Fig. 5

Photomicrographs (optical microscope and cathodoluminescence) of the Calcaire Récifaux and Calcaires de Landaize units. a, b Grainstone facies, as observed in the Reculet Nord section, showing replacement dolomite affected by calcitization with calcitized cores appearing orange and dolomite rims appearing red under CL (sample YM63). c, d grainstone facies in the Valefin section showing isopachous cement rim (IC) of allochems. The residual space is filled by blocky calcite (BC) cementation (sample YM2). e, f the same facies in the Roche Blanche section showing isopachous cementation and large syntaxial overgrowth around an echinoderm bioclast (sample YM6). g, h Calcaires de Landaize oolitic to oncoidic grainstone exhibiting important pressure-dissolution contact due to compaction. Under CL, the interparticular pore space is filled by blocky calcite cementation cross-cut by rhomboedral moldic pores due to dedolomitization (sample YM5)