| Title | Notes on the Shallow Thermal Regime of the Long Valley Caldera, Mono County, California |
|---|---|
| Authors | Diment, W. H.; Urban, T. C.; Nathenson, Manual |
| Year | 1980 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Reservoir Engineering; Exploration; USA; California; Mono; Long Valley Caldera; General; Assessment; Reservoir Parameters; Modeling; Temperature; Geophysical Surveys; Temperature Gradients; Hydrological Surveys; Aquifers |
| 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. |