Fig. 4

S.E.M. images of samples affected by early dolomitization and dedolomitization. Calcite appears in light grey while dolomite appears in dark grey. a Blocky Calcite (BC) and T1 dedolomite (T1-D, dark grey). The dedolomite includes vuggy pores resulting from dissolution and replacement by calcite (light grey); b calcitization and intercystalline microporosity in a T1 dedolomite; c replacive T1 dolomite and EDS analysis of the dolomite and micrite; d Sucrosic dedolomite (T2-D) showing important, large, intracrystalline vuggy pores but little amount of calcite replacement; e calcitization and intercrystalline microporosity in a T2 dedolomite, including intercrystalline porosity