PIKE’S  PEAK  GRANITE

 

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

 


 

Pike’s Peak (looking west from between Colorado Springs and Manitou Springs).  All of the pinkish-red rocks are granites of the Pike’s Peak Batholith (1.08 b.y.).

 


 

Eastern side of summit of Pike’s Peak (looking ~SSW) & granites of the Pike’s Peak Batholith (1.08 b.y.).

 


 

View from Pike’s Peak summit (looking ~east toward the Great Plains & Colorado Springs urban area).

 


 

Pike’s Peak Batholith (looking ~ESE) - 1.08 b.y. coarsely-crystalline, porphyritic granites (pgpm2 facies) a little east of the summit house of Pike’s Peak.

 


 

View from Pike’s Peak summit (looking ~NNE toward the Front Range).

 


 

Pike’s Peak Granite (pgpm2 facies) from a little east of the summit house of Pike’s Peak.  This facies is coarsely- to very coarsely-crystalline and porphyritic.  It is dominated by K-feldspar, quartz, and biotite mica

 


 

 

Pike’s Peak Granite (pgpf dike facies) (left: 6.0 cm across at its widest; right: 6.1 cm across at its widest) from next to the summit house of Pike’s Peak, west of Colorado Springs, western El Paso County, central Colorado, USA (38° 50’ 29” North, 105° 02’ 29” West).  This facies is finely-crystalline, porphyritic, and reported to be fluoritic.

 


 

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

 


 

Pike’s Peak Granite (pgmc facies) (10.5 cm across) from the parking lot for the Pike’s Peak Cog Railway on the western side of the town of Manitou Springs, eastern base of Pike’s Peak, western El Paso County, central Colorado, USA (38° 51’ 20” North, 104° 55’ 58” West).  This facies is coarsely-crystalline and porphyritic.  It is dominated by K-feldspar, quartz, and some biotite mica.

 


 

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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