Geochemical Appraisal of Hot Springs of North Eastern Region, India
Prafulla B. SAROLKAR
[Geological Survey of India, India]
The Himalayan range is storehouse of signature of various geological activities manifested in form of structural features and hot springs. The geothermal activity is manifested in form of hot springs along the Himalayan ranges. The hot springs are reported at Garam pani (45°C), Assam; Jakrem (47°C) in Meghalaya; Chhetu (35°C to 65°C) in Arunachal Pradesh and Sechu (42°) in Sikkim. Reservoir temperature of 150°C is estimated for hot springs in Sechu area. Reservoir temperature around 100°C is estimated for the hot springs in Assam and Meghalaya. Most of these hot springs are located along the lineaments indicating deep circulation of water. Besides these, hot springs are also located at Dirang, Thimbu and Gange Khor. The hot spring at Jakrem contains 80 ppm Cl, 13.5 ppm SO4, 98 ppm HCO3, 70 ppm NA, 8 ppm Ca, 1 ppm K, The Chhetu hot spring contains 332 to 444ppm HCO3, 105 to 170 ppm Cl, 334 to 368 ppm SO4, 135 PPM, Ca, 151 to 242 ppm sodium, 11 to 180 ppm potassium, and 24 to 85 ppm silica. Silica geothermometer indicates reservoir temperature of around 125°C at Chhetu. Hot spring at Sechu contains 220 ppm HCO3, 87 ppm, 922 ppm SO4, 192 ppm Ca,256 ppm Na, 35 ppm K and 129 ppm Si. The indicated reservoir temperature is 145°C. These hot springs indicate mostly immature water with mixing at shallow level. Considering this, there is need to take up detailed study of hot springs in North Eastern Region of India. The geothermal resources in North Eastern Region, which are moistly low enthalpy resources , can be used for binary cycle power plant for electricity generation and direct heat uses like green house cultivation, refrigeration, cement curing, fish drying, processing of forest products and tourism, in Assam, Arunachal Pradesh and Meghalaya states to improve the economic activity of the region.
|        Topic: Geochemistry||Paper Number: 14115|