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TY - JOUR AU - Abdallah, Edista A. AU - Kasanzu, Charles H. AU - Kinabo, Crispin P. AU - Imai , Akira AU - Butler, Mike J. PY - 2022/12/30 Y2 - 2025/07/31 TI - Constraining the Origin and Age of the Thermal and Cold Water in the Lake Natron Basin, Northern Tanzania JF - Tanzania Journal of Science JA - Tanz. J. Sci. VL - 48 IS - 4 SE - Articles DO - 10.4314/tjs.v48i4.8 UR - https://tjs.udsm.ac.tz/index.php/tjs/article/view/1501 SP - 804-815 AB - <p>Springs on the eastern and western shores of Lake Natron Basin (LNB), located within the eastern branch of the East Africa Rift System (EARS) in Northern Tanzania had a discharge temperature that ranged between 34.0 °C and 51.2 °C, while the pH varied from 8.0 to 10.7. The electrical conductivity (EC) ranged between 5,007 µS/cm and 49,200 µS/cm. Cold waters had a temperature of 31.9 °C to 32.5 °C, while the pH ranged between 8.0 and 8.3, and the EC ranged between 1,401 µS/cm and 3,806 µS/cm. The stable isotope composition varied between -2.4 ‰ and -5.3 ‰ for δ¹⁸O, and -15.5 ‰ to -29.3 ‰ for δ²H. The isotopic composition of thermal and cold water of LNB indicates a significant contribution of meteoric water in the recharge of the hydrothermal system. However, thermal water is affected by evaporation, water-rock interaction, carbon dioxide (CO₂) exchange and condensation processes. Tritium analysis indicated that the spring water in the LNB hydrothermal system has a residence time of more than 50 years.</p> ER -