Possible emplacement of crustal rocks into the forearc mantle of the Cascadia Subduction Zone

Details Possible emplacement of crustal rocks into the forearc mantle of the Cascadia Subduction Zone Possible emplacement of crustal rocks into the forearc mantle of the Cascadia Subduction Zone

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30wsde3c&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 23, pp. SDE 3-1, CiteID 2196, DOI 10.1029/2003GL018541

Physics

Geophysics

5

Exploration Geophysics: Continental Structures (8109, 8110), Tectonophysics: Continental Margins And Sedimentary Basins (1212), Tectonophysics: Tomography

Scientific paper

Seismic reflection profiles shot across the Cascadia forearc show that a 5-15 km thick band of reflections, previously interpreted as a lower crustal shear zone above the subducting Juan de Fuca plate, extends into the upper mantle of the North American plate, reaching depths of at least 50 km. In the extreme western corner of the mantle wedge, these reflectors occur in rocks with P wave velocities of 6750-7000 ms-1. Elsewhere, the forearc mantle, which is probably partially serpentinized, exhibits velocities of approximately 7500 ms-1. The rocks with velocities of 6750-7000 ms-1 are anomalous with respect to the surrounding mantle, and may represent either: (1) locally high mantle serpentinization, (2) oceanic crust trapped by backstepping of the subduction zone, or (3) rocks from the lower continental crust that have been transported into the uppermost mantle by subduction erosion. The association of subparallel seismic reflectors with these anomalously low velocities favours the tectonic emplacement of crustal rocks.

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