stripes
Occurrence number:
174-00-088
Country:
United States
Region:
Colorado
Location:
Longitude: -105.55, Latitude: 38.42
Carbonatite:
Yes
At McCoy Gulch carbonatite occurs as small lenses in lamprophyre and as a 0.6 m thick dyke. In the dyke the carbonatite develops granular, colloform and brecciated variants and consists mainly of calcite with hematite and a little baryte, apatite, magnetite, pyrite and feldspar. Adjacent gneisses are fenitized. REE are absent and Sr and Ba unusually low for a carbonatite.
References:
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: