Geothermometry At Lassen Volcanic National Park Area (Janik & Mclaren, 2010)
Exploration Activity: Geothermometry At Lassen Volcanic National Park Area (Janik & Mclaren, 2010)
|Exploration Activity Details|
|Location||Lassen Volcanic National Park Area|
Analyses of eight well samples taken consecutively during the flow test showed an inverse correlation between NH3 and Cl_ concentrations. The last sample taken had a pH of 8.35 and contained 2100 ppm Cl_ and 0.55 ppm NH3. Ratios of Na+/K+ and Na+/Cl_ remained nearly constant throughout the flow test. Cation geothermometers (with inherent uncertainties of at least ±5-10 degrees C; Fournier, 1992) applied to the last six samples yielded nearly the same temperatures, averaging 231±3 degrees C. These are slightly higher than the reported cation geothermometer temperatures of 223 degrees C (Muffler et al., 1982) and 229 degrees C (Thompson, 1985) reported for Growler Hot Spring water, but are within the 220-240 degrees C range calculated using cation, sulfate-water isotope, and mixing model geothermometers (Muffler et al., 1982).
- Cathy J. Janik, Marcia K. McLaren (2010) Seismicity And Fluid Geochemistry At Lassen Volcanic National Park, California- Evidence For Two Circulation Cells In The Hydrothermal System