| Abstract |
The deep-seated geothermal systems are being clarified in more detail with progression of exploitation in some geothermal fields such as The Geysers in USA, Larderello and Monte Amiata in Italy, Tongonan and Palinpinon in Philippines, and Kakkonda in Japan. These fields are reviewed with special reference to plutonism based on previous works. These fields are also compared each other from the viewpoint of geographical position, geological horizon, characteristics of shallow and deep reservoirs, cap rock and geothermal fluids and heat source. These study indicates that the Neo-granite plays the role of a potential heat source, and top of Neo-granite can expected as a potential deepseated geothermal reservoir in some of these fields. The granite is used as the same meaning of Quaternary granitic intrusive bodies in this paper. |