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What is the salinity range of hydrothermal fluids?

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I agree with the other answers regarding salinity ranges and their definition. I will add that salinity is a poor indicator for the source of a hydrothermal fluid. A hydrothermal fluid could be formed from a number of different mechanisms, each of which could generate a range of salinities. read more

Hydrothermal fluids which are used for geothermal electrical power production range from nearly pure H2O (as steam) to nearly 30 wt% (e.g. Salton Sea geothermal system) Salinity does not necessarily serve as a good indicator of fluid source. read more

The maximum salinity predicted by our models is also close to the maximum salinity of fluids trapped in the dike section (i.e., 13 wt.% NaCl ) but exceeds the maximum salinity of fluids observed in modern vents. read more

Jairath and Sharma inferred a CO 2-bearing hydrothermal fluid, with temperatures ranging from 210 to 470 °C and containing appreciable amount of Na and K. Boiling at 370 °C likely caused precipitation of the ore, with a later separation between a CO 2-rich fluid of low salinity and a more saline fluid having low CO 2 (Jairath and Sharma 1986). read more

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