fault zone hosted in slate. The whitish-gray material is quartz. The dark lineations at top are "slickensides", which were formed by fault movement. Stratigraphy: lower slaty member, Biwabik Iron-Formation, middle Animikie Group, upper Paleoproterozoic, ~1.878 Ga Locality: Thunderbird Mine/Auburn Mine - open-pit mine complex on the western side of Rt. 53, south of the town of Virginia & north of the town of Eveleth, Mesabi Iron Range, central St. Louis County, northeastern Minnesota, USA |
Date | |
Source | Quartz-mineralized fault zone in slate (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Thunderbird Mine, Mesabi Iron Range, Minnesota, USA) 1 |
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@N05/30824329723 (archive). It was reviewed on 22 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
22 October 2019
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Date and time of data generation | 19:30, 10 December 2016 |
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Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 00:05, 14 December 2016 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 19:30, 10 December 2016 |
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Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 19:05, 13 December 2016 |
Unique ID of original document | 1E49B07F3BE9D26FDBEE612346ECF008 |