Figure F22. Plot and core images of paleomagnetism evidence for advanced piston corer “rifling,” Hole U1404A. A. Declination trends measured in Core 342-U1404A-23H. Blue lines indicate expected directions for normal and reversed polarity declination in oriented cores. Thick red line emphasizes the downhole offset between expected and measured declination. B, C. Images of brittle shear fractures just above the sharp lithostratigraphic contact that are consistent with core deformation caused by a quickly rotating core barrel (interval 342-U1404A-23H-4, 117–122 cm).
Previous | Close | Next | Top of page