A: A possible five-step fluid and tectonic evolution of the Aquitaine basin in the Jard-sur-Mer Area during the Jurassic (see text for explanations). B: Salinity and temperature evolution of fluids during stages 3 to 5 (modified after Cathelineau et al., 2012). 1: anhedral quartz from Hettangian unit, 2: geodic quartz from Hettangian unit, 3: quartz within fault planes of the Bathonian unit, 4: geodic quartz following barite from the Hettangian unit.