File:Gneiss xenolith in anorthosite (Marcy Anorthosite, Mesoproterozoic, 1.16 Ga; Route 18 roadcut west of Saranac Lake, New York State, USA) 1.jpg
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English: Gneiss xenolith in anorthosite in the Precambrian of New York State, USA.
The gray rocks in the photo are anorthosite, a coarsely-crystalline, intrusive igneous rock dominated by plagioclase feldspar. A major occurrence of this uncommon rock is in the Adirondack Mountains of New York State. In this area, the rocks have been regionally metamorphosed, but the overall mineralogy is the same. The elongated, dark-colored, banded mass at center is a garnetiferous gneiss xenolith. Xenoliths ("foreign rocks") are pieces of rock that have fallen from the walls or roof of a cooling magma chamber, or have become entrained in rising masses of magma. Xenoliths can occur in intrusive igneous rocks or extrusive igneous rocks (= volcanic lava). Geologic unit: Marcy Anorthosite, late Mesoproterozoic, 1.16 Ga Locality: Saranac Lake West Outcrop - small roadcut on the northern side of Route 18, northwest to north of Lily Pad Pond, west of the town of Saranac Lake, southern Franklin County, central Adirondack Mountains, northeastern New York State, USA See info. at: en.wikipedia.org/wiki/Anorthosite |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/49905614677/ |
| 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@N05/49905614677. It was reviewed on 9 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 05:59, 9 October 2020 | | 4,000 × 3,000 (11.41 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49905614677/ with UploadWizard |
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