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The main objective of drilling Sites 370 (Leg 41) and 415 and 416 (Leg 50) was to obtain information about the early evolution of the Moroccan Basin. Diagenesis renders the interpretation of the depositional conditions of such sedimentary sequences difficult because it destroys indicators of the environment and causes the formation of new minerals and rocks. The investigation of these diagenetic features is aimed at the recognition of the original metastable primary materials and understanding the relationship between previous depositional environment and the present "diagenetic facies." We investigated the silica diagenesis in sediments of many North Atlantic DSDP holes (Legs 1-4, 10-12, 14, 41, 43, 47) with the aid of thin sections, smear slides, scanning electron microscopy, and X-ray diffractometry (von Rad and Rösch, 1974; von Rad et al., 1978; Riech and von Rad, in press; Riech, in press). The dissolution of biogenic opal is the prerequisite for the precipitation of opal-CT (= disordered low-temperature cristobalite-tridymite; Jones and Segnit, 1971) in porcellanites. The rate of transformation of these porcellanites into stable quartz cherts depends on the nature of the surrounding sediments (Lancelot, 1973; Kastner and Keene, 1975). The diagenetic changes of the source materials of silica and the processes leading to the formation of porcellanite are still poorly understood. Because coring was not continuous and we investigated only a small number of samples (25), we did not expect to find a continuity of diagenetic processes for the Moroccan Basin sites. In addition, the coring technique may have produced cores with an artificially condensed stratigraphic section and some sediments are probably displaced downward (younger sediments in older levels?)

Diagenesis of Siliceous Sediments, Porcellanites, and Cherts of the Moroccan Basin, Deep Sea Drilling Project Sites 370, 415, and 416