Abstract:

Groundwater is not only the important water resource for human production, but also affecting coal mining safety in coalmining region. In order to understand the characteristics of isotopes in groundwater, the analysis of T, D, 18O, 87Sr/86Sr, 13Cdic and 18Odic compositions of groundwater samples from loose aquifer, sandstone aquifer and limestone aquifer in Sunan mining area, Anhui Province had been performed; the result were used to discuss the evolutionary age, isotope characteristics and its influencing factors of groundwater samples based on traditional graphic methods; the results showed that the tritium contents in groundwater samples from three aquifers are low, which suggests that the groundwater in Sunan mining area are supplied by submodern water. The D and 18O concentrations are clearly affected by the surrounding rock; the values range from -44.3‰ to -68.5‰ and -8.78‰ to -6.29‰, with the average of -61.15‰ and -8.16‰, respectively. The content of carbonate in surrounding rock determined the relationship between 13CDIC and 18ODIC. The values of 87Sr/86Sr varied from 0.7106 to 0.7123, with an average value of 0.7112, which also could be used to identify the three aquifers, since the value of 87Sr/86Sr is clearly influenced by the waterrock interactions.

Key words: groundwater, isotopes, geochemistry, Sunan mining area