Physics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3108603d&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 8, CiteID L08603
Physics
3
Seismology: Lithosphere And Upper Mantle, Tectonophysics: Continental Tectonics-General (0905), Tectonophysics: Dynamics Of Lithosphere And Mantle-General
Scientific paper
Inversion of teleseismic P-time residuals along two linear seismic arrays provides well-resolved inverse images of the upper mantle. Low velocity bodies beneath the Yellowstone Hotspot Track and the Grand Mesa volcanic field in western Colorado are similar in shape and magnitude. In the two places where our transects cross the 1.78 Ga Archean-Proterozoic Cheyenne suture, high velocities are imaged to 150 km. Beneath the Leucite Hills volcanic field in Wyoming a small upper mantle low velocity body is imaged. Whether these anomalies are lithospheric or asthenospheric in origin is poorly constrained, but the consistent high velocities beneath the Cheyenne suture suggest a lithospheric origin. Likewise, the lack of extension beneath the western Colorado volcanic fields suggests that a low-solidus lithosphere is being disturbed by a regional heating event.
Dueker Ken
Yuan Huaiyu
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