EXPANDING SPREAD SEISMIC-REFLECTION SURVEY ACROSS THE SNAKE BAY - KAKAGI LAKE GREENSTONE-BELT, NORTHWESTERN ONTARIO

An expanding spread seismic reflection survey was conducted across the Snake Bay-Kakagi Lake greenstone belt in northwestern Ontario. Prominent early reflections were used to map a granite-greenstone contact to the south of the profile and a section of the Long Bay fault zone to the northeast of the profile. From the later reflections a model of the deep crust beneath the Snake Bay-Kakagi Lake greenstone belt was derived. This model, which represents a lateral extension of the Aulneau crustal model, consists fo a three-layered crust.