INDIA

摘要

In a recent publication, Minissale et al. (2000) reported helium concentrations in the thermal gases from West Coast and Tattapani geothermal provinces (Fig. 8). The most remarkable finding is the high ~4He concentrations in these gases, which range from 0.5 to 6.9%. Deep and prolonged circulation of the thermal waters and the presence of anomalous geothermal gradients have been recorded in the above provinces (Chandrasekbaram, 2000). Such high ~4He is apparently due to the presence of a large reservoir of He in the Precambrian rocks lying below the Deccan trap cover.