File:Lamprophyre dike & hornfels (Archean; Route 17 roadcut southeast of Princess Lake & north of Wawa, Ontario, Canada) 2 (48279135617).jpg

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The gray material at left is a dike composed of a rare igneous rock called lamprophyre. Such rocks are ultrapotassic, mafic to ultramafic, intrusive igneous rocks. This one is a gray hornblende lamprophyre with altered mantle xenoliths.

The material at right is hornfels, a fine-grained contact metamorphic rock formed by heating of country rock by magma. Hornfels vary in mineral composition, depending on the nature of the original country rocks.

Geologic unit and age: Dubreuilville Dike, Archean

Locality: Route 17 roadcut, south of the Route 519-Route 17 intersection, southeast of Princess Lake & north of the town of Wawa, Ontario, southeastern Canada (48° 15' 12.05" North latitude, 84° 52' 59.72" West longitude)

See info. at: <a href="https://en.wikipedia.org/wiki/Lamprophyre" rel="noreferrer nofollow">en.wikipedia.org/wiki/Lamprophyre</a> and

<a href="https://en.wikipedia.org/wiki/Hornfels" rel="noreferrer nofollow">en.wikipedia.org/wiki/Hornfels</a>
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Source Lamprophyre dike & hornfels (Archean; Route 17 roadcut southeast of Princess Lake & north of Wawa, Ontario, Canada) 2
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@N05/48279135617 (archive). It was reviewed on 5 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

5 December 2019

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Date/TimeThumbnailDimensionsUserComment
current05:57, 5 December 2019Thumbnail for version as of 05:57, 5 December 20194,000 × 3,000 (8.47 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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