Mercury Geochemical, Groundwater Geochemical, And Radiometric Geophysical Signatures At Three Geothermal Prospects In Northern Nevada

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Conference Paper: Mercury Geochemical, Groundwater Geochemical, And Radiometric Geophysical Signatures At Three Geothermal Prospects In Northern Nevada

Abstract
Ground water sampling, desorbed mercury soil geochemical surveys and a radiometric geophysical survey was conducted in conjunction with geological mapping at three geothermal prospects in northern Nevada. Orientation sample lines from 610 m (2000 ft.) to 4575 m (15,000 ft.) in length were surveyed at right angles to known and suspected faults. Scintillometer readings (gamma radiation - total counts / second) were also recorded at each soil sample station. At the Reese River prospect, a 60 station sample line crosses a pull-apart basin in the northern Shoshone Range. The eastern third of the sample line crosses a known 514 0C/km (330F/100 ft.) heat flow anomaly defined by previous drilling. Desorbed mercury anomalies in the 0.5 ppb to 1.0 ppb range correlate well with the location of known and suspect faults. Radiometric data, while useful at this prospect are not as effective a tool as mercury data for mapping structure because of the masking effect of widespread alluvial deposits. At the Salt Wells prospect, the 26 station sample line crosses a previously mapped basin/playa bounding fault and a suspected buried fault indicated by the location of a warm spring. Elevated mercury concentrations are detected at the fault trace and in the vicinity of the spring, in addition to anomalous radioactivity. At the Silver Peak prospect, a basin/playa bounding fault is defined by both mercury vapor and radioactivity anomalies along the 14 station sample line. Mercury anomalies in the 2.0 to 6.0 ppb range and radioactivity anomalies in the + 500 CPS range mark both the location of the fault and associated sub-cropping hot springs sinter (mixed travertine - silica) deposits. A detailed radiometric survey along 4.5 km of strike of the basin bounding fault detects three dormant hot spring vent areas.

Authors 
William R. Henkle Jr., Wayne C. Gundersen and Thomas D. Gundersen








Published 
GRC, 2005





DOI 
Not Provided
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Citation

William R. Henkle Jr.,Wayne C. Gundersen,Thomas D. Gundersen. 2005. Mercury Geochemical, Groundwater Geochemical, And Radiometric Geophysical Signatures At Three Geothermal Prospects In Northern Nevada. In: (!) ; (!) ; (!) . (!) : GRC; p. (!)


Related Geothermal Exploration Activities
Activities (14)


Areas (4)
  1. Reese River Area

  2. Silver Peak Area

  3. Salt Wells Geothermal Area

  4. Salt Wells Area
Regions (0)