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


Occurrence number: 
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.

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).
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