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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2002
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| Online Access: | https://www.redalyc.org/articulo.oa?id=56841421 |
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Table of Contents:
- The isotopic and chemical compositions of the CO2-rich waters in Korea Yongkwon Koh Chunsoo Kim Daeseok Bae Kyeongwon Han Ciencias de la Tierra CO2 water mixing isotope chemistry The chemical and isotopic compositions of CO2-rich water (Pco2 ≈ 1 atm) in Korea mainly occurring in granitic terrain wereinvestigated. CO2-rich waters can be divided into three types based on chemical compositions: Na-HCO3, Ca-Na-HCO3 and Ca-HCO3 types. Water chemistry indicates that these waters were evolved through a strong reaction of the host rocks with a supply ofdeep-seated CO2 during deep circulation. The dissolution process of plagioclase is important in water/granite interactions and itssolubility changes with reaction temperature played an important role in the determination of chemical composition. Multi-componentmineral/water equilibrium calculations indicate that the CO2-rich water reaches temperature of 115-140°C.δ18O and δD data indicate that CO2-rich waters were derived from local meteoric water and have a lighter isotope compositionthan other natural waters. The tritium contents show a long residence time and the possibility of CO2 flux in an aquifer at greatdepth. There is a strong indication of mixing between deep CO2-rich water and recent fresh water during ascent to the surface.Carbon isotope analysis reveals that the carbon composition is associated with mantle-derived CO2. The preliminary heliumisotope ratio also supports that the CO2 gas was derived from mantle origin. The strontium isotope ratios indicate that the chemistryof the CO2-rich water is determined by reaction with local granite. 2002 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56841421 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.4 Vol.41