| Title | Geochemical Appraisal of Bakreshwar-Tantloi Hot Springs of West Bengal and Jharkhand, India |
|---|---|
| Authors | D.K. MUKHOPADHYAY and P.B. SAROLKAR |
| Year | 2012 |
| Conference | Stanford Geothermal Workshop |
| Keywords | Bakreshwar, Tantloi, hot springs, helium, India |
| Abstract | Hot springs are reported in Eastern India at Bakreshwar, West Bengal and Tantloi, Jharkhand. These hot springs are located on the eastern continuation of Son-Narmada lineament zone. The hot springs at Bakreshwar show temperature of 35oC to 66.5oC on surface, while the hot springs at Tantloi record temperature of 30oC to 70oC at surface. The discharge of these hot springs varies from 90 lpm to 480 lpm. The thermal water at Bakreshwar is alkaline with low to moderate sodium, HCO3 and SO4 as compared to chloride. Bakreshwar water shows profuse gaseous activity with 0.31 to 1.33% He. The hot springs at Tantloi are more alkaline with low silica, moderate HCO3, and higher Mg content. Tantloi hot springs have 1.29 to 2.77% Helium content. The thermal water from these springs indicate immature nature. The indicated reservoir temperature at Bakreshwar varies from 110 to 124oC by TSiO2, and 130 to 175oC by T Na/K method. Besides, it is observed that in both the hot springs areas show high fluoride content. The Cl- HCO3 – SO4 ternary plot of thermal water from Bakreshwar falls in HCO3 field indicating Na – bicarbonate type water. The Na-K-Mg ternary plot indicates that the thermal water mostly falls in Mg field, indicating immature water and mixing of thermal water and shallow ground water. The thermal water of Bakreshwar and Tantloi hot springs falls on meteoric line in the äD and äO18 plot suggesting deep circulation of meteoric water in the geothermal system. Bakreshwar thermal springs show high emission of helium gas. The present data also suggests that deeper level investigation is necessary to assess actual reservoir potential. |