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dc.contributor.authorBillen, Magali I.  Concept link
dc.contributor.authorHirth, Greg  Concept link
dc.date.accessioned2010-04-19T20:00:00Z
dc.date.available2010-04-19T20:00:00Z
dc.date.issued2007-08-28
dc.identifier.citationGeochemistry Geophysics Geosystems 8 (2007): Q08012en_US
dc.identifier.urihttps://hdl.handle.net/1912/3255
dc.descriptionAuthor Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 8 (2007): Q08012, doi:10.1029/2007GC001597.en_US
dc.description.abstractSeveral models have been proposed to relate slab geometry to parameters such as plate velocity or plate age. However, studies on the observed relationships between slab geometry and a wide range of subduction parameters show that there is not a simple global relationship between slab geometry and any one of these other subduction parameters for all subduction zones. Numerical and laboratory models of subduction provide a method to explore the relative importance of different physical processes in determining subduction dynamics. Employing 2-D numerical models with a viscosity structure constrained by laboratory experiments for the deformation of olivine, we show that the observed range in slab dip and the observed trends between slab dip and convergence velocity, subducting plate age, and subduction duration can be reproduced without trench motion (i.e., slab roll-back) for locations away from slab edges. Successful models include a stiff slab that is 100–1000 times more viscous than previous estimates from models of plate bending, the geoid, and global plate motions. We find that slab dip in the upper mantle depends primarily on slab strength and plate boundary coupling, with a small dependence on subducting plate age. Once the slab sinks into the lower mantle the primary processes controlling slab evolution are (1) the ability of the stiff slab to transmit stresses up dip, (2) resistance to slab descent into the higher-viscosity lower mantle, and (3) subduction-induced flow in the mantle-wedge corner.en_US
dc.description.sponsorshipThis research was partially supported by NSF award EAR0125919.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2007GC001597
dc.subjectSubductionen_US
dc.subjectRheologyen_US
dc.subjectMantle dynamicsen_US
dc.subjectPlate tectonicsen_US
dc.subjectSlab morphologyen_US
dc.titleRheologic controls on slab dynamicsen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2007GC001597


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