 | | Journal (article/letter/editorial) | | PETROLOGY AND MINERALOGY OF THE MOUNT ROSA AREA, EL PASO AND TELLER COUNTIES, COLORADO. II. PEGMATITESI EuceNB...Michigan. Aesrnlcr Two contrasting swarms of pegmatite dikes occur intermingled in the Pikes Peak granite...in related alkalic granites in the Mount Rosa area, west of Colorado Springs. One is the older calc-alkalic...younger is the alkalic Mount Rosa type. The accessory assemblage of the Mount Rosa quartz-microcline-riebeckite...determinations on zircons from pegmatites of the Mount Rosa type proved to be inconsistent, but ages determined |
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