a. Detailed geological map of the Alet-les-Bains graben (Western Mouthoumet Massif front) modified after Bessière et al. (1977a) with microtectonics analysis locations and hydrothermal springs. b. Interpreted Westward panorama of the Alet graben from the outcrop AB5. c. Outcrop AB7: karst cavities on the Devonian series NE-SW aligned. d. Outcrop Fa: sinistral strike-slip motion on the Fa fault. e. Outcrop Pu (location in Fig. 2b): Karstic corridor into the strike-slip Puivert fault affecting the Thanetian limestones (post- ca., 55 Ma). f. Outcrop AB7 picture of coarse calcite crystals of rhombohedral lamellar texture. Lamellar calcite is frequently described in epithermal systems and its texture is related to hot fluid overpressure (Simmons and Christenson, 1994; André-Mayer et al., 2002; Chauvet et al., 2006).