ABSTRACT
There is a long list of groundwater properties and a very large number of different groundwater types: shallow and deep; recent and old; flowing and static; fresh and saline; of different ionic ratios; of negative (light) δD and δ18O values, depicting the meteoric origin, and of heavy evaporative signatures; cold and warm; and so on. All these are continental groundwaters, and in the previous chapter we observed that despite the high variability, there are some common threads: All the water sources that are part of the ongoing flow of the active water cycle are sea tagged and have a meteoric isotopic imprint. Along these lines, let us ask ourselves what kind of groundwaters do we expect to find beneath the oceans?
