To Lovelock

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McKinney Pass
To Lovelock
Humboldt Range
Buena Vista Valley
N
Sou Hills
Fencemaker Pass
Coal Canyon Road
To Winnemucca, Battle Mountain
Carson Sink
Fault
Stillwater Range
Route 121
Geothermal Plant
study area
Valley
To Hwy 50
Dixie Valley
Dixie
Clan Alpine Mountains
0 KM 10
0 Miles 5
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7040 ft
3700 ft
STILLWATER RANGE STRUCTURE
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Stillwater Range upthrown block
1500 m
Dixie Valley Fault
Reservoir downthrown block
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• TECTONIC STRUCTURE
• FOUR SETS OF FAULTS
• MESOZOIC TO PRESENT

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• SIMILAR SUBSURFACE STRUCTURE
• Borehole logs
• Surface relationships

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• CONSTRAINTS ON GEOMETRY OF THE DIXIE VALLEY FAULT
• Inactive splays exposed at the surface
• Shallow basement block from seismic model
• Measured surface dip
• Dip in boreholes

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• SUMMARY
• Tectonic Stratigraphy is Similar in Footwall and
  Hanging wall. This is nothing new.
• Shape of the master rangefront is most likely
  ramp-flat. This is based on structural
  observations.
• Fault sets in the Rangefront appear to be
  present in the subsurface

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• CONCLUSIONS
• Fault geometry may influence fracture
  orientation, and therefore may influence which
  fractures are open.
• The question of fault geometry is important to
  future studies
• Dave Blackwell is somewhat suspicious of seismic
  images