Types, abundances and distribution of kimberlite indicator minerals in alluvial sediments, Wawa–Kinniwabi Lake area, Northeastern Ontario: implications for the presence of diamond-bearing kimberlite |
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| Authors: | T F Morris D Crabtree R P Sage S A Averill |
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| Institution: | aOntario Geological Survey, 933 Ramsey Lake Road, Sudbury, Ont., Canada P3E 6B5;bOntario Geoservices Centre, 933 Ramsey Lake Road, Sudbury, Ont., Canada P3E 6B5;cOverburden Drilling Management Limited, 107-15 Capella Court, Nepean, Ont., Canada K2E 7X1 |
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| Abstract: | In response to the discovery of diamonds within modern alluvium in the glaciated area of Wawa, Ontario, Canada, the Ontario Geological Survey undertook a regional program of surficial mapping and modern alluvial sediment sampling to assess the potential of the area for diamond-bearing kimberlite. Five varieties of kimberlite-derived indicator minerals were recovered and the composition of three varieties was evaluated, resulting in the identification of G10 Cr-pyrope garnet, inclusion field chromite and Mg-ilmenite. The distribution of indicator minerals was examined in the context of the glacial and bedrock geology. Glacial dispersal from non-kimberlitic marker units is restricted (commonly less than 200 m) and many kimberlite indicator minerals were recovered from samples collected close to cross-cutting NE–SW and NW–SE faults and a strong NE–SW trend in the bedrock associated with the Kapuskasing Structural Zone. From this, several potential exploration targets for diamond-bearing kimberlite are defined. |
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| Keywords: | kimberlite kimberlite indicator minerals alluvial sediments Kapuskasing structural zone |
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