File:Migmatite (Idaho Springs Formation, Paleoproterozoic, ~1.7 Ga; Red Rocks Park, west of Denver, Colorado, USA) 8.jpg
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| Description |
English: Migmatite in the Precambrian of Colorado, 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. The outcrop seen here is an Paleoproterozoic-aged migmatite at the Rocky Mountain Front in Colorado. This is part of the local Precambrian basement. Upper Paleozoic redbeds are nonconformably overlying the basement in the area. Stratigraphy: "Idaho Springs Formation", late Paleoproterozoic, ~1.7 Ga Locality: Red Rocks Park, west of Denver, north-central Colorado, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/52552091724/ |
| 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@N05/52552091724. It was reviewed on 9 December 2022 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 | 16:33, 9 December 2022 | | 3,008 × 2,000 (4.54 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52552091724/ with UploadWizard |
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