geothermal resource potential of the safford-san simon basin, arizona

are interpreted as evidence of a major Basin and Range fault zone.
The
gradients are caused by density and magnetic susceptibility differences
between basin-filling sediments and the crystalline bedrock exposed in the
mountains.
Dipole-dipole resistivity profiling parallel to the gradient and transverse
to the strike of the gravity and magnetic anomalies was done by Phoenix
Geophysics for the Arizona Bureau of Geology and Mineral Technology (ABGMT)
in 1979. Location of the profiles is shown in Figure 18. A 2,000-foot
electrode spacing was used in the survey and readings taken at a maximum of
five-electrode spacing (10,000 ft) in order to obtain resistivity information
up to 1 km depth.
Additional modeling of these data was done by William
Sill of the University of Utah Research Institute (UURI).
Basin stratigraphy
and structure is interpreted from the resistivity data (Figure 19 ).
Very low
resistivity,