Initial Results from Drillholes PLV-1 and PLV-2 in the Western Moat of the Long Valley Caldera

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Conference Paper: Initial Results from Drillholes PLV-1 and PLV-2 in the Western Moat of the Long Valley Caldera

Abstract
Core holes PLV-1 and PLV-2 are long the first intermediate depth geothermal exploration holes to be located in the western moat of the Long Valley caldera. PLV-1 was drilled through a sequence of moat rhyolite lava flows and tuffs and terminated in hydrothermally altered tuffs of the early rhyolite. PLV-2 was drilled through the moat basalt flows, a telescoped moat rhyolite sequence, and into the early rhyolite flows and tuffs. The temperature profile from PLV-1 shows irregular and isothermal intervals created by downward moving meteoric water through hard fractured lavas to a depth of 1800 feet. Below 1800 feet the temperature gradient abruptly increase in soft impermeable tuffs to 36°F/100'. PLV-2 has an irregular temperature profile which can not be used for extrapolation purposes. PLV-1 offers the first direct evidence that a geothermal reservoir is located to the west of Casa Diablo Hot Springs, however little yet can be said about the location, size, or depth of this reservoir.

Author 
Walter R. Benoit






Conference 
GRC Annual Meeting; Reno, NV; 1984


Published 
Geothermal Resources Council, 1984





DOI 
Not Provided
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Online 
Internet link for Initial Results from Drillholes PLV-1 and PLV-2 in the Western Moat of the Long Valley Caldera

Citation

Walter R. Benoit. 1984. Initial Results from Drillholes PLV-1 and PLV-2 in the Western Moat of the Long Valley Caldera. In: Transactions. GRC Annual Meeting; 1984; Reno, NV. Reno, NV: Geothermal Resources Council; p. 397-402


Related Geothermal Exploration Activities
Activities (1)


Areas (1)
  1. Long Valley Caldera Geothermal Area
Regions (0)