Compound and Elemental Analysis At Lassen Volcanic National Park Area (Janik & Mclaren, 2010)
Exploration Activity: Compound and Elemental Analysis At Lassen Volcanic National Park Area (Janik & Mclaren, 2010)
|Exploration Activity Details|
|Location||Lassen Volcanic National Park Area|
|Exploration Technique||Compound and Elemental Analysis|
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). In Table 1,we include many additional analyses of gas discharges from superheated fumaroles in all of the major LVNP solfataras, with analyses of gases from other thermal vents and hot springs in the Lassen area for comparison. Analytical methods are outlined in Goff and Janik (2002, p.305).
- 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