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Geology; March 1995; v. 23; no. 3; p. 195-199; DOI: 10.1130/0091-7613(1995)023<0195:PCOBTW>2.3.CO;2
© 1995 Geological Society of America
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Paleoproterozoic collisional orogen beneath the western Canada sedimentary basin imaged by Lithoprobe crustal seismic-reflection data

Gerald M. Ross1, Bernd Milkereit2, David Eaton2, Don White2, Ernest R. Kanasewich3 and Michael J. A. Burianyk3

1 Geological Survey of Canada, 3303 33rd Street N.W., Calgary, Alberta T2L 2A7, Canada
2 Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0E3, Canada
3 Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1, Canada

Exceptionally clear images of crustal structure of the Canadian Shield that underlies the western Canada sedimentary basin beneath 3.5–2.2 km of Phanerozoic sedimentary strata have been obtained on a seismic-reflection profile acquired by Lithoprobe. The profile crosses tectonic domains of central Alberta and delineates a major buried orogenic belt of Paleoproterozoic (~1.8 Ga) age associated with crustal scale thrust imbrication and deflections in the crust-mantle boundary. Available geochronologic data suggest that crustal imbrication observed in the Alberta basement was coeval with that documented in the Trans-Hudson orogen to the east (1.80–1.83 Ga) and implies that a large region of continental crust, extending >1000 km from the western Superior province to the Snowbird tectonic zone, underwent considerable shortening during assembly of this part of the Canadian Shield.




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