Diagenetic signature of the Mid-Paleocene exposure surface in the southeastern Pyrenean platform

From Danian to Thanetian, the South-Pyrenean carbonate platform underwent the most important Paleocene marine level fall of approximately 60 m magnitude. The palaeoenvironmental setting related to the highstand systems tract was defined thanks to detailed petrographical descriptions of the sedimentary facies. These conditions are based on a “hypersaline lagoon and prograding subtidal sabhka” model. The descriptions of diagenetical processes show that the lowstand period is underlined by the following six major diagenetic stages: early processes related to depositional environment, meteoric karstification, meteoric cementation, mixed corrosion and precipitation, and burial. We propose this sequence such as the diagenetic signature of the Mid-Paleocene subaerial exposure.