Carbonate and plagioclase weathering rates in Pleistocene glacial drift deposits: Solute fluxes from soils to shallow groundwater systems

,Thick Pleistocene glacial drift deposits mantle large portions of the upper Midwestern U.S.A.. In lower Michigan, high permeability of soils and underlying glacial drift produce unusually close chemical linkages among soil, ground and surface waters. This region also provides an ideal natural laboratory with abundant organic matter and freshly eroded, reactive minerals in which to determine sequence and mass balances of carbonate and silicate mineral weathering and the