The team also relogged the lowermost 50 m of the Leg 118 portion of the hole to provide a basis for comparison of the Leg 176 observations to those for the upper 500 m of the hole. The structural geologists marked all the Leg 176 cores for splitting orthogonal to the foliation. The cores were placed into the archive and working halves of split core liners in the same orientation to provide a consistent framework for description and measurement within the reference frame of the core liner. They are not geographically referenced. This unexpected result demonstrates that, overall, the foliations have a consistent orientation and thus can be reoriented into the geographical reference frame by making the assumption that the declination of the remnant magnetic vector dips toward the south.
Magmatic foliations vary in strike and dip, with no systematic variation with depth.
From the top of the core to 680 mbsf, the majority of the shear zones display normal shear. An example of a reverse shear zone is shown in Figure 19 . There are several interesting exceptions to this correlation, particularly in the lower portion of the hole, demonstrating that the relationship between the two may be complex in detail. This was addressed by a careful, independent assessment of 240 thin sections for the presence of crystal-plastic deformation and magmatic fabrics. Although weak magmatic fabrics are hard to see in thin section, undeformed samples with magmatic fabrics and the relative intensity of crystal-plastic fabric correlated remarkably well to the macroscopic observations of the core.