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Rayleigh wave dispersion measurements reveal low-velocity zones beneath the new crust in the Gulf of California

Persaud, Patricia and Di Luccio, Francesca and Clayton, Robert W. (2015) Rayleigh wave dispersion measurements reveal low-velocity zones beneath the new crust in the Gulf of California. Geophysical Research Letters, 42 (6). pp. 1766-1774. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20150515-152216867

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Abstract

Rayleigh 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2015GL063420 DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2015GL063420/abstractPublisherArticle
ORCID:
AuthorORCID
Clayton, Robert W.0000-0003-3323-3508
Additional Information:© 2015 American Geophysical Union. Received 9 FEB 2015; Accepted 2 MAR 2015; Accepted article online 5 MAR 2015; Published online 30 MAR 2015. We thank L. Ferrari and S. Bryan for their review and useful discussions on the tectonics and volcanism in the southern Gulf of California, J. Contreras-Pérez for his thoughtful review of the manuscript, and V. Langenheim for providing the magnetic potential data for the study region. We also thank an anonymous reviewer and the Editor for their help in improving the final manuscript. Some figures were generated using the GMT software [Wessel and Smith, 1998]. The Editor thanks Peter Clift for his assistance evaluating this paper.
Group:Seismological Laboratory
Subject Keywords:off-axis partial melt; lower crustal flow; oblique rifting; surface wave tomography
Record Number:CaltechAUTHORS:20150515-152216867
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150515-152216867
Official Citation:Persaud, P., F. Di Luccio, and R. W. Clayton (2015), Rayleigh wave dispersion measurements reveal low-velocity zones beneath the new crust in the Gulf of California. Geophys. Res. Lett., 42, 1766–1774. doi: 10.1002/2015GL063420
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57573
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 May 2015 23:37
Last Modified:31 Jan 2017 20:39

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