Alkaline Rocks and Carbonatites of the World

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

Rainy Ridge

stripes

Occurrence number: 
031-00-205
Country: 
Canada
Region: 
Alberta
Location: 
Longitude: -114.38, Latitude: 49.25
Carbonatite: 
No

Rainy Ridge of southwestern Alberta, Canada hosts a 5-7 m thick analcime phonolite sill, emplaced within the Gateway Formation of the Proterozoic Purcell Supergroup. It appears pale graygrey and massive, with phenocrysts of sanidine, aegirine-augite, melanite garnet, analcime, hastingsite, titanite, and apatite forming ~12% of the rock. The gGroundmass consists of sanidine microlites, analcime, aegirine-augite, hastingsite, and hydrogarnet. In weathered sections, analcime pseudomorphs of sodalite and muscovite are present. This sill is thought to be linkedmay be genetically to the Crowsnest Volcanics 20 km to the north. Mineral chemical and whole rock data can be found in Goble et al., (1993).

Age: 
If related to Crowsnest Volcanics, ~100 Ma (Goble et al., 1993)
References: 
GOBLE, R.J., TREVES, S.B. & GHAZI, A.M., 1993. Comparison of the Rainy Ridge analcime phonolite sill and the Crowsnest volcanics, Alberta, Canada. Canadian Journal of Earth Sciences. 30 pp 1644-1649
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith