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Preliminary results in this paper concern 10 samples selected from mid-Cretaceous sediments from Leg 41, DSDP Site 370 off the Moroccan continental margin (northwest Africa). These samples originate from a subbottom depth of more than 835 meters. They represent interbeds of relatively coarse-grained lithified sediments including quartz-bearing calcirudites, calcarenites, and calcisiltites, in a sequence of predominantly silty and nanno-bearing shales of late Neocomian to lower Aptian age. The microfacies and microfabrics of the samples have been studied by optical and scanning electron microscope as well as by Xray diffraction, chemical, and staining methods. Different microfacies types (A-E) were distinguished according to specific composition. They are abundant, especially quartz, potassium feldspar, plagioclase, dolomite, and fragments of polygenetic rocks. Furthermore, the sediments include allochemical components that have originated in shallow-water environments. These components are mainly biogenic detritus, as well as oolites, superficially coated grains, and glauconite particles. Probably most of the coarse material was transported by turbidity currents from shelf and continental sources into the basin. The arenaceous sediments are well cemented grainstones in which up to three sequences of calcite cement can be differentiated.

Microfacies and Microfabrics of Early Middle Cretaceous Sediments Selected from Site 370, DSDP Leg 41 (Deep Basin off Morocco)