The Mount Rosa Complex (MRC), located in the Colorado Front Range, extends from St. Peters Dome in the south to Mount Buckhorn to the north and east of Cheyenne Canyon. The complex lies in the southern part of the Pikes Peak Intrusive Center within the larger 1.08 Ga Pikes Peak Batholith. The Pikes Peak Intrusive Center is a composite intrusion composed of a series of granitic plutons that range from 2 to 8 kilometers in size (Wobus 1976). The individual plutons are characterized on the basis of alkali content, with greater than 90% of the rocks composed of...

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