Geochemical Investigations at Edgemont, South Dakota
- Key words
- Exploration; USA; South Dakota; Edgemont; Geochemical Surveys; Chemical Analysis; Geothermometry
- Location
- Edgemont, South Dakota
- Conference
- Geothermal Resources Council Transactions
- Year
- 1980
- Session
- Geochemical surveys; Temperature gradients; Geothermometers
- Language
- English
Abstract
Average temperature depth gradients in wells penetrating the Mississippian Madison Limestone in Edgemont, South Dakota, are 4.7°C/100 m, whereas the average gradient in the Black Hills area is 2.6°C/100 m. Chemical analyses of ground water from forty one Madison wells and springs were obtained to define the geochemical characteristics of the low temperature geothermal system. The results of these analyses show that ground water from wells with high temperature depth gradients is a sodium chloride calcium sulfate type, and has concentrations of silica, lithium and cobalt which are significantly higher than those which are found in all other waters sampled.
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