File:Reddish, strongly altered, augite-quartz monzodiorite & black dike of high-FeTi diabase (Duluth Complex, Mesoproterozoic, 1099 Ma; Twin Lakes East Skyline Parkway roadcut, Duluth, Minnesota, USA) 5.jpg
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| Description |
English: Diabase dike intruding quartz monzodiorite in the Precambrian of Minnesota, USA.
These rocks are part of the widespread Duluth Complex, a ~1.1 billion year old suite of igneous rocks in northeastern Minnesota that is associated with volcanism in the Lake Superior segment of the ancient Mid-Continent Rift System. The reddish-colored rock is a strongly altered, augite-quartz monzodiorite. The brown-weathering rock is part of a mafic igneous dike that has intruded the quartz monzodiorite. Dikes are planar igneous intrusions that cut across country rocks. As such, they postdate the host rocks. This igneous dike is composed of high-iron, high-titanium diabase (microgabbro). Geologic unit & age: Duluth Complex, late Mesoproterozoic, 1099 Ma Locality: Twin Lakes East outcrop (Twin Ponds East outcrop) - roadcut along the northern side of Skyline Parkway, Duluth, northeastern Minnesota, USA (46° 46’ 43.77” North, 92° 07’ 16.40” West) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/22093539138/ |
| 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@N05/22093539138. It was reviewed on 19 June 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 | 08:48, 19 June 2022 | | 4,000 × 2,347 (4.5 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/22093539138/ with UploadWizard |
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