At Site 1117 the shipboard organic geochemistry consisted of determinations of TOC, inorganic carbon, total carbon, total nitrogen, and total sulfur in addition to the routine hydrocarbon gas safety monitoring procedure. The analytical techniques used are outlined in "Organic Geochemistry," in the "Explanatory Notes" chapter.
Only two headspace gas samples were collected at Site 1117. These contained methane at very low concentrations, 1.9 and 2.3 ppm at 1.5 (Core 180-1117A-1R) and 12.2 mbsf (Core 180-1117A-2R) respectively. No other hydrocarbons were detected.
The CaCO3 contents at Site 1117 ranged between 4.8 and 15.7 wt% (Table T7). Organic carbon was detected in only two samples at 1.35 and 3.88 mbsf in Core 180-1117A-1R and contained 0.12 and 0.23 wt% respectively. Sulfur only occurred in one sample (0.04 wt%, 1.35 mbsf; Table T7). Nitrogen was not detected in any of the samples.