A description of colored gravity maps of the Basin and Range Province, Southwestern United States

1982 ◽  
Author(s):  
T.G. Hildenbrand ◽  
R.P. Kucks
Keyword(s):  
United States ◽  
Basin And Range ◽  
Southwestern United States ◽  
Basin And Range Province

A COMPARISON OF TERRESTRIAL HEAT FLOW AND TRANSIENT GEOMAGNETIC FLUCTUATIONS IN THE SOUTHWESTERN UNITED STATES

Geophysics ◽  
1969 ◽  
Vol 34 (3) ◽  
pp. 463-478 ◽  
Author(s):  
Robert E. Warren ◽  
John G. Sclater ◽  
Victor Vacquier ◽  
Robert F. Roy
Keyword(s):  
United States ◽  
Heat Flow ◽  
Upper Mantle ◽  
Basin And Range ◽  
High Heat ◽  
Fault System ◽  
Southwestern United States ◽  
Basin And Range Province ◽  
Magnetotelluric Data ◽  
Time Variations

Magnetic time‐variations between Tucson, Arizona and Sweetwater, Texas indicate that a zone of high electrical conductivity underlies the southwestern United States. The interpretation of this zone by Schmucker as a rise of the isotherms in the upper mantle is supported by six heat flow observations along the line of the geomagnetic profile. These and other observations indicate a high but variable heat flow in the Basin and Range Province which contrasts strongly with the uniform values of [Formula: see text] reported for the Texas Foreland. The width of this high heat flow anomaly, which may extend across the entire Basin and Range Province, suggests anomalously high temperatures in the upper mantle. This interpretation is further supported by magnetotelluric data between Phoenix, Arizona and Roswell, New Mexico and by the low seismic [Formula: see text] velocity and negative gravity anomaly. It is suggested that the “anomalous mantle” may be related to the tectonic evolution of the western United States and the late Cenozoic fault system.

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