Hydrochemistry and origin of CO2 gas and noble gas of carbonated mineral water in the Gyeongbuk-Gangwon Province, South Korea
Abstract
Hydrochemical, carbon isotopic (δ13CDIC) analyses of 11 samples, and noble gas isotopic analyses of 8 samples collected in the Gangwon and the Gyeongbuk area of South Korea were carried out to elucidate hydrochemical characteristics and to interpret the source of noble gases and CO2 gas. The carbonated mineral waters show a weak acidic pH between 5.59 and 6.04. An electrical conductivity of carbonated mineral waters ranges from 302 to 864 μS/cm. The chemical composition of all carbonated mineral waters can be grouped into only one type such as Ca-HCO3. A high content of Fe and Mn in carbonated mineral waters exceeds a regulation limit of drinking water. The δ13CDIC values of carbonated mineral waters show the range of -5.30°15 -2.84 ‰. This range indicates that the carbon of carbonated mineral waters is mainly supplied from a deep-seated source and partly from an inorganic carbonate source. The 3He/4He ratios of the carbonated mineral waters show the range of 1.51×10-6 to 6.45×10-6. The carbonated mineral waters on the 3He/4He and 4He/20Ne diagram are plotted into three groups: deep seated area such as mantle source, atmospheric area, and air-mantle mixing area. A wide range of 4He/20Ne ratios is observed (0.036×10-6 to 1.76×10-6), showing evidence that while radiogenic 4He is dominant in these water samples, He of mantle-origin is also supplied to these waters. It is estimated that supply of CO2 gas and noble gas of a deep-seated source into carbonated waters is closely related to geologic structures such as fault and geologic boundary. Key words: carbonated mineral waters, hydrochemical composition, carbon isotope, 3He/4He, deep-seated origin
- Publication:
-
EGU General Assembly Conference Abstracts
- Pub Date:
- April 2012
- Bibcode:
- 2012EGUGA..14.1416J