Errors in temperature are estimated subjectively, based on the quality of the equilibration record and the magnitude of the correction applied to the raw data. Errors in the depths of the measurements have not yet been taken into account. The reported gradients were calculated from linear regressions weighted proportional to the inverse of the squared error. Single-channel seismic line acquired over the Blake Ridge Diapir showing the location of Site 996. Note the highly reflective sediments in the center of the figure bounded above by a reversed polarity reflector interpreted as the base of hydrate stability.
Vertical scale is in seconds of two-way traveltime.
Detailed summary lithologic columns for Site 996 reflect the position of holes drilled into a small depression on the crest of the diapir. Subunits are indicated with arrows.