File:Mafic dike in Cadillac Mt. Granite (~Silurian-Devonian boundary time, ~419 Ma; South Bubble, Mt. Desert Island, Maine, USA) 5.jpg
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English: These rocks are part of the Cadillac Mountain Granite, a large granitic pluton that crystallized about 419 to 424 million years ago, at Silurian-Devonian boundary times [a 365 Ma date has also been published]. The granite body represents the cooled magma chamber beneath a large, ancient volcano.
The band going through the granite is a mafic dike. Igneous dikes are planar intrusions that cut across country rocks. They can be thin or thick and can be oriented vertically or not. Common dike compositions are felsic (granite) and mafic (basalt/diabase). Locality: summit of South Bubble, Acadia National Park, Mt. Desert Island, southern-coastal Maine, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50604066057/ |
| 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@N05/50604066057. It was reviewed on 18 November 2020 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 | |
|---|---|---|---|---|---|
| current | 00:59, 18 November 2020 | | 3,008 × 2,000 (4.98 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50604066057/ with UploadWizard |
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