File:Nara Brown Granite (charnockite) Quebec.jpg
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| Description |
Nara Brown Granite (a.k.a. Nara Granite, Caledonia Granite, Caledonia Nara Brown Granite, Caledonia Nara Granite) - this has the appearance of an ordinary porphyritic granite with K-feldspar phenocrysts, but petrologic and regional geologic work shows that it is a charnockite (a porphyritic farsundite or porphyritic quartz mangerite, to be more specific). Geologic Unit & Age: Rivière-à-Pierre Plutonic Suite, Grenville Orogeny metamorphism, late Mesoproterozoic, ~1.1 Ga. Locality: quarry north of town of Rivière-à-Pierre, Portneuf County, southern Quebec, southeastern Canada. Charnockites are intrusive igneous rocks that are dark-colored and coarsely-crystalline. Mineralogically, charnockites have quartz, feldspar, and pyroxene. Many charnockites have been metamorphosed, sometimes with obvious foliation, but often with extremely subtle foliation, best seen in the black pyroxene component. The feldspar component of charnockite can “glimmer” when tilted in the light. |
| Date | |
| Source | Nara Brown Granite (charnockite/farsundite/quartz mangerite, Riviere-a-Pierre Plutonic Suite, ~1.1 Ga, Mesoproterozoic; north of Riviere-a-Pierre, Quebec, Canada) |
| Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14811421284. It was reviewed on 3 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 19:49, 3 August 2014 | | 2,292 × 2,207 (2.13 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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