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Geology; November 2003; v. 31; no. 11; p. 997-1000; DOI: 10.1130/G20014.1
© 2003 Geological Society of America
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Images of a lower-crustal oceanic slab: Direct evidence for tectonic accretion in the Archean western Superior province

D.J. White1, G. Musacchio*,2, H.H. Helmstaedt*,2, R.M. Harrap*,2, P.C. Thurston*,3, A. van der Velden*,4 and K. Hall*,4

1 Geological Survey of Canada, 615 Booth Street, Ottawa, Ontario K1A 0E9, Canada
2 Department of Geological Sciences, Queen's University, Kingston, Ontario K7L 3N6, Canada
3 Ontario Geological Survey, 933 Ramsay Lake Road, Sudbury, Ontario P3E 6B5, Canada
4 Department of Geology and Geophysics, University of Calgary, Calgary, Alberta T2N 1N4, Canada

The Archean western Superior province in Canada is the type area for proposed Archean plate tectonics. Seismic images from this region provide direct evidence for assembly of the craton by terrane accretion and for a large slab of remnant oceanic crust preserved at the base of the crust. This slab, with inferred garnet amphibolite composition, adds a critical piece of evidence to previous suggestions that Archean subduction was at a shallow angle and that some Neoarchean tonalite-trondhjemite-granodiorite suites, distinct from most modern-day suprasubduction magmas, are melts primarily derived directly from subducted slabs.

Key Words: Archean • tectonics • seismic • subduction • accretion




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