Figure F10. Textures and fractures observed in the basement, Hole C0012H. A. The irregular surface (i.e., nonplanar) at the sediment/basement interface (530.3 mbsf). B. Logging Subunit VIIA contains frequent variations in textural patterns (every 5 m or less), showing interpreted pillow basalt and thin sheet flow with subvertical fractures. C. Large, high-angle (~75°) low-resistivity (<7 Ωm) fracture bisecting a homogeneous sheet flow in logging Subunit VIIB. D. All three basement textures (mottled, turtleshell, and homogeneous zones) in logging Subunit VIIC. E. A sharp drop in resistivity marking the transition from a homogeneous zone to turtleshell texture at ~684 mbsf in logging Unit VIII, interpreted as the basal surface of a sheet flow. Several other (less distinct) surfaces are observed throughout both basement units. A and B are plotted on the medium range (0–10 Ωm) and C–E are plotted on the high range (2–50 Ωm) resistivity scale for static deep button resistivity.
Previous | Close | Next | Top of page