Notes on the Shallow Thermal Regime of the Long Valley Caldera, Mono County, California
- Key words
- Reservoir Engineering; Exploration; USA; California; Mono; Long Valley Caldera; General; Assessment; Reservoir Parameters; Modeling; Temperature; Geophysical Surveys; Temperature Gradients; Hydrological Surveys; Aquifers
- Location
- Long Valley Caldera, California
- Conference
- Geothermal Resources Council Transactions
- Year
- 1980
- Session
- Well logging; Temperature gradients; Stratigraphy; Hydrogeol
- Language
- English
Abstract
Most of the intermediate depth (50-300 m) holes drilled in the eastern part of the Long Valley caldera that have high temperature gradients (>50°C/km) also have a temperature reversal at depth. Those that do not probably would show such a reversal if they were drilled an additional hundred meters or so. In each hole for which stratigraphic or lost circulation data are available, the temperate reversal takes place near a significant change in lithology or in or near a zone of notable fluid loss. The model that emerges is one that involves: 1) lateral subsurface spreading of hot water arising along nearby deeply penetrating conduits; and 2) the complex commingling of these hot waters with cold local recharge.
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