Alkaline Rocks and Carbonatites of the World

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Kamloops

stripes

Occurrence number: 
031-00-028
Country: 
Canada
Region: 
British Columbia
Location: 
Longitude: -120.07, Latitude: 50.07

Alkaline rocks occur in an elliptical pluton 3x1.5 km elongated east-west, and a smaller crescent-shaped body to the south. The main intrusion is zoned from a marginal syenite, which may contain minor quartz, to a central natrolite syenite in which the natrolite and cancrinite are after nepheline, only rare remnants of which persist. Zoned microcline phenocrysts lie in a groundmass of albite, aegirine, partly replaced by hastingsite, a zoned yellow garnet and zircon. A tentative identification of eudialyte has been made. Magnetite, pyrrhotine and chalcopyrite are locally abundant.

Economic: 
A low grade Cu mineralization is present.
Age: 
Not known. Nearby calc-alkaline intrusions give maximum ages by K-Ar on biotite of 200 Ma.
References: 
CURRIE, K.L. 1976a. The alkaline rocks of Canada. Bulletin, Geological Survey of Canada, 239: 1-228
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith