Preliminary investigation of diagenetic features in Mioccnc scdimcnts from ilrill core CRP-1. Victoria Land Basin (Antarctica) shows that carbonate precipitation and cementation occur in various lithologies. particularly in sand-rich portions. such as sandstones. siltstones and diamictites.

Carbonate diagenesis commonly occurs in association with shell material. It is represented by authigenic calcite and siderite. both of which precipitated from grain surfaces and formed rims within intraparticle cavities and voids of skeletal fragments. The carbonates itre often found closely related to cryptocrystalline concretions and framboidal crystals of pyritc. Carbonate precipitation and cementation in CRP-1 sediments seem to be controlled by selective dissolution of biogenic aragonitic skeletal tests and favourable conditions provided by organic matter