Econ. Environ. Geol. 2001; 34(2): 227-241

Published online April 30, 2001

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Occurrence, Geochemistry and Origin of CO2-rich Water from the Chungcheong Area, Korea

Chan Ho Jeong1*, Jong Gun Kim2 and Jae Young Lee3

1Department of Geosystem Engineering, Taejon University, Taejon, 300-716, Korea
2Department of Environmental Management, Taegu Polytechnic College, Taegu 706-711, Korea
3Department of Geology, Kyungpook National University, Taegu, 702-701, Korea

Correspondence to :

Chan Ho Jeong

chjeong@dragon.taejon.ac.kr

Received: February 21, 2001; Accepted: March 30, 2001

Abstract

Several CO2-rich springs in the Chungcheong area, i.e., the Angsung spring, the Chojung spring, the Myungam spring, the Bukang spring and the Daepyung spring have been long known for their particular water chemistry. The occurrences of these springs are closely related to the geologic structure of Mesozoic granite such as dyke swarms, fault zones and the geologic boundary between granite and its adjacent gneiss. The CO2-rich water samples show a high CO2 concentration (PCO2 0.25 atm to 0.99 atm), weak acidic pHs and the electrical conductivity ranging from 101 to 2,950 mS/cm. The CO2-rich water samples are classified into the Ca-HCO3 type and the Ca(Na)-HCO3 type in chemical composition. Environmental isotopic data (2H/1H, 18O/16O) indicated that CO2-rich water was meteoric
origin. The δ13C values of CO2-rich water range from -3.1‰ to -6.8‰ PDB. The values indicate that H2CO30 and HCO3- of the water samples are mainly originated from a deep-seated source and partly contributed from carbonate minerals. The major minerals determining the chemistry of CO2-rich water are probably the carbonate minerals which are present as veins and secondary minerals, and the plagiocalse in granite and gneiss.

Keywords CO2-rich springs, geologic structure, chemical composition, δ13C, deep seated source

Article

Econ. Environ. Geol. 2001; 34(2): 227-241

Published online April 30, 2001

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Occurrence, Geochemistry and Origin of CO2-rich Water from the Chungcheong Area, Korea

Chan Ho Jeong1*, Jong Gun Kim2 and Jae Young Lee3

1Department of Geosystem Engineering, Taejon University, Taejon, 300-716, Korea
2Department of Environmental Management, Taegu Polytechnic College, Taegu 706-711, Korea
3Department of Geology, Kyungpook National University, Taegu, 702-701, Korea

Correspondence to:

Chan Ho Jeong

chjeong@dragon.taejon.ac.kr

Received: February 21, 2001; Accepted: March 30, 2001

Abstract

Several CO2-rich springs in the Chungcheong area, i.e., the Angsung spring, the Chojung spring, the Myungam spring, the Bukang spring and the Daepyung spring have been long known for their particular water chemistry. The occurrences of these springs are closely related to the geologic structure of Mesozoic granite such as dyke swarms, fault zones and the geologic boundary between granite and its adjacent gneiss. The CO2-rich water samples show a high CO2 concentration (PCO2 0.25 atm to 0.99 atm), weak acidic pHs and the electrical conductivity ranging from 101 to 2,950 mS/cm. The CO2-rich water samples are classified into the Ca-HCO3 type and the Ca(Na)-HCO3 type in chemical composition. Environmental isotopic data (2H/1H, 18O/16O) indicated that CO2-rich water was meteoric
origin. The δ13C values of CO2-rich water range from -3.1‰ to -6.8‰ PDB. The values indicate that H2CO30 and HCO3- of the water samples are mainly originated from a deep-seated source and partly contributed from carbonate minerals. The major minerals determining the chemistry of CO2-rich water are probably the carbonate minerals which are present as veins and secondary minerals, and the plagiocalse in granite and gneiss.

Keywords CO2-rich springs, geologic structure, chemical composition, δ13C, deep seated source

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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