%0 Journal Article %1 3117704320080301 %A Reiter, Marshall %D 2008 %J Geological Society of America Bulletin %K COLORADO CRUST, EARTH EARTH, GRAVITY GRAVITY, GREAT Geothermal MANTLE, Mountain Plains, Plateau, Rocky Southern TERRESTRIAL and anomalies, crust flow, heat mantle, temperature, upper %N 3/4 %P 431 - 441 %T Geothermal anomalies in the crust and upper mantle along Southern Rocky Mountain transitions. %U http://(targetURLDomain)proxyhost.nmt.edu:2048/(targetURLRemainer) %V 120 %X Heat-flow, temperature gradient, and gravity data are analyzed along five profiles crossing from the Colorado Plateau or Great Plains to the high topographic areas of the Southern Rocky Mountains. These profiles cross large, negative, Bouguer gravity anomalies associated with the high topography in the region, and are within the area studied by two recent seismic investigations. The heat-flow and gravity profiles typically cross from maximum to minimum values in the region, allowing an FFT (fast Fourier transform) algorithm to be applied to the data so that high frequencies can be filtered. The resulting smoothed data can be fitted by the first few terms of a sine series to estimate mid-depths of crustal and upper mantle step sources, although anomalies could also be caused by different source geometries at much shallower or much deeper depths. The analysis provides a depth comparison for thermal- and gravity-anomaly sources modeled with similar geometries, and a comparison of thermal

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