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ORIGIN OF THERMAL FLUIDS AT LASSEN VOLCANIC NATIONAL PARK: EVIDENCE FROM NOBLE AND REACTIVE GAS ABUNDANCES.

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Abstract

Thermal fluid discharges at Lassen are dominated by high-altitude fumaroles and acid-sulfate hot springs in the Park, and lower altitude, neutral, high-chloride hot springs in Mill Valley 7-10 km to the south. The interrelations of these fluids have been studied by noble and reactive gas analyses. Atmospheric noble gas (ANG) contents of superheated fumaroles are similar to those of air-saturated recharge water (ASW) at 5 degree C and 2500-m elevation. Low-elevation, high-chloride, hot-spring waters are highly depleted in ANG, relative to the ASW. The surface temperatures and gas chemistry of the fumaroles and hot springs suggest that steam originating from partial to near-complete vaporization of liquid from a boiling, high-chloride, hot water aquifer is decompressed adiabatically, and more or less mixed with shallow groundwater to form superheated and drowned fumaroles within the Park. Refs.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
ORIGIN OF THERMAL FLUIDS AT LASSEN VOLCANIC NATIONAL PARK: EVIDENCE FROM NOBLE AND REACTIVE GAS ABUNDANCES.
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:
343
Last page:
348
Conference Title:
Geothermal Resources: Energy on Tap! Geothermal Resources Council 1983 Annual Meeting.
Conference Location:
Portland, OR, USA