Applied Geochemistry 16 (2001) pp. 109-122
The purpose of this study was to elucidate the processes controlling the distribution and behavior of the longer-lived Ra isotopes in continuous Paleozoic carbonate aquifers of parts of Missouri, Kansas, and Oklahoma. Activities of (228Ra) and (226Ra) were analyzed in fresh and saline ground waters, brines, and rocks. The fluids have a wide salinity range (200-250,000 mg/l total dissolved solids). The (226Ra) activity ranges from 0.66-7660 dpm/kg and correlates with salinity and other alkaline earth element (Ca, Sr, and Ba) concentrations. The range of (228Ra:226Ra) ratios in the fuids (0.06-1.48) is similar to that in the aquifer rocks (0.21-1.53). The relatively low mean fuid (228Ra:226Ra) ratio (0.30) refects the low Th:U ratio of the predominant carbonate aquifer rock. Radium occurs mostly (r77%) as Ra2+ species in the fluids. Salinity-dependent sorption-desorption processes (with log K values from 100-104, etc.
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