Longitude: -81.87, Latitude: 50.32
The Hecla-Kilmer complex is completely covered by muskeg and glacial deposits, but aeromagnetic data indicate a complex of 18 km2. Drilling has proved the presence of essexite, ijolite, pyroxenite and nepheline syenite.
Rb-Sr data were obtained by Bell and Blenkinsop (1980, p.17) but did not define an isochron. A least-squares fit line placed through the data points indicated an age of 450 Ma, but this was not considered reliable.
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. SAGE, R.P. 1977. Carbonatite-alkalic complexes. Miscellaneous Paper, Ontario Geological Survey, 75: 69-79. R.P. Sage personal communication, 1983.