수리지질학/지구화학/지구물리학․10월 28일(금)
2005 대한지질학회 추계학술발표회 초록집
43Variation of δ
13
CDIC
of Waters in the Sandstone andthe Carbonate-rock Terrains in the Pyeongchang and Jeongseon Area, Gangweon Province, Korea
Woo Jin Shin*․ Gong Soo Chung Department of Geology and Earth Environmental Sciences
Chungnam National University, Daejeon 305-764, Korea [email protected]
δ13CDIC and geochemical parameters including water temperature, pH, Eh, EC, DO and TDS of soil, surface and stream waters in the sandstone terrain, and spring and stream waters in the carbonate-rock terrain were measured to understand factors controlling δ
13CDIC of the waters which were sampled on a biweekly basis for about one year in the Pyeongchang and Jeongseon area, Gangweon Province, Korea.
In the sandstone terrain, soil water shows an average δ13CDIC of -16.7‰ and a season- al variation pattern of high δ13CDIC of winter compared to that of summer. The soil water shows negative correlations of δ13CDIC with water temperature, Eh and DIC, and rela- tively low pH value. The δ13CDIC variation of the soil water is thought to be resulted from soil CO2 derived by decay of organic matter during the summer. The surface water in the sandstone terrain shows an average δ13CDIC of -4.2‰ and a seasonal variation pattern characterized by higher δ13CDIC during the winter than during the summer. It also shows negative correlations with water temperature and Eh, and relatively low DIC. The δ13CDIC
valueofthe surface water is interpreted to be resulted from CO2 exchange between at- mosphere and water, and subsequent enrichment of δ13CDIC in hydrated CO2. The stream water in the sandstone terrain shows an average δ13CDIC of -7.0‰ and negative correla- tions with water temperature and Eh. It also shows a seasonal variation pattern of low δ
13CDIC valueduring the summer and high value during the winter, and no correlations with EC and pH, and low DIC value. This pattern of δ13CDIC suggests that δ13CDIC of the stream water was influenced both by soil derived CO2 and CO2 exchange between atmosphere and water.
In the carbonate-rock terrain, spring water shows an average δ13CDIC value of -9.8‰
and negative correlation with water temperature and Eh, positive correlation with EC and DIC, and relatively high δ13CDIC. The δ13CDIC value in the spring water is thought to have been largely influenced both by dissolution of carbonate rock and soil CO2. The stream water in the carbonate-rock terrain shows an average δ13CDIC of -7.7‰ and negative correlations with water temperature and Eh, positive correlations with EC and DIC. The δ13CDIC value of the stream water in the carbonate-rock terrain is interpreted to be re- sulted from dissolution of carbonate rocks, soil CO2 and exchange of CO2 between atmos- phere and water.
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