Abstract
1,K 1 , and Cl 2 , all of which are high in the hydrothermal waters. Cation concentrations decrease along the Lesser Himalayan reach of the river. Hot-spring dissolved CO2 has a d 13 C value to 15.9‰, indicating that metamorphic decarbonation reactions contribute CO2 to the fluids. Hydrothermal CO2 is partially neutralized in high-temperature weathering reactions, which generate alkalinity and yield abundant radiogenic Sr. Radiogenic hydrothermal carbonate can form from these solutions and later weather, releasing silicate Sr but imparting carbonate characteristics to the overall water chemistry.
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