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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 | Journal: | Geology | Series/Report no.: | v. 31; no. 11; 2003 | Publisher: | Geological Society of America | Issue Date: | Nov-2003 | DOI: | 10.1130/G20014.1 | Keywords: | Archean teconics seismic subduction accretion |
Subject Classification: | 04. 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. |
Appears in Collections: | Article published / in press |
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