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@article{Abdallah_Kasanzu_Kinabo_Imai_Butler_2022, title={Constraining the Origin and Age of the Thermal and Cold Water in the Lake Natron Basin, Northern Tanzania}, volume={48}, url={https://tjs.udsm.ac.tz/index.php/tjs/article/view/1501}, DOI={10.4314/tjs.v48i4.8}, abstractNote={<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 δ<sup>18</sup>O, and -15.5 ‰ to -29.3 ‰ for δ<sup>2</sup>H. 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 (CO<sub>2</sub>) 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>}, number={4}, journal={Tanzania Journal of Science}, author={Abdallah, Edista A. and Kasanzu, Charles H. and Kinabo, Crispin P. and Imai , Akira and Butler, Mike J.}, year={2022}, month={Dec.}, pages={804–815} }