Upper mantle P-wave velocity structure from PASSCAL teleseismic transects across Idaho, Wyoming and Colorado

Ken Dueker*, Huaiyu Yuan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article numberL08603
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Volume31
Issue number8
DOIs
Publication statusPublished - 28 Apr 2004
Externally publishedYes

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