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File:Porphyritic granite (pgpm2 facies, Pikes Peak Batholith, Mesoproterozoic, 1.08 GA; Pikes Peak, Colorado, USA) 3.jpg

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English: Porphyritic granite from the Precambrian of Colorado, USA. (~5.3 centimeters across at its widest)

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, Precambrian-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).

This sample is a coarsely-crystalline porphyritic granite with quartz, potassium feldspar, and biotite mica.

Geologic unit: pgpm2 facies, Pikes Peak Batholith, late Mesoproterozoic, 1.08 Ga

Locality: loose piece from just east of summit house atop Pikes Peak, west of the town of Colorado Springs, western El Paso County, central Colorado, USA (38° 50’ 29” North latitude, 105° 02’ 29” West longitude)

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@N05/31675771636/
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@N05/31675771636 (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 20192,541 × 1,804 (2.69 MB)Ser Amantio di Nicolao (talk | contribs)User created page with UploadWizard

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