地下水中蕴藏的海平面变化信息

文章对第四纪海平面变化,特别是近五万年以来海平面变化提供了一些地下水蕴藏的信息。上海第四纪沉积厚度达３６０ｍ以上,根据取自Ⅲ、Ⅳ、Ⅴ含水层的样品测年,上海及其附近地区主要含水层的地下水形成距今约５万年到１．５万年之间,当时海平面曾发生过一次明显相对缓慢的下降过程,在我国东海达到－１５５ｍ,所以可以推断在上海以东广大海域地区,包括舟山群岛地区海域都有大面积的含水层分布,其水文地质条件和上海地区存在连续关系。

THE INFORMATION ABOUT SEA LEVEL CHANGES INFERRED FROM GROUNDWATER

On basis of the thought "past is the key to the future", we try to provide someinformation about sea level changes from the groundwater, especially the progressive sealevel changes in recent 50000 years. The evidence has shown that the depth of Quaternarydeep groundwater was over 200 m in Yangtze Delta or in eastern plain of China. Thegroundwater recharge was formed during the gradually descending of sea level from 15000to 50000 years, and then the swiftly ascending of the sea level preserved the groundwaterfrom large scale destruction.