File:Migmatite (Morton Gneiss Complex, Archean, ~3.524 Ga; Cold Spring Granite Company quarry, Morton, Minnesota, USA) 3 (41897958622).jpg
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Summary
| Description |
Migmatite from the Precambrian of Minnesota, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA) Migmatites are very high grade metamorphic rocks that form by partial melting of gneisses. The felsic minerals have melted, cooled, and recrystallized - they form the light-colored, crystalline-textured bands in the rock. The mafic minerals have higher melting temperatures and still retain their metamorphic foliated character. Geologic unit & age: Morton Gneiss Complex, Archean, ~3.524 Ga Locality: Cold Spring Granite Company quarry, near the town of Morton, southern Minnesota, USA |
| Date | |
| Source | Migmatite (Morton Gneiss Complex, Archean, ~3.524 Ga; Cold Spring Granite Company quarry, Morton, Minnesota, USA) 3 |
| Author | James St. John |
Licensing
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/41897958622 (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. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:17, 5 December 2019 | | 3,526 × 2,744 (5.46 MB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
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