Figure F3. Downhole variations of grain size, textural statistical parameters, calcium carbonate, and magnetic susceptibility from (A) Hole 1249C and (B) Hole 1250C located at the summit of southern Hydrate Ridge. Lithostratigraphic units, main seismic horizons, and infrared (IR) thermal anomalies >1.7°C are also reported (after Shipboard Scientific Party, 2003a). (C) Downhole variations in bulk (calcite, clays, quartz, and feldspars) and clay (smectite, detrital mica, chlorite, and kaolinite) mineralogy from Hole 1250C. Semiquantitative analyses show changes or gradients in mineral abundances rather than absolute values. BSR = bottom simulating reflector.

Figure F3. Downhole variations of grain size, textural statistical parameters, calcium carbonate, and magnetic susceptibility from (A) Hole 1249C and (B) Hole 1250C located at the summit of southern Hydrate Ridge. Lithostratigraphic units, main seismic horizons, and infrared (IR) thermal anomalies >1.7°C are also reported (after Shipboard Scientific Party, 2003a). (C) Downhole variations in bulk (calcite, clays, quartz, and feldspars) and clay (smectite, detrital mica, chlorite, and kaolinite) mineralogy from Hole 1250C. Semiquantitative analyses show changes or gradients in mineral abundances rather than absolute values. BSR = bottom simulating reflector.