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dc.contributor.authorWada, Ikuko  Concept link
dc.contributor.authorBehn, Mark D.  Concept link
dc.date.accessioned2016-02-19T21:47:10Z
dc.date.available2016-05-13T07:53:27Z
dc.date.issued2015-11-13
dc.identifier.citationGeochemistry, Geophysics, Geosystems 16 (2015): 3905–3923en_US
dc.identifier.urihttps://hdl.handle.net/1912/7801
dc.descriptionAuthor Posting. © American Geophysical Union, 2015. 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 16 (2015): 3905–3923, doi:10.1002/2015GC005950.en_US
dc.description.abstractWe use numerical models to investigate the effects of mineral grain size variation on fluid migration in the mantle wedge at subduction zones and on the location of the volcanic arc. Previous coupled thermal-grain size evolution (T-GSE) models predict small grain size (<1 mm) in the corner flow of the mantle wedge, a downdip grain size increase by ∼2 orders of magnitude along the base of the mantle wedge, and finer grain size in the mantle wedge for colder-slab subduction zones. We integrate these T-GSE modeling results with a fluid migration model, in which permeability depends on grain size, and fluid flow through a moving mantle matrix is driven by fluid buoyancy and dynamic pressure gradients induced by mantle flow. Our modeling results indicate that fluids introduced along the base of the mantle wedge beneath the fore arc are initially dragged downdip by corner flow due to the small grain size and low permeability immediately above the slab. As grain size increases with depth, permeability increases, resulting in upward fluid migration. Fluids released beneath the arc and the back arc are also initially dragged downdip, but typically are not transported as far laterally before they begin to travel upward. As the fluids rise through the back-arc mantle wedge, they become deflected toward the trench due to the effect of mantle inflow. The combination of downdip migration in the fore arc and trench-ward migration in the back arc results in pathways that focus fluids beneath the arc.en_US
dc.description.sponsorshipInternational Research Institute of Disaster Science, Tohoku University; NSF; MARGINS Postdoctoral Fellowship . Grant Number: NSF OCE-0840800en_US
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/2015GC005950
dc.subjectFluid migrationen_US
dc.subjectGrain size variationen_US
dc.subjectMantle wedgeen_US
dc.subjectVolcanic arcen_US
dc.subjectSubduction zoneen_US
dc.titleFocusing of upward fluid migration beneath volcanic arcs : effect of mineral grain size variation in the mantle wedgeen_US
dc.typeArticleen_US
dc.description.embargo2016-05-13en_US
dc.identifier.doi10.1002/2015GC005950


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