Figure F6. Plot of acetate ion and hydrogen concentration with depth for Site 1250. Hydrogen concentrations are noted by the format (number, letter) indicating the average concentration of that number of samples, while the letter designates the hole (e.g., [2,D] corresponds to Hole 1250D). The panel to the right is of the relative borehole resistivity as imaged by the resistivity-at-the-bit (RAB) tool. Lighter-colored bands represent areas of higher resistivity which are likely to be gas hydrate above the bottom-simulating reflector (BSR). The next panel shows low-temperature anomalies recorded by infrared camera scans (blue spikes), which indicate likely areas of gas hydrate decomposition in the recovered core. The graph on the far right plots the calculated percentage of pore space occupied by gas hydrate according to Tréhu et al. (2004). DeltaT = temperature change. SMI = sulfate/methane interface.

Figure F6. Plot of acetate ion and hydrogen concentration with depth for Site 1250. Hydrogen concentrations are noted by the format (number, letter) indicating the average concentration of that number of samples, while the letter designates the hole (e.g., [2,D] corresponds to Hole 1250D). The panel to the right is of the relative borehole resistivity as imaged by the resistivity-at-the-bit (RAB) tool. Lighter-colored bands represent areas of higher resistivity which are likely to be gas hydrate above the bottom-simulating reflector (BSR). The next panel shows low-temperature anomalies recorded by infrared camera scans (blue spikes), which indicate likely areas of gas hydrate decomposition in the recovered core. The graph on the far right plots the calculated percentage of pore space occupied by gas hydrate according to Tréhu et al. (2004).

T = temperature change. SMI = sulfate/methane interface.