中国北方平原盆地地下水氢氧同位素组成特征

在系统收集整理中国北方河北平原、太原盆地、鄂尔多斯盆地以及银川平原的地下水氢氧同位素资料基础上,依据同位素形成演化相似性原理,对比分析同位素组成得出:深层地下水是在过去更寒冷的气候条件下形成;研究区的大气降水不但在现代气候条件下存在大陆效应和高程效应,而且在 25 kaB.P.以来的古气候条件下也存在大陆效应和高程效应;古气候条件下各盆地平原之间的蒸发强度的差异可能比现代气候条件下各盆地平原之间的蒸发强度的差异大.

Composing Characteristic of Groundwater Hydrogen and Oxygen Isotopes in Northern China Plains and Basins

Based on systematic data collection and preparation of hydrogen and oxygen isotopes from precipitation and groundwater in northern China basins and plains,including Hebei plain,Taiyuan basin,Eerduosi basin and Yinchuan plain,according to similarity principle of isotope forming and evolvement,isotope compositions were compared and analyzed.Major findings are: the deep ground water was formed under the condition of colder climate in the past;the atmospheric precipitation of the study area has the continental and altitude effects under the modern climate and palaeoclimate since 25kaB.P.;the difference in evaporation capacity between the basins and plains under the palaeoclimate may be larger than it is under the modern climate.