A Deep Alteration and Oxidation Profile in a Shallow Clay Aquitard: Example of the Tégulines Clay, East Paris Basin, France

Figure 11

Chemical characterization of pore waters and weathering profile. (a) Chloride and sulfate concentrations of pore waters as a function of depth based on anion leaching data and directly measured on pore waters extracted by squeezing (all boreholes). (b) Profiles of alkalinity, pH cation (squeezing), and anion concentrations (squeezing and leaching data) in pore waters as a function of depth. (c) Profiles of δ¹⁸O and δD of pore waters, contents, and ⁸⁷Sr/⁸⁶Sr of exchangeable strontium through the Tégulines Clay (AUB1010 borehole only). Blue points and lines correspond to meteoric waters and green points to Greensand aquifer.