A tomographic glimpse of the upper mantle source of magmas of the Jemez lineament, New Mexico
Journal of Geophysical Research
By: W. Spence and R.S. Gross
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Abstract
To infer spatial distributions of partial melt in the upper mantle source zones for the Rio Grande rift and the Jemez lineament, the lateral variations of P wave velocity in the upper mantle beneath these features has been investigated. Teleseismic P wave delays recorded at a 22-station network were used to perform a damped least squares, three-dimensional inversion for these lateral variations. Results infer that a large magmatic source zone exists beneath the Jemez lineament but not beneath the Rio Grande rift. This implies that the volcanic potential of the Jemez lineaments continues to greatly exceed that of the Rio Grande rift. The magmatic source zones of the Jemez lineament are modeled as due to clockwise rotation of the Colorado Plateau about a pole in northeastern Colorado. This rotation caused extension of the lithosphere beneath the Jemez lineament, permitting concentration there of partially melted rock in the upper mantle. -from Authors
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A tomographic glimpse of the upper mantle source of magmas of the Jemez lineament, New Mexico |
| Series title | Journal of Geophysical Research |
| Volume | 95 |
| Issue | B7 |
| Year Published | 1990 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Geophysical Research |
| Google Analytic Metrics | Metrics page |