Isotopic Stratification and Its Implications in Groundwater of Northern China

摘要

The contents of D,. ~8O, ~3H and ~14C, distinctive in shallow and deep Quaternary aquifers beneath northern China, reflect differences in average paleoclimatic conditions between the Holocene and the last glacial period in Pleistocene. Groundwater in deep confined aquifer was recharged during the last glacial period. The depletions of δ(D) and δ(~18O) of this water, 4×10~-3-16×10~-3 and 1×10~-3 - 2 × 10~-3 when compared with the shallow water recharged in Holocene, suggest that the annual mean temperature was lower in the last glacial period than that in the Holocene.