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The mineralogical composition of sediment samples from Sites U1325–U1329 is dominated by detrital minerals such as quartz, feldspar, and clay minerals, with quartz and feldspar dominating lithologic sections rich in turbidites. The calcite content, which is generally very low, increases within lithologic units containing high amounts of calcareous microfossils but never exceeds 5 wt%. Elevated calcite contents observed in some sections of the active venting Site U1328 correspond to the observed occurrence of authigenic carbonates. The data therefore represent primarily the detrital background sedimentation at the specific sites.