Conclusions
Hydrochemical characteristics of the water samples from the
travertine-depositing vents and non-travetine-depositing vents in the
Heinitang hot spring indicate that the precipitation of travertine
deposits from the hot water is mainly affected by the concentration of
CaCO30 and concentrations of
CO2, PCO2 and the conditions of
CO2-outgassing, and the effect
of\(\text{\ \ }\mathrm{\gamma}\)Mg/\(\mathrm{\gamma}\)Ca and\(\mathrm{\gamma}\)Ca/\(\mathrm{\gamma}\)HCO3 on the
precipitation of travertine is not obvious. The deposition of travertine
is significantly affected by CaCO30.
With the deposition of travertine, the concentration of
CaCO30 in hot springs decrease. When
the concentration of CaCO30 is higher
than 0.018 mmol/L, the travertine consists of dolomite, calcite and
aragonite, and the concentration of dolomite is higher than those of
calcite and aragonite. When the CaCO30concentration is between 0.008 and 0.018 mmol/L, calcite is the main
component of travertine. When the concentration of
CaCO30 is lower than 0.008 mmol/L, the
precipitation of travertine will hardly occur near the hot spring.