Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2722
Authors: White, D. J.* 
Musacchio, G.* 
Helmstaedt, H. H.* 
Rarrab, R. M.* 
Thurston, P. C.* 
Van der Velden, A.* 
Hall, L.* 
Title: Images of a lower-crustal oceanic slab: Direct evidence for tectonic accretion in the Archean western Superior province
Issue Date: Nov-2003
Series/Report no.: v. 31; no. 11; 2003
DOI: 10.1130/G20014.1
URI: http://hdl.handle.net/2122/2722
Keywords: Archean
teconics
seismic
subduction
accretion
Subject Classification04. Solid Earth::04.07. Tectonophysics::04.07.01. Continents 
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics 
04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics 
04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes 
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics 
Abstract: 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.
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