Hydrogeochemistry of Damt thermal springs,Yemen Republic |
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| Affiliation: | 1. U.S. Geological Survey, Texas Water Science Center, 1505 Ferguson Lane, Austin, TX 78754, United States;2. U.S. Geological Survey, Office of Groundwater, 12201 Sunrise Valley Dr., Reston, VA 20192, United States;3. School of Geosciences, University of South Florida, 4202 East Fowler Ave., Tampa, FL 33620, United States;4. Institute of Geological Sciences, National Academy of Science of Armenia, 24 Marshall Baghramian Avenue, 0019 Yerevan, Armenia |
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| Abstract: | The Damt thermal springs (40–45°C) flowing through travertine deposits belong to the Na–HCO3 type of water and have higher pCO2 ( from −118 to −058=PCO2 from 007 to 026 atm) relative to cold Ca–SO4− (Cl) groundwaters The cold waters have pCO2 ranging from −186 to −250 (=PCO2 from 0014 to 00035 atm) The chemical composition of the cold springs is controlled by evaporite deposits present in the Tawilah sandstone and Amran limestone formations while simple crustal dissolution coupled with CO2-rich fluid–rock interaction control the chemical signature of the hot spring waters. The temperature of the feeding system based on the K 2/Mg geothermometer varies between 80 and 120°C Damt thermal springs appear to be related to a 10 000 year-old volcanic activity that led to the appearance of several craters in the area. |
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