Hydrogeochemistry of the Qualibou Caldera Geothermal System, St. Lucia, West Indies
- Key words
- Exploration; Geochemical; Geophysical; Geological; Hydrologic; General; West Indies; St Lucia; Qualibou Caldera; Electrical Conductivity; Reservoir; Conceptual; Models; Vapor Dominated; Boron; Chloride; Hot Springs; Thermal Springs; Isotopes; Silica; Deut
- Location
- Qualibou Caldera, St. Lucia
- Conference
- Geothermal Resources Council Transactions
- Year
- 1984
- Session
- Exploration; Geochemical surveys; Vapor dominated reservoirs
- Language
- English
Abstract
Interpretation of hydro geochemical data and supporting geologic and electrical resistivity data have been used to define the basic structure of the Qualibou Caldera geothermal system and propose a model of hydrologic flow. The geothermal system at Sulphur Springs consists of three layers: 1. an upper steam condensate zone; 2. an intermediate vapor zone, which may be restricted to the Sulphur Springs area only; and 3. a lower brine zone. Four lines of evidence suggest that temperatures of the brine layer may exceed 230°C at depths of perhaps 1 km. Outlying thermal springs along the northwest side of the caldera do not indicate derivation from underlying high temperature sources. We suggest that the main reservoir up flows in the Belfond Sulphur Springs area and flows laterally in the subsurface toward the northwest caldera wall.
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