Initial Results of Magnetotelluric Array Surveying at the Dixie Valley Geothermal Area, with Implications for Structural Controls and Hydrothermal Alteration

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Journal Article: Initial Results of Magnetotelluric Array Surveying at the Dixie Valley Geothermal Area, with Implications for Structural Controls and Hydrothermal Alteration

Abstract
A new generation MT array measurement system was applied in a contiguous bipole deployment at the Dixie Valley thermal area. Basic goals of the survey area are 1), resolve a fundamental structural ambiguity at the Dixie Valley thermal area (single range front fault versus shallower, stepped pediment; 2) delineate fault zones which have experienced fluid flux as indicated by low resistivity; 3) image the disposition of resistive, possible reservoir formations in the subsurface; and 4) from a generic standpoint, investigate the capability of fully sampled electrical data for resolving subsurface structure. MT surveying using a remote reference was carried out on three, 4-6 miles long profiles totaling 14 line miles, each crossing the Stillwater fault zone approximately at right angles, over the frequency range of 10 kHz to 0.03 Hz. These lines cross the Senator Fumaroles area, the Cottonwood Cree and main producing area, and the low permeability region through the section 10-15 area. Initial 2D investigation suggests that shallow pediment basement rocks extend for a considerable distance (1-1/2 km) southeastward from the topographic scarp of the Stillwater Range.

Author 
Philip E. Wannamaker








Published Journal 
Geothermal Resources Council, TRANSACTIONS, 2003





DOI 
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Online 
Internet link for Initial Results of Magnetotelluric Array Surveying at the Dixie Valley Geothermal Area, with Implications for Structural Controls and Hydrothermal Alteration

Citation

Philip E. Wannamaker. 2003. Initial Results of Magnetotelluric Array Surveying at the Dixie Valley Geothermal Area, with Implications for Structural Controls and Hydrothermal Alteration. Geothermal Resources Council, TRANSACTIONS. .


Related Geothermal Exploration Activities
Activities (1)


Areas (1)
  1. Dixie Valley Geothermal Area
Regions (0)