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- W1986723689 abstract "Abstract Sixteen thermal springs of South Africa were studied. Chemically, two salinity groups were found; one group at 3–13 meq l−1 TDI issuing in crystalline terrains, and a more saline group, 30–80 meq l−1 TDI, mostly associated with sedimentary rocks. Stable hydrogen and oxygen isotopic compositions indicate direct recharge by heavy rains and negligible intermixing with water from adjacent rivers. Tritium concentrations are generally low. In a few cases, tritium at the limit of detection, combined with sub-recent 14C, might indicate some admixture of recent water. Dissolved Ne, Ar, Kr and Xe occur at atmospheric isotopic composition and at concentrations indicating intake temperatures of 15–35°C. These intake temperatures show a clear dependence of climatic and geographical factors. Some of the springs contain significant amounts of radiogenic helium, accompanied by radiogenic argon. The ( 4 He 40 Ar ) radiogenic values are in the range of 1–7, indicating common rocks as the origin rather than concentrates (ores) of U and Th. Low helium values in some of the thermal springs are explained by large flows and short residence times." @default.
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- W1986723689 date "1984-04-01" @default.
- W1986723689 modified "2023-09-27" @default.
- W1986723689 title "Dissolved ions, stable and radioactive isotopes and noble gases in thermal waters of South Africa — A comment" @default.
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- W1986723689 doi "https://doi.org/10.1016/0022-1694(84)90192-6" @default.
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