Alkaline Rocks and Carbonatites of the World

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Clay-Howells

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Occurrence number: 
031-00-065
Country: 
Canada
Region: 
Ontario
Location: 
Longitude: -82.08, Latitude: 49.83

An approximately circular intrusion of aegirine syenite about 13 km in diameter is intruded in its southeastern part by an arcuate mass of carbonatite some 900x100 m. The carbonatite consists of carbonate, garnet, amphibole and disseminated magnetite (10- 80%). Amphibole zones occur along the carbonatite-syenite contacts. The area is now extensively flooded from a hydro- electric dam.

Economic: 
A large tonnage of non-titaniferous magnetite has been indicated by drilling.
Age: 
1010 Ma by K-Ar on biotite (Gittins et al., 1967), while a whole rock Rb-Sr isochron gave 1072+-16 Ma (Bell and Blenkinsop, 1980, Table 3).
References: 
BELL, K. and BLENKINSOP, J. 1980. Grant 42 ages and initial 87Sr-86Sr ratios from alkalic complexes of Ontario. Miscellaneous Paper, Ontario Geological Survey, 93: 16-23. BENNETT, G., BROWN, D.D., GEORGE, P.T. and LEAHY, E.J. 1967. Operation Kapuskasing. Miscellaneous Paper, Ontario Department of Mines, 10: 1-98. GITTINS, J., MACINTYRE, R.M. and YORK, D. 1967. The ages of carbonatite complexes in eastern Canada. Canadian Journal of Earth Sciences, 4: 651-5
Fig. 32 Map and sections of the southeastern part of Clay-Howells (after Bennett et al., 1967, Fig. 14).
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith