At Site 1133, in addition to routine monitoring of hydrocarbon gases for safety, inorganic carbon analyses were made. The analytical procedures are described in "Organic Geochemistry" in the "Explanatory Notes" chapter.
Concentrations of volatile hydrocarbons were routinely determined in every core from Holes 1133A and 1133B using standard ODP headspace sampling procedures. With the exception of two samples, only low concentrations of methane were detected; the maximum concentration was 170 ppm, with most samples having <12 ppm (Table T5). No heavier (C2+) hydrocarbon gases were detected.
Calcium carbonate content in Holes 1133A and 1133B ranges from 78.5 to 94.4 wt%; most samples have 85 to 92 wt% (Table T6; Fig. F12).
Organic carbon (Corg) is low at Site 1133. Concentrations of Corg are all <0.4 wt%, and about half the samples have <0.2 wt% (Table T6; Fig. F12).
Sulfur concentrations range as high as 0.36 wt%, with about half the samples having no detectable sulfur. Nitrogen is present in only five samples, and concentrations range from 0.05 to 0.20 wt%.