Physics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3720313w&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 20, CiteID L20313
Physics
4
Seismology: Lithosphere (1236), Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Lithospheric Flexure, Structural Geology: Regional Crustal Structure
Scientific paper
After maintaining elevations near sea level for over 500 million years, the Colorado Plateau (CP) has a present average elevation of 2 km. We compute new receiver function images from the first dense seismic transect to cross the plateau that reveal a central CP crustal thickness of 42-50 km thinning to 30-35 km at the CP margins. Isostatic calculations show that only approximately 20% of central CP elevations can be explained by thickened crust alone, with the CP edges requiring nearly total mantle compensation. We calculate an uplift budget showing that CP buoyancy arises from a combination of crustal thickening, heating and alteration of the lithospheric root, dynamic support from mantle upwelling, and significant buoyant edge effects produced by small-scale convecting asthenosphere at its margins.
Aster Richard
Baldridge Scott W.
Grand Stephen
Ni James
Wilson David C.
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