File:Coarsely-crystalline porphyritic granite (Pikes Peak Batholith (pgpm2 facies), Mesoproterozoic, 1.08 Ga; a little east of summit house atop Pikes Peak, central Colorado, USA) 1.jpg

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English: Pikes Peak Granite (pgpm2 facies) (12.0 centimeters across) from a little east of the summit house of Pikes Peak. This facies is coarsely- to very coarsely-crystalline and porphyritic. It is dominated by K-feldspar, quartz, and biotite mica.

One of the most visited mountain peaks in the American Cordillera is central Colorado’s Pikes Peak. The rocks of this mountain & surrounding area represent the Pikes Peak Batholith, a fairly large, late Mesoproterozoic-aged igneous intrusion that was emplaced 1.08 billion years ago. Published research on the Pikes Peak Batholith has shown that several igneous facies are present (e.g., Hutchinson, 1987).

Reference cited:

Hutchinson, R.M. 1987. Granite-tectonics of the Pikes Peak intrusive center of Pikes Peak composite batholith, Colorado. Geological Society of America Centennial Field Guide 2: 331-334.
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Source https://www.flickr.com/photos/47445767@N05/15025097545/
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@N05/15025097545 (archive). It was reviewed on 24 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

24 December 2019

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current20:27, 24 December 2019Thumbnail for version as of 20:27, 24 December 20191,248 × 938 (1.2 MB)Ser Amantio di Nicolao (talk | contribs)User created page with UploadWizard

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