Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

Amethyst And Gribble Mountain

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Occurrence number: 
174-00-085
Country: 
United States
Region: 
Colorado
Location: 
Longitude: -105.47, Latitude: 38.52
Carbonatite: 
Yes

Within an area of 1000x300 m about 10 silico-carbonatite dykes up to 10 m thick, trending north-northwest-south-southeast, cut the Precambrian Pikes Peak granite. The largest dyke has a hanging wall of red, hematite-rich potassic fenite. The carbonatite consists essentially of calcite, baryte and hematite. Cutting the highly brecciated fenite and adjacent granite are veins rich in amethyst and smoky quartz. Heinrich and Salotti (1975, Fig. 1) indicate the presence of carbonatite nearby at Gribble Mountain.

References: 

HEINRICH, E.W. and SHAPPIRIO, J.R. 1966. Alkalic rocks and carbonatites of the Arkansas River Canyon, Fremont County, Colorado. 3. The Amethyst carbonatites. American Mineralogist, 51: 1088-106.
HEINRICH, E.W. and SALOTTI, C.A. 1975. A colloform carbonatite, McCoy Gulch, Fremont County, Colorado. Mountain Geologist, 12: 103-11

Map: 
Fig. 1_156 The Wet Mountains alkaline province (based on Armbrustmacher, 1984a, Fig. 1 and Heinrich and Salotti, 1975, Fig. 1).
Location: 
All locations > North America > United States > Colorado
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith