Six in situ temperature runs were made at this site: three APCT tool, two DVTPP, and one DVTP runs (Table T13; Fig. F30). APCT data were modeled using the software program TFIT (as described in "Downhole Tools and Pressure Coring" in the "Explanatory Notes" chapter) using measured thermal conductivities (see "Physical Properties"). The DVTP data were modeled using the software program CONEFIT. Temperatures for the DVTPP runs were measured directly from the data because the longer time taken for this measurement results in temperatures that appear to have reached equilibrium. Neither of the DVTPP time series shows the frictional pulse that is expected when the temperature probe is extracted, suggesting poor coupling to the sediment, and the deeper measurement shows an anomalous increase in temperature with time after the initial temperature decay. The shallowest APCT tool measurement shows an anomalous extraction pulse.
The resulting temperature estimates are given in Table T13 and shown in Figure F31. Excluding the deeper DVTPP measurement and the APCT tool measurement, the data suggest a temperature gradient of ~0.056°C/m and a depth to the base of the GHSZ of 130 mbsf. The apparent mismatch of ~20 m between the observed BSR depth of ~115 mbsf and the depth calculated from the temperature data, assuming a pure methane/seawater system, is similar to that observed at other sites.
No in situ pressure measurements were made at this site.
No pressure core sampler cores were taken at this site.
No HYACINTH pressure cores were taken at this site.