File:Gabbro & diorite & granite dikes (Devonian; Hulls Cove, Mt. Desert Island, Maine, USA) 2.jpg
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| Description |
English: The blackish-colored rock is gabbro, a mafic, phaneritic, intrusive igneous rock composed of plagioclase feldspar and pyroxene. The grayish speckled rock is diorite, which is similar to gabbro, except diorite has an intermediate chemistry. Garden-variety diorites are composed of plagioclase feldspar and mafic minerals (amphibole/pyroxene/biotite mica). The light-colored "veins" are granite dikes. Granite is the felsic equivalent of gabbro and diorite. Granites have quartz and potassium feldspar, often with sodic plagioclase feldspar, amphibole, and mica.
This site is unusual in having three igneous chemistries in one outcrop. Geologic unit: gabbro-diorite unit, Cadillac Mountain Intrusive Complex, Early Devonian, 418 Ma Locality: coastal exposure at Hulls Cove, eastern side of Route 3, northeastern Mt. Desert Island, coastal Maine, USA (44° 24.940’ North latitude, 68° 15.047’ West longitude) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50592898146/ |
| 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@N05/50592898146. 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 | |
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| current | 00:59, 18 November 2020 | | 3,008 × 2,000 (4.25 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50592898146/ with UploadWizard |
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