Alkaline Rocks and Carbonatites of the World

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Carb Lake

stripes

Occurrence number: 
031-00-043
Country: 
Canada
Region: 
Ontario
Location: 
Longitude: -92, Latitude: 54.07

The intrusion does not outcrop, but boulders of carbonatite and alkaline rocks have been found on the shore of Carb Lake. A strong, approximately circular magnetic anomaly has a diameter of about 3 km (Ferguson, 1971, Map). Drilling has indicated that the central area is underlain principally by carbonatite of about equal proportions of calcite and dolomite, with about 20% apatite, magnetite, biotite, pyrochlore and melanocratic rock fragments. Bands of the latter rock type, which appear to be vertical, consist of 30-60% magnetite, with apatite, a sodic amphibole, biotite, pyrite and pyrochlore. Fluorite, vermiculite, synchisite and ancylite have been identified.

Economic: 
Pyrochlore is widely disseminated, and the area has been investigated for its economic potential. Very high REE values have been found locally (72%).
References: 
FERGUSON, S.A. 1971. Columbium (niobium) deposits of Ontario. Mineral Resources Circular, Ontario Department of Mines and Northern Affairs, 14: 1-58
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith