Alkaline Rocks and Carbonatites of the World

Funded by HiTech AlkCarb - New geomodels to explore deeper for Hi-Tech critical raw materials in Alkaline rocks and Carbonatites

Martison Lake

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Occurrence number: 
031-00-057
Country: 
Canada
Region: 
Ontario
Location: 
Longitude: -83.42, Latitude: 50.33

Drilling during 1981 into a long -nown aeromagnetic anomaly proved the presence of three carbonatite stocks, two of which probably coalesce. The area forms a distinct topographic depression which is covered by 30-90 m of glacial till. Associated with the carbonatite are ultramafic rocks described as "serpentinized olivine-calcite-phlogopite kimberlitic rocks and ultrabasic porphyry diatreme breccia" (Potapoff, in press). Fresh carbonatite averages 80% calcite or dolomite, 9% apatite, 10% magnetite, and pyrochlore, biotite, phlogopite and pyrite.

Economic: 
Overlying the carbonatite are leached zones enriched in phosphate (apatite, francolite and florencite) and pyrochlore. Proven, probable and possible reserves so far outlined total 145 million tonnes averaging 20.1% P2O5 and 0.35% Nl205 (Potapoff,in press).
References: 
Potapoff, in press. SAGE, R.P. 1979. Alkalic rocks carbonatite complexes. Miscellaneous Paper, Ontario Geological Survey, 90: 70-5
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith