At Site 1132, in addition to routine monitoring of hydrocarbon gases for safety, analyses were conducted for inorganic carbon, total carbon, nitrogen, and sulfur. The analytical procedures are described in "Organic Geochemistry" in the "Explanatory Notes" chapter.
At Site 1132, concentrations of volatile hydrocarbons and hydrogen sulfide (H2S) were routinely determined in samples from Holes 1132B and 1132C using the standard Ocean Drilling Program headspace sampling procedure. As at Sites 1126, 1128, and 1130, only low concentrations of methane (C1) are present at Site 1132 (Table T3). Of the four sites, Site 1132 has the highest C1 content, with a maximum value of 54 ppm. Ethane (C2), at concentrations <5 ppm, was present between 53.8 and 249.4 mbsf. No heavier hydrocarbon gases (C3+) were detected. Unlike the other low-C1 sites, H2S, at low concentrations, was present at Site 1132 from 68.3 to 125.3 mbsf.
Calcium carbonate ranges from 85 to 95 wt% in Hole 1132B. Values are at the high end of the range near the sediment surface and decline gradually toward the lower end of the range with increasing depth (Table T4; Fig. F14A).
Organic carbon (Corg) ranges primarily from 0.2 to 0.6 wt% in Hole 1132B, with a few samples having higher or lower values (Table T4; Fig. F14). Values of Corg are scattered within this concentration range throughout Hole 1132B samples and exhibit no trend with depth (Fig. F14B).
Nitrogen concentrations are all <0.1 wt%. Sulfur is present in only eight samples, all from the upper 90 mbsf, at low concentrations (Table T4).