Fluid Flow through Clayey Soils: Stable Isotope and Mineralogical Evidence

L. S. Doser
1998 Clay minerals  
The evaluation of clays as barriers to fluid movement can be improved by geochemical methods that provide ways to examine the reactivity and weathering of minerals in soils and sediments. X-ray radiography, X-ray powder diffraction, and stable isotope geochemistry provide new data from field locations in the Mississippi River Delta of Louisiana indicating that the clays are not effective barriers to the vertical migration of fluids in the shallow subsurface. Systematic changes in the mineral
more » ... s in the mineral assemblages, the soil structure and the 5D and fi180 values of time clay fractions can best be explained by an alteration sequence produced as the originally smectiterich clay mineral assemblage was kaolinized by percolating groundwater.
doi:10.1180/claymin.1998.033.1.05 fatcat:c6ijrntsqjejvcvotv4wz5cu6u