COMPARATIVE PETROLOGY AND MINERALOGY OF PEGMATITES FROM THE PIKES PEAK BATHOLITH, COLORADO
The fact that the pegmatite with no amazonite occurs at a higher elevation than the amazonite-bearing pegmatite poses a problem: amazonite is favored nearer the top of the magma chamber, and therefore at higher elevations than at lower. These pegmatites are separated by 700 vertical feet, a relatively short distance when the size of the batholith is considered. If the simple pegmatite is structurally related to the amazonite, and in place, one would expect their elevations to be reversed. Since this paper will only compare their structural relationships, age dates and melt interactions of the pegmatites will be obtained and compared at a later stage in this project.
Perthite is present throughout the microcline in the pegmatite, with the bulk of it being albitic at the pocket and nearly equal Na and K perthite in the lower portions. This provides an opportunity for thermobarometry of this pegmatite based on its perthite content; the same will be done for the amazonite pegmatites for comparison. This will help test whether faulting may have displaced the pegmatites after their formation.