ISOTOPE HYDROLOGY OF THE GROUNDWATERS OF CENTRAL MEXICO.

A. Issar, J. L. Quijano, J. R. Gat, M. Castro

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Abstract

The environmental isotope (**1**8O, D equals **2H) composition of the groundwater of central Mexico divides these into three distinctive groups: groundwaters whose isotope composition fits the contemporary meteoric-water line with d equals 10**0///0//0; these are from shallow aquifers, mainly in volcanic and alluvial rocks; water whose isotope data plot to the right of the meteoric-water line, describing a new meteoric-water line of d equals 5 minus 7**0///0//0; this group is made up of waters from the confined limestone aquifers which are of regional dimensions; groundwaters with marked oxygen excess which emerge in regions of recent/subrecent volcanic activity and are geothermal in nature. The water sources of central Mexico can be fitted to a general hydrogeological model, which is presented.

Original languageEnglish
Pages (from-to)201-224
Number of pages24
JournalJournal of Hydrology
Volume71
Issue number1-2
StatePublished - 1 Jan 1984

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