Evidence for an upper mantle low velocity zone beneath the southern Basin and Range-Colorado Plateau transition zone

Geophysical Research Letters
By:  and 

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Abstract

A 370-km-long seismic refraction/wide-angle reflection profile recorded during the Pacific to Arizona Crustal Experiment (PACE) detected an upper mantle P-wave low-velocity zone (LVZ) in the depth range 40 to 55 km beneath the Basin and Range in southern Arizona. Interpretation of seismic data places constraints on the sub-crustal lithosphere of the southern Basin and Range Province, which is important in light of the active tectonics of the region and the unknown role of the sub-crustal lithosphere in the development of the western United States. Forward travel time and synthetic seismogram techniques are used to model this shallow upper mantle LVZ. Modeling results show that the LVZ is defined by a 5% velocity decrease relative to a Pn velocity of 7.95 km s−1, suggesting either a ∼3–5% mafic partial melt or high-temperature, sub-solidus peridotite.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Evidence for an upper mantle low velocity zone beneath the southern Basin and Range-Colorado Plateau transition zone
Series title Geophysical Research Letters
DOI 10.1029/93GL01660
Volume 21
Issue 7
Year Published 1994
Language English
Publisher Wiley
Description 4 p.
First page 509
Last page 512