Fluid geochemistry of Hot Springs Bay Valley, Akutan Island, Alaska
Several thermal springs and a fumarole field occur in Hot Springs Bay Valley on Akutan Island. The thermal springs are low in Mg, SiO/sub 2/-rich, and moderately concentrated in Na-Cl, a chemistry typically associated with hot-water hydrothermal systems. B/Cl ratios indicate the several sets of springs are derived from a common parent hot-water reservoir. Application of silica, cation, and sulfate-water oxygen-isotope geothermometry gives a range of 160-190/sup 0/C for the parent reservoir. Recent geophysical investigations performed in cooperation with the Geophysical Institute, U of Alaska, identified a broad zone of apparent low resistivity underlying the lower part of the valley in the vicinity of the thermal springs. Relatively high CH/sub 4/ content and low H/sub 2//CH/sub 4/ ratios occur in gases from both the thermal springs and from the fumarole field located at the head of the valley about 4 km southeast of the hot springs. The similarity in H/sub 2//CH/sub 4/ suggests underlying reservoirs are similar in both areas. Both sites have a ratio of He/He WRT atmospheric levels of about 7.0.
- Research Organization:
- Alaska Division of Geological and Geophysical Surveys
- OSTI ID:
- 5124275
- Journal Information:
- Trans. - Geotherm. Resour. Counc.; (United States), Journal Name: Trans. - Geotherm. Resour. Counc.; (United States) Vol. 6; ISSN TGRCD
- Country of Publication:
- United States
- Language:
- English
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ALASKA
ALKALI METAL COMPOUNDS
ALKALINE EARTH METALS
ALKANES
CHALCOGENIDES
CHEMISTRY
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CHLORINE COMPOUNDS
ELEMENTS
ENERGY SYSTEMS
FEDERAL REGION X
FLUIDS
FUMAROLES
GEOCHEMICAL SURVEYS
GEOCHEMISTRY
GEOTHERMAL FLUIDS
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HALIDES
HALOGEN COMPOUNDS
HOT SPRINGS
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HYDROCARBONS
HYDROGEN
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ISLANDS
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METALS
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OXIDE MINERALS
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SILICA
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THERMAL SPRINGS
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WATER SPRINGS