STABLE ISOTOPE GEOCHEMISTRY OF THERMAL FLUIDS FROM LASSEN VOLCANIC NATIONAL PARK, CALIFORNIA.
By: Cathy J. Janik, Nancy L. Nehring, and Alfred H. Truesdell
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Abstract
In the Lassen vapor-dominated geothermal system, surface manifestations of thermal fluids at high elevations (1800-2500 m) include superheated and drowned fumaroles, steam-heated acid-sulfate hot springs, and low-chloride bicarbonate springs. Neutral high-chloride hot water discharges at lower elevations. Deuterium and oxygen-18 data establish genetic connections between these fluids and with local meteoric waters. Steam from the highest temperature fumarole at Bumpass Hell and water from the highest chloride hot spring have isotopic compositions corresponding to vapor-liquid equilibrium at 235 degree C. Carbon and sulfur isotope data suggest that the CO//2 and H//2S in the system did not entirely originate from magmatic sources, but probably include contributions from thermal metamorphism of marine sedimentary rocks. Observations suggest that carbon and sulfur isotope variations are useful indicators of gas reactions and flow paths in geothermal systems. Refs.
Suggested Citation
Janik, C.J., Nehring, N., Truesdell, A.H., 1983, STABLE ISOTOPE GEOCHEMISTRY OF THERMAL FLUIDS FROM LASSEN VOLCANIC NATIONAL PARK, CALIFORNIA., in Transactions - Geothermal Resources Council, v. 7, Portland, OR, USA, p. 295-300.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | STABLE ISOTOPE GEOCHEMISTRY OF THERMAL FLUIDS FROM LASSEN VOLCANIC NATIONAL PARK, CALIFORNIA. |
| ISBN | 093441257X |
| Volume | 7 |
| Year Published | 1983 |
| Language | English |
| Publisher | Geothermal Resources Council |
| Publisher location | Davis, CA, USA |
| Larger Work Title | Transactions - Geothermal Resources Council |
| First page | 295 |
| Last page | 300 |
| Conference Title | Geothermal Resources: Energy on Tap! Geothermal Resources Council 1983 Annual Meeting. |
| Conference Location | Portland, OR, USA |