Fig. 7

Sample S8: (a) Cross-polarized light image of the fracture infill in thin section (performed with ZEISS Axioscope 5 POL); (b) SEM image showing the fracture infill and surrounding matrix; (c) Location of EDS spot analyses; (d) SEM close-up of the fracture infill; (e) XRD pattern of the powdered fracture infill with main peaks indexed for calcite, quartz, and biotite.