| Title | Geology and Hydrothermal Alteration of the Hverahlid HT-System, SW-Iceland |
|---|---|
| Authors | Steinþór Níelsson and Hjalti Franzson |
| Year | 2010 |
| Conference | World Geothermal Congress |
| Keywords | Hengill, Hverahlid, geothermal system, geology, hydrothermal alteration, geothermal model |
| Abstract | The Hverahlid high-temperature system is located in the southern sector of the Hengill central volcano in SW-Iceland. Reykjavik Energy has today drilled three exploration wells into the geothermal reservoir in order to study its potential for electrical production. The 2000-2800 m deep wells that show a high-temperature system of 200°C -320°C below 600 m-1000 m depth. Lava successions dominate the strata with less hyaloclastite formations. Hydrothermal alteration ranges from totally fresh rocks in the overlying cold groundwater system through zeolite assemblage and into high-temperature mineral assemblage including chlorite, epidote, wollastonite and actinolite. |