ABSTRACT: New Seismic and Aeromagnetic Data in Southern Ontario
Dave Forsyth, Don White, Maurice Coyle, George LeBlanc, Geological Survey of Canada, Ottawa, ON, Canada, and Timo Von Rudloff, Talisman Energy, Calgary, AB, Canada
A new, high-resolution aeromagnetic database of over 82,000 line km was established during the summer of 1999 to improve the resolution of magnetic anomaly data in one of the most populous areas of eastern North America. The survey was supported by Ontario Power Generation, the Geological Survey of Canada and the Multidisciplinary Center for Earthquake Engineering Research. A major seismic reflection program to study the Earth's crust beneath southern Ontario was conducted during May-June 2000. The seismic program is a partnership effort involving Lithoprobe, Ontario Power Generation, the Geological Survey of Canada and Talisman Energy.
Crystalline rocks of the Grenville orogen extend from the surface to depths of perhaps 1000 m beneath and around southeastern Ontario. The role of the Grenville basement structure in affecting deposition and adjustment of the overlying Paleozoic sediments and the distribution of hydrocarbon resources is enigmatic. The relationship of earthquakes to crustal structure is just as conjectural as the continuing debate on the structural significance of magnetic and gravity anomalies in the Lake Ontario-Lake Erie area. As a consequence, our very incomplete knowledge of the Precambrian structure is continually stretched to address an increasing requirement for answers to issues ranging from hazards associated with seismicity and transportation of toxic or nuclear goods to mine development, water reservoir distribution or quality and hydrocarbon distribution. An integrated interpretation of recent aeromagnetic data and Lithoprobe and industry seismic data will help develop an improved crustal model for southern Ontario and a better response to these demands.
Search and Discovery Article #90907©2000 AAPG Eastern Section Meeting, London, Ontario, Canada