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The volcanic Ascension Island is located about 100 km west of the median valley of the Mid-Atlantic Ridge. A 3126 m-deep well was drilled on the island to investigate the geothermal system associated with the recent volcanism. Two types of fluid were encountered in the well, both derived from seawater. The first fluid, found at 2500 m depth, was a recent mixture of a gaseous phase rich in volcanic...
Seven coreholes, 63 to 533 m deep, were drilled on Ascension Island to determine the shallow thermal structure in preparation for siting a deep geothermal exploration well. These holes were used to evaluate specific geothermal exploration targets defined by previously completed geological mapping, aeromagnetic and electrical resistivity surveys. The highest temperature measured was 54.4°C at 203...
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