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Geochemistry of waters from springs, wells, and snowpack on and adjacent to Medicine Lake volcano, northern California

Geothermal Resources Council Transactions

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Abstract

Chemical analyses of waters from cold springs and wells of the Medicine Lake volcano and surrounding region indicate small chloride anomalies that may be due to water-rock interaction or limited mixing with high-temperature geothermal fluids. The Fall River Springs (FRS) with a combined discharge of approximately 37 m3/s, show a negative correlation between chloride (Cl) and temperature, implying that the Cl is not derived from a high-temperature geothermal fluid. The high discharge from the FRS indicates recharge over a large geographic region. Chemical and isotopic variations in the FRS show that they contain a mixture of three distinct waters. The isotopic composition of recharge on and adjacent to the volcano are estimated from the isotopic composition of snow and precipitation amounts adjusted for evapotranspiration. Enough recharge of the required isotopic composition (-100 parts per thousand ??D) is available from a combination of the Medicine Lake caldera, the Fall River basin and the Long Bell basin to support the slightly warmer components of the FRS (32 m3/s). The cold-dilute part of the FRS (approximately 5 m3/s) may recharge in the Bear Creek basin or at lower elevations in the Fall River basin.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Geochemistry of waters from springs, wells, and snowpack on and adjacent to Medicine Lake volcano, northern California
Series title:
Geothermal Resources Council Transactions
Volume
23
Year Published:
1999
Language:
English
Publisher:
Geothermal Resources Council
Publisher location:
Davis, CA, United States
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geothermal Resources Council Transactions
First page:
319
Last page:
326
Conference Title:
Global Geothermal Resources: Sustainable Energy for the Future
Conference Location:
Reno, NV, USA
Conference Date:
17 October 1999 through 20 October 1999