Organic Carbon Input in Shallow Groundwater at ÄSPÖ, Southeastern Swedenby B. Wallin, Stockholm Univ, Stockholm, Sweden,
Abstract: The variation in carbon and oxygen isotopes in calcite fissure fillings and dissolved carbonate from shallow groundwaters has been examined at Aspo, southeastern Sweden. The shallow water lens is refilled by meteoric water and is considered as an open system. The δ13C-signatures of the dissolved carbonate fall within a narrow range of -15.8 -17.4 per mil, indicative of organic an organic carbon source. The low δ13 C-values suggest that input of soil-CO2 is the dominating carbon source for the system. δ13C and δ18O-values in the calcite fissure fillings show a wide range in values with a possible two end-member mixing of early post glacial atmospheric CO2 dominated system to a present day soil-CO2dominating carbon source.
Subject Headings: Groundwater | Carbon compounds | Light rail transit | Carbon fibers | Isotopes | Carbonation | Cracking | Dissolved solids | Soil gas | Oxygen | Europe | Sweden | North America | Colorado | United States
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