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Precipitation falls to the earth basically as distilled water, except near population centers where atmospheric pollution contributes solutes and near the ocean which adds sodium and chloride. The waters of springs, however, contain varying amounts of Ca++ , Mg++, Na+, HCO3- and aqueous silica as major constituents, derived from bedrock. How rainwater changes its composition to springwater as it passes through soils and rocks is not well understood. The objectives of our project were to study the initial changes in water chemistry as moisture passed through a "reactive" bedrock and to compare our results with theoretical models (eg. Helgeson 1968, Helgeson et.al. 1969, 1970, Wood and Surdam, 1979).

The Chemistry of Weathering of a Pliocene Volcanic Ash Deposit, National Elk Refuge, Wyoming