Granite groundwater composition

Groundwater composition in granitic bedrock at great depth and the artificial standard waters used... 

Radionuclide transport in natural waters is strongly dependent on sorption, desorption, dissolution, and precipitation processes. The first two sections discuss laboratory investigations of these processes. Descriptions of sorption and desorption behavior of important radionuclides under a wide range of environmental conditions are presented in the first section. Among the sorbents studied are basalt interbed solids, granites, clays, sediments, hydrous oxides, and pure minerals. Effects of redox conditions, groundwater composition and pH on sorption reactions are described. 

Standard granite groundwater (GGW), with a composition based on reported analyses of naturally occurring groundwaters associated with granitic formations (7). 

Groundwater Composition and Saline Fluids in the Lac du Bonnet Granite Batholith, Manitoba,... 

The first point of discussion is the influence of the bedrock nature on the chemical composition of waters. We can see in Table II and in Fig. 6 that waters in the chloritic schist or argillaceous sand areas do not differ from those in the granitic area. This is not surprizing, in spite of the well-known control of rock mineral on the groundwater composition (M. Schoeller, 1962 Tardy, 1969) in fact, in the whole bioclimatic sequence considered, the lateritization processes have destructed all the primary minerals, except quartz, and the weathering minerals are always the same kaolinite, iron oxide and oxy-hydroxide, the stabilities of which in the surface are very great. 

IWATSUKI, T. Yoshida, H. 1999. Ground-water chemistry and fracture mineralogy in the basement granitic rock in the Tono uranium mine area, Gifu Prefecture, Japan - Groundwater composition. Eh evolution analysis by fracture filling minerals. Geochemical Journal, 33, 19-32. 

Rennerfelt, J., "Composition of Groundwater at Great Depth in Granitic Bedrock", KBS TR 36, 1977... 

All ground/soil/rock materials sorb ions,but the sorption distribution value (defined by k, eqn. (22.10)) depends on so many factors that they may be considered site specific, i.e. dependent on the ion released, the near Held matrix composition (buffer material, dissolved canister, etc), the ground water con sition and the rock mineral composition. However, clay and granite have about the same values in similar groundwaters. 

The stable isotopic compositions of these waters (5D SMOW and 5 0 SMOW) indicates that all the groundwaters are meteoric in origin (Fig. 7). Water sampled from the granite at DH-4/80 m contained detectable tritium (4.6 TU). 

The isotopic composition of the groundwater in the granitic rock plots near to the composition... 

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