Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9548
AuthorsPersaud, P.* 
Di Luccio, F.* 
Clayton, R.* 
TitleRayleigh wave dispersion measurements reveal low-velocity zones beneath the new crust in the Gulf of California
Issue DateMar-2015
Series/Report no./42 (2015)
DOI10.1002/2015GL063420
URIhttp://hdl.handle.net/2122/9548
KeywordsLow velocities in the Gulf upper mantle are interpreted as partial melting
Partial melting under the Guaymas Basin and off axis of the other rift basins
Lower crustal flow assisted by heat source in N Gulf near mantle upwelling
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.03. Mantle and Core dynamics 
04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy 
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics 
AbstractRayleigh wave tomography provides images of the shallow mantle shear wave velocity structure beneath the Gulf of California. Low-velocity zones (LVZs) are found on axis between 26 and 50 km depth beneath the Guaymas Basin but mostly off axis under the other rift basins, with the largest feature underlying the Ballenas Transform Fault. We interpret the broadly distributed LVZs as regions of partial melting in a solid mantle matrix. The pathway for melt migration and focusing is more complex than an axis-centered source aligned above a deeper region of mantle melt and likely reflects the magmatic evolution of rift segments. We also consider the existence of solid lower continental crust in the Gulf north of the Guaymas Basin, where the association of the LVZs with asthenospheric upwelling suggests lateral flow assisted by a heat source. These results provide key constraints for numerical models of mantle upwelling and melt focusing in this young oblique rift.
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