Age of the Mulcahy Lake intrusion, northwest Ontario, and implications for the evolution of greenstone-granite terrains

@inproceedings{Morrison1985AgeOT,
  title={Age of the Mulcahy Lake intrusion, northwest Ontario, and implications for the evolution of greenstone-granite terrains},
  author={Donald A. Morrison and Donald Wayne Davis Davis and Joseph L. Wooden and Donald D. Bogard and D. E. MacZuga and William C. Phinney and Lewis D. Ashwal},
  year={1985}
}
Abstract Zircon data from a 63 km 2 layered mafic intrusion in the Wabigoon subprovince, the Mulcahy Lake gabbro, show that the gabbro crystallized at 2733.2 −0.9 +1.0 Ma. The largely unaltered and unmetamorphosed gabbro intrudes tholeiites of the Crow Lake-Savant Lake greenstone belt which were generated over at least a 10 Ma time span. Rb Sr and Sm Nd data were obtained for pristine whole rock and mineral separates from the intrusion. The Rb Sr data show disturbances in the system… CONTINUE READING