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Cl Introduction 1 Acknowledgments 2 Sample collection and analysis 2 Selection and preparation of wells 2 Field parameters 2 Major and minor elements 3 Dissolved gases 3 Stable and radioactive isotopes 4 Mineralogic analysis 5 Judith Basin study area 5 Physiography 5 Topography 5 Drainage 6 Climate 6 Geology 6 Structure 6 Stratigraphy 8 Mineralogy of the Kootenai Formation 8 Hydrology 10 Data presentation and interpretation 12 Major and minor elements 12 Dissolved gases 23 Isotopic composition 24 Geochemical computer modeling 27 Saturation indices 27 Reaction simulation 31 Carbon isotopic evolution 35 Powder River Basin study area 37 37 37 37 38 39 39 40 40 Physiography Topography ____ _ ___ Drainage Climate Geology Structure Stratigraphy Mineralogy of the Lance-Fox Hills aquifer Powder River Basin study area Continued Hydrology Data presentation and interpretation Major and minor elements Dissolved gases Isotopic composition Geochemical computer modeling Saturation indices Reaction simulation Carbon isotopic evolution Conclusions References cited Supplemental data Geochemical principles Solution-mineral equilibria Law of mass action Equilibrium constants Activities and activity coefficients Complex equilibria Saturation indices Phase diagrams Aqueous solubility of gases Oxidation-reduction Mineral dissolution and weathering Ion exchange Environmental isotopes Stable isotopes Oxygen and hydrogen Carbon Sulfur Radioactive isotopes Tritium Carbon-14 Geochemical computer models WATEQ2 PHREEQE Isotopic evolution equations Page C42 43 43 54 58 59 59 62 65 66 69 73 74 74 74 74 74 75 75 76 76 77 78 79 80 80 80 80 81 82 82 82 83 83 83 84

u.s. geological survey professional papers/u.s. geological survey professional paper

Geochemistry of ground-water in two sandstone aquifer systems in the Northern Great Plains in parts of Montana and Wyoming, North Dakota, and South Dakota