exhibit a rare spectrum of geochemical conditions. Here the field geochemistry over three
seasons (pH, salinity, and temperature), as well as major ions, trace elements, and H, O, and
S stable isotopes of surface waters and shallow groundwaters from 59 ephemeral lakes in
southern Western Australia (WA) are reported. Approximately 40% of the lakes and 84% of
the measured groundwaters in WA are extremely acidic (pH< 4) and pHs are observed as …